Updated through March 2023.
Utility companies and grid operators are required to submit reports on electric disturbance events to the Department of Energy (DOE) on a form known as an OE-417. The publicly available information from these reports is difficult to find, incomplete and confusing. For a detailed description of OE-417s and the reporting criteria, CLICK HERE.
I did an analysis of all the publicly available OE-417 data from January 1, 2010 through the present. (I started in 2010 because that is when the NERC CIP Coverup began.) First of all, there were 166 different “event types” reported many of which were either duplicates or related. For example, there were at least 24 different “event types” that denoted a physical attack. There were at least 50 “event types” that denoted a disturbance caused by weather. I grouped these 166 “event types” into 15 categories (actually “causes”) so that we could get a sense of what has actually threatened the electric grid in the past 10 years.
Unfortunately, the public OE-417 data is so bad that there were 752 electric disturbance events where I was unable to identify a cause. These are highlighted in yellow in the chart. I was able to identify a cause in 2459 electric disturbance events, or 80% of the OE-417 reports filed. Moreover, some data such as the number of “customers affected” does not appear accurate in some cases. Many OE-417’s do not appear to be updated. Reports from years ago show “unknown” under the number of customers affected, or show “0” when we know there were blackouts associated with those events.
Note: After the Texas Grid Collapse of 2021, I started breaking out separate charts for the TRE Region (Texas Reliability Entity a.k.a. Texas RE) in order to give the public better access to what has caused electric disturbances in Texas.
Here is another view of the data by year. Electric disturbance events where I was unable to identify a cause are highlighted in yellow in the chart:
In the below OE-417 Quick Reference Database and CSV file, I added the column “Category” in order to consolidate “Event Types” for statistical purposes. All other data is from Department of Energy (DOE) OE-417 annual summaries.
To Download a CSV file with all columns, Click HERE.
| Data | Date Event Began | Time Event Began | Date of Restoration | Time of Restoration | Area Affected | NERC Region | Alert Criteria | Event Type | Demand Loss (MW) | Number of Customers Affected | Category |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2010-01-06 | 6:00 p.m. | 6:00 p.m. January 08 | Southwest Louisiana | SERC | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-01-11 | 3:45 a.m. | 9:57 a.m. January 11 | Northern and Central Florida | FRCC/SERC | Interruptible Load Shed/Made Public Appeals | N/A | N/A | Load Shed | |||
| 2010-01-18 | 11:30 a.m. | 8:00 a.m. January 28 | Northern and Central California | WECC | Severe Storm | 290 | 1,700,000 | Weather | |||
| 2010-01-19 | 7:30 a.m. | 12:24 p.m. January 19 | San Francisco | WECC | Severe Storm | 300 | 30,000 | Weather | |||
| 2010-01-19 | 2:30 p.m. | 3:00 p.m. January 20 | San Diego and Orange Counties | WECC | Severe Storm | 2,650 | 50,000 | Weather | |||
| 2010-01-20 | 1:00 p.m. | 6:10 p.m. January 24 | City of Los Angeles, California | WECC | Severe Storm | N/A | 147,223 | Weather | |||
| 2010-01-28 | 12:00 p.m. | 12:00 p.m. February 02 | Oklahoma | SPP | Ice Storm | N/A | 68,705 | Weather | |||
| 2010-02-01 | 2:32 p.m. | 5:00 p.m. February 01 | Oklahoma | SPP | Ice Storm/Electrical System Separation | 30 | 0 | Weather | |||
| 2010-02-05 | 10:30 p.m. | 12:00 p.m. February 12 | Southwestern Pennsylvania | RFC | Winter Storm | N/A | 57,000 | Weather | |||
| 2010-02-05 | 6:48 p.m. | 5:00 p.m. February 07 | North and South Carolina | SERC | Winter Storm | 500 | 74,000 | Weather | |||
| 2010-02-05 | 7:00 p.m. | 3:46 p.m. February 12 | District of Columbia, Prince Georges and Montgomery Co. MD | RFC | Winter Storm | N/A | 97,651 | Weather | |||
| 2010-02-05 | 11:30 p.m. | 2:38 a.m. February 07 | Indiana, Ohio, W. Virginia and Virginia | RFC | Winter Storm | N/A | 102,225 | Weather | |||
| 2010-02-05 | 3:00 p.m. | 4:00 p.m. February 13 | Southern NJ | RFC | Winter Storm | N/A | 221,000 | Weather | |||
| 2010-02-06 | 8:00 a.m. | 9:00 a.m. February 06 | Delmarva Peninsula | RFC | Winter Storm | N/A | 58,491 | Weather | |||
| 2010-02-06 | 2:30 a.m. | 7:00 a.m. February 07 | Virginia, North Carolina | SERC | Winter Storm | 600 | 104,736 | Weather | |||
| 2010-02-09 | 6:00 p.m. | 4:00 p.m. February 14 | Southeastern Pennsylvania | RFC | Winter Storm | N/A | 223,000 | Weather | |||
| 2010-02-11 | 12:00 p.m. | 9:00 p.m. February 15 | Dallas/Fort Worth and East Texas | TRE | Winter Storm | N/A | 500,000 | Weather | |||
| 2010-02-12 | 5:00 a.m. | 5:00 p.m. February 12 | East Texas, Western Arkansas, Northern Lousiania | SPP | Winter Storm | N/A | 52,999 | Weather | |||
| 2010-02-14 | 10:00 a.m. | 12:00 p.m. February 14 | Western Pennsylvania nd Northeast Central WV | RFC | Winter Storm | 900 | 190,000 | Weather | |||
| 2010-02-19 | 8:30 p.m. | 4:01 a.m. February 20 | San Joaquin Field Division/Bakersfield, CA | WECC | Firm System Load Shed | 1,000 | N/A | Load Shed | |||
| 2010-02-23 | 10:00 p.m. | 4:00 p.m. February 25 | Upstate New York | NPCC | Winter Storm | N/A | 150,000 | Weather | |||
| 2010-02-25 | 5:00 p.m. | 7:00 p.m. March 02 | New York City | NPCC | Winter Storm | N/A | 55,000 | Weather | |||
| 2010-02-25 | 12:01 a.m. | 9:00 p.m. February 26 | Southeastern New York, Northern New Jersey | NPCC | Winter Storm | N/A | 65,000 | Weather | |||
| 2010-02-25 | 11:53 p.m. | 4:40 p.m. March 01 | Southern Maine and New Hampshire | NPCC | Winter Storm | 510 | 509,606 | Weather | |||
| 2010-03-13 | 12:00 p.m. | 8:05 p.m. March 15 | Connecticut | NPCC | High Winds and Rain | 50 | 50,246 | Weather | |||
| 2010-03-13 | 3:00 p.m. | 4:00 p.m. March 17 | Long Island | NPCC | High Winds and Rain | N/A | 153,000 | Weather | |||
| 2010-03-13 | 6:00 p.m. | 9:00 a.m. March 20 | New York City and Westchester County | NPCC | High Winds and Rain | N/A | 173,000 | Weather | |||
| 2010-03-13 | 1:00 a.m. | 6:40 p.m. March 16 | Southeasten Pennsylvania | RFC | High Winds and rain | N/A | 177,528 | Weather | |||
| 2010-03-13 | 4:00 p.m. | 12:00 a.m. March 16 | Central New Jersey and Northern New Jersey | RFC | High Winds and Flooding | N/A | 180,000 | Weather | |||
| 2010-03-13 | 6:00 p.m. | 12:59 p.m. March 20 | Southern, Central and Northern New Jersey | RFC | High Winds and Rain | 100 | 360,000 | Weather | |||
| 2010-03-31 | 11:59 p.m. | 12:55 a.m. April 01 | San Diego and Orange Counties | WECC | Shed Firm Load | 324 | 290,000 | Load Shed | |||
| 2010-03-31 | 11:59 p.m. | 12:38 a.m. April 01 | San Diego | WECC | Shed Firm Load | 324 | N/A | Load Shed | |||
| 2010-04-16 | 5:15 p.m. | 5:00 p.m. April 18 | Southwestern Pennsylvania | RFC | Severe Thunderstorms | 15 | 120,000 | Weather | |||
| 2010-04-21 | 3:05 p.m. | 8:00 p.m. April 21 | Iberville, Parish, Louisiana | SERC | Generator Tripped | N/A | N/A | Equipment | |||
| 2010-04-27 | 2:55 p.m. | 2:55 p.m. April 27 | Rocky Mount, NC | SERC | Transmission System Interruption | N/A | 29,376 | Transmission Interruption | |||
| 2010-05-02 | 2:40 p.m. | 7:30 p.m. May 09 | Tennessee and Mississippi | SERC | Thunderstorms | N/A | 50,500 | Weather | |||
| 2010-05-18 | 8:15 a.m. | 10:46 p.m. May 18 | Central California | WECC | Breakers Tripped | 318 | N/A | Equipment | |||
| 2010-05-26 | 11:45 a.m. | 3:00 p.m. May 26 | Maryland, Pennsylvania, West Virginia, Virginia | RFC, SERC | Made Public Appeal - System Drill | N/A | N/A | Public Appeal | |||
| 2010-06-01 | 10:03 p.m. | 12:30 a.m. June 18 | Southwestern Indiana | RFC | Firm Load Shed | 500 | 1 | Load Shed | |||
| 2010-06-02 | 8:18 p.m. | 8:00 a.m. June 04 | San Antonio, TX | TRE | Severe Weather | N/A | 126,000 | Weather | |||
| 2010-06-06 | 4:45 a.m. | 5:35 a.m. June 06 | Northern California | WECC | Electric System Separation | 3 | 2,650 | Islanding | |||
| 2010-06-07 | 6:29 p.m. | 1:00 a.m. June 08 | Denver Metropolitan Area | WECC | Firm Load Shed | 300 | 31,000 | Load Shed | |||
| 2010-06-08 | 11:00 a.m. | 5:00 p.m. June 08 | Southeastern Texas | TRE | Thunderstorms | N/A | 79,741 | Weather | |||
| 2010-06-09 | 2:18 p.m. | 3:00 p.m. June 09 | Edenton, NC | SERC | Transmission System Interruption | N/A | 4,196 | Transmission Interruption | |||
| 2010-06-16 | 11:11 a.m. | 11:32 a.m. June 16 | New York (Rockland and Orange Counties) | NPCC | Voltage Reduction (System Test) | N/A | N/A | ? | |||
| 2010-06-17 | 10:49 a.m. | 11:02 a.m. June 17 | Eastern Montana | MRO | Electrical System Separation | N/A | N/A | Islanding | |||
| 2010-06-17 | 8:30 a.m. | 5:47 p.m. June 17 | Morgan City, LA | SPP | Made Public Appeal | N/A | N/A | Public Appeal | |||
| 2010-06-17 | 9:30 a.m. | 5:17 p.m. June 17 | Southern Louisiana | SERC | Made Public Appeal | N/A | N/A | Public Appeal | |||
| 2010-06-17 | 9:30 a.m. | 4:40 p.m. June 17 | Southern Louisiana | SERC | Made Public Appeal | N/A | N/A | Public Appeal | |||
| 2010-06-17 | 9:30 a.m. | 4:40 p.m. June 17 | Southwestern Louisiana | SPP | Made Public Appeal | N/A | N/A | Public Appeal | |||
| 2010-06-18 | 8:00 p.m. | 10:45 a.m. June 21 | Indiana, Michigan | RFC | Severe Weather | N/A | 79,000 | Weather | |||
| 2010-06-18 | 3:30 p.m. | 12:30 a.m. June 20 | Northwest Indiana | RFC | Thunderstorms | N/A | 94,345 | Weather | |||
| 2010-06-18 | 7:00 p.m. | 5:00 a.m. June 19 | Southern Portion of Lower Michigan | RFC | Thunderstorms | N/A | 100,000 | Weather | |||
| 2010-06-18 | 8:00 p.m. | 7:30 p.m. June 22 | Detroit, MI | RFC | Severe Weather | N/A | 150,000 | Weather | |||
| 2010-06-18 | 4:00 p.m. | 1:00 p.m. June 20 | Chicago, IL | RFC | Severe Weather | N/A | 400,000 | Weather | |||
| 2010-06-21 | 1:48 p.m. | 8:31 p.m. June 22 | Cincinnati, OH | RFC | Thunderstorms | 400 | 50,636 | Weather | |||
| 2010-06-22 | 3:34 p.m. | 7:00 p.m. June 22 | West/Central Arkansas | SERC | Made Public Appeal/Transmission Equipment Failure | 84 | 25,159 | Transmission Interruption | |||
| 2010-06-23 | 5:48 p.m. | 2:21 a.m. June 24 | Northwest Indiana | RFC | Thunderstorms | N/A | 53,000 | Weather | |||
| 2010-06-23 | 5:00 p.m. | 1:40 p.m. June 25 | Chicago, IL | RFC | Severe Weather | N/A | 300,000 | Weather | |||
| 2010-06-24 | 3:00 p.m. | 12:00 p.m. June 29 | Southwestern New Jersey | RFC | Thunderstorms | N/A | 150,000 | Weather | |||
| 2010-06-24 | 3:30 p.m. | 11:59 p.m. June 29 | Southeastern Pennsylvania | RFC | Thunderstorms | N/A | 355,000 | Weather | |||
| 2010-06-25 | 11:36 p.m. | 1:38 a.m. June 26 | Northern California | WECC | Electrical System Separation | N/A | N/A | Islanding | |||
| 2010-07-06 | 3:47 a.m. | 4:37 a.m. July 06 | Newark, DE | RFC | Transformer Outage | 95 | 18,400 | Equipment | |||
| 2010-07-07 | 4:13 p.m. | 10:29 p.m. July 07 | York, South Central Pennsylvania | RFC | Loss of Transmission Equipment | N/A | 43,903 | Transmission Interruption | |||
| 2010-07-15 | 7:00 p.m. | 11:30 p.m. July 19 | Southeastern Michigan | RFC | Severe Weather | 540 | 127,534 | Weather | |||
| 2010-07-17 | 8:30 p.m. | 10:00 p.m. July 19 | Minnesota | MRO | Strong Winds, Tornadoes | N/A | 63,000 | Weather | |||
| 2010-07-21 | 6:44 p.m. | 8:00 p.m. July 21 | Connecticut | NPCC | Thunderstorms | N/A | 50,100 | Weather | |||
| 2010-07-23 | 10:00 a.m. | 11:55 p.m. July 24 | Northern Utah | WECC | Made Public Appeals | 8-Jun | N/A | Public Appeal | |||
| 2010-07-23 | 7:30 p.m. | 6:30 p.m. July 26 | Southeastern Michigan | RFC | Severe Weather | 400 | 82,000 | Weather | |||
| 2010-07-25 | 4:11 p.m. | 8:06 p.m. July 25 | Northern Virginia | SERC | Severe Weather | 900-1000 | 81,000 | Weather | |||
| 2010-07-25 | 3:20 p.m. | 6:00 p.m. July 27 | Central Maryland | RFC | Severe Weather | 480 | 124,000 | Weather | |||
| 2010-07-25 | 3:10 p.m. | 11:30 p.m. July 30 | Washington, DC Region | RFC | Severe Weather | N/A | 297,700 | Weather | |||
| 2010-07-29 | 5:43 p.m. | 8:07 p.m. July 29 | Virginia | SERC | Thunderstorms | N/A | 55,000 | Weather | |||
| 2010-07-29 | 6:39 p.m. | 7:26 p.m. July 29 | Southern California | WECC | Shed Interruptible Load, Wildfire | 522 | N/A | Wildfire | |||
| 2010-07-29 | 6:39 p.m. | 7:26 p.m. July 29 | Southern California | WECC | Shed Interruptible Load, Wildfire | 522 | N/A | Wildfire | |||
| 2010-08-02 | 12:00 p.m. | 11:00 p.m. August 02 | Central California | WECC | Fuel Supply Deficiency (Hydro) | N/A | N/A | Fuel Supply Deficiency | |||
| 2010-08-02 | 12:45 p.m. | 11:00 a.m. August 04 | Southern Louisiana | SERC | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-08-02 | 12:45 p.m. | 11:00 a.m. August 04 | Southern Louisiana | SERC | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-08-02 | 12:45 p.m. | 11:00 a.m. August 04 | Southwestern Louisiana | SERC | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-08-02 | 12:45 p.m. | 11:00 a.m. August 04 | Southern Louisiana | SPP | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-08-04 | 12:00 p.m. | 10:00 p.m. August 04 | Northern Texas, Eastern New Mexico | SPP | Made Public Appeals | N/A | N/A | Public Appeal | |||
| 2010-08-04 | 4:45 p.m. | 12:00 a.m. August 07 | Western Pennsylvania, Northwestern and Central West Virginia | RFC | Thunderstorms | 60 | 11,186 | Weather | |||
| 2010-08-04 | 5:00 p.m. | 4:00 a.m. August 06 | Ohio, West Virginia, Kentucky | RFC | Severe Weather | N/A | 37,000 | Weather | |||
| 2010-08-05 | 3:30 p.m. | 10:00 p.m. August 05 | District of Columbia, Maryland | RFC | Thunderstorms | N/A | 76,729 | Weather | |||
| 2010-08-05 | 3:54 p.m. | 12:00 a.m. August 08 | Northern Virginia | RFC | Thunderstorms | N/A | 145,157 | Weather | |||
| 2010-08-09 | 12:00 p.m. | 12:00 p.m. August 16 | Upstate New York | RFC | Fuel Supply Defiency | N/A | N/A | Fuel Supply Deficiency | |||
| 2010-08-11 | 3:21 p.m. | 12:12 p.m. August 11 | Ohio | RFC | Severe Weather | N/A | 57,000 | Weather | |||
| 2010-08-12 | 3:42 p.m. | 10:10 p.m. August 12 | City of Oshkosh, Wisconsin | MRO | Made Public Appeals | 30 | 7,600 | Public Appeal | |||
| 2010-08-12 | 8:21 a.m. | 11:00 a.m. August 12 | Central Nebraska | SPP | Made Public Appeals | 65 | N/A | Public Appeal | |||
| 2010-08-12 | 6:45 a.m. | 9:00 p.m. August 12 | District of Columbia, Maryland | RFC | Severe Weather | N/A | 101,003 | Weather | |||
| 2010-08-19 | 6:00 p.m. | 3:30 p.m. August 23 | Southeastern Michigan | RFC | Severe Weather | 340 | 80,000 | Weather | |||
| 2010-08-23 | 5:50 p.m. | 9:30 a.m. August 24 | Houston, Texas | TRE | Severe Weather | 746 | 81,586 | Weather | |||
| 2010-09-01 | 10:20 a.m. | 12:44 p.m. September 01 | Pittsburg (Bay Area), California | WECC | Electrical System Separation (Islanding) | 31 | 15,000 | Islanding | |||
| 2010-09-07 | 2:02 p.m. | 1:27 a.m. September 08 | San Antonio, Texas | TRE | Tropical Storm | N/A | 340,350 | Weather | |||
| 2010-09-20 | 5:00 p.m. | 5:30 p.m. September 20 | King George County, Virginia | SERC | Low Flying Helicopter | N/A | N/A | ? | |||
| 2010-09-21 | 9:31 p.m. | 2:30 p.m. September 22 | Central and Southern Michigan | RFC | Thunderstorms | N/A | 138,000 | Weather | |||
| 2010-09-22 | 6:12 a.m. | 11:00 p.m. September 22 | Bakersfield, California | WECC | Firm Load Shed | 526 | N/A | Load Shed | |||
| 2010-09-22 | 4:08 p.m. | 12:00 a.m. September 26 | City of Pittsburgh, Pennsylvania | RFC | Thunderstorms | 156 | 52,000 | Weather | |||
| 2010-09-22 | 5:38 p.m. | 11:30 p.m. September 24 | Western Pennsylvania | RFC | Thunderstorms | 389 | 82,861 | Weather | |||
| 2010-09-27 | 3:15 p.m. | 6:12 p.m. September 27 | Central and Southern California | WECC | Interruptible Load Shed | 595 | N/A | Load Shed | |||
| 2010-10-05 | 5:45 a.m. | 6:00a.m. October 07 | City of Los Angeles, California | WECC | Rain and High Winds | N/A | 73,514 | Weather | |||
| 2010-10-26 | 8:00 p.m. | 10:00 p.m. October 28 | Minnesota | MRO | High Winds | N/A | 70,000 | Weather | |||
| 2010-10-26 | 9:00 a.m. | 11:00 a.m. October 28 | Northern Illinois | RFC | Thunderstorms | N/A | 192,106 | Weather | |||
| 2010-10-27 | 5:16 p.m. | 5:27 p.m. October 27 | Northern California | WECC | Electrical System Separation-Islanding | 16 | 2,674 | Islanding | |||
| 2010-10-27 | 4:00 a.m. | 12:00 p.m. October 27 | Northeast and North Central Wisconsin | MRO | High Winds | N/A | 63,000 | Weather | |||
| 2010-10-27 | 5:00 p.m. | 4:00 a.m. October 29 | Northern Illinois | RFC | High Winds | N/A | 127,000 | Weather | |||
| 2010-10-27 | 8:00 a.m. | 7:00 a.m. October 29 | Michigan's Northerly Lower Peninsula | RFC | High Winds | 240 | 285,000 | Weather | |||
| 2010-10-31 | 10:26 p.m. | 1:45 a.m. November 01 | Bakersfield, California | WECC | Firm System Load Loss | 500 | N/A | Load Shed | |||
| 2010-11-04 | 9:46 a.m. | 10:47 a.m. November 04 | Rock Springs, Wyoming | WECC | Transmission Equipment Failure/Interruptible Load Shed | N/A | N/A | Transmission Interruption | |||
| 2010-11-06 | 3:53 p.m. | 6:08 p.m. November 06 | Northern California | WECC | Electrical System Separation - Islanding | 20 | 4 | Islanding | |||
| 2010-11-08 | 6:47 a.m. | 6:00 p.m. November 08 | Maine | NPCC | Snow and High Winds | N/A | 60,863 | Weather | |||
| 2010-11-13 | 3:00 p.m. | 10:00 p.m. November 14 | Minnesota | MRO | Winter Storm | N/A | 60,000 | Weather | |||
| 2010-11-15 | 11:00 p.m. | 2:14 a.m. November 16 | Puget Sound Region | WECC | High Winds | 391 | 149,256 | Weather | |||
| 2010-11-21 | 1:39 a.m. | 4:46 p.m. November 24 | Northern and Central California | WECC | Winter Storm | 75 | 60,000 | Weather | |||
| 2010-11-22 | 11:00 p.m. | 8:00 p.m. November 24 | Puget Sound Region, Washington | WECC | Winter Storm | 420 | 123,535 | Weather | |||
| 2010-11-23 | 2:01 p.m. | 6:12 p.m. November 23 | Northern California | WECC | Electrical System Separation - Islanding | 22 | 7,077 | Islanding | |||
| 2010-12-03 | 9:32 p.m. | 2:00 a.m. December 04 | California | WECC | Electrical System Separation - Islanding | 22 | 7,077 | Islanding | |||
| 2010-12-12 | 4:30 p.m. | 2:00 p.m. December 15 | Southeastern Michigan | RFC | Severe Weather | 210 | 60,175 | Weather | |||
| 2010-12-14 | 7:20 a.m. | 7:25 a.m. December 14 | California | WECC | Electrical System Separation - Islanding | 9 | 6,635 | Islanding | |||
| 2010-12-14 | 7:36 a.m. | 9:00 a.m. December 15 | Southern California | WECC | Transmission Equipment/Firm System Load | 464 | N/A | Load Shed | |||
| 2010-12-18 | 5:00 a.m. | 10:00 p.m. December 19 | Redmond, Washington | WECC | Severe Weather | 184 | 92,090 | Weather | |||
| 2010-12-26 | 8:15 a.m. | 4:15 p.m. December 26 | Carolina | SERC | Severe Weather | N/A | 42,000 | Weather | |||
| 2010-12-30 | 2:00 p.m. | 6:00 a.m. January 12 | New York | RFC | Fuel Supply Deficiency | 300 | N/A | Fuel Supply Deficiency | |||
| 2011-01-12 | 6:00 AM | 1/12/2011 | 2:00 PM | Massachusetts | NPCC | Winter Storm | N/A | 80,000 | Weather | ||
| 2011-01-13 | 7:21 AM | 1/13/2011 | 8:13 AM | North Florida | FRCC | Firm System Load Shed | 150 | 20,900 | Load Shed | ||
| 2011-01-18 | 2:00 PM | 1/18/2011 | 2:00 PM | Whitman, Auburn St Substation, Massachusetts | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-01-23 | 7:00 AM | 1/23/2011 | 1:00 PM | Franklin County, Idaho | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-01-24 | 1:20 PM | 1/24/2011 | 1:30 PM | Newman Power Plant, Texas | WECC | Suspicious Activity | 0 | 0 | Physical Attack | ||
| 2011-01-25 | 3:23 AM | 1/25/2011 | 11:00 AM | Newark, Delaware | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-01-26 | 9:25 AM | 1/27/2011 | 5:00 PM | Carson City, Nevada | WECC | Suspected Telecommunications Attack | 0 | 0 | Cyber Attack | ||
| 2011-01-26 | 9:33 AM | 1/27/2011 | 3:03 PM | Michigan | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-01-26 | 7:43 PM | 1/27/2011 | 6:18 PM | Northern Virginia | SERC | Winter Storm | 600 | 150,084 | Weather | ||
| 2011-01-26 | 5:00 PM | 1/31/2011 | 8:00 AM | Montgomery and Prince George's County, Maryland and District of Columbia | RFC | Winter Storm | N/A | 210,000 | Weather | ||
| 2011-01-26 | 6:28 PM | 1/29/2011 | 5:00 PM | Maryland | RFC | Winter Storm | N/A | 234,326 | Weather | ||
| 2011-01-27 | 5:00 PM | 1/30/2011 | 5:00 AM | Central New York | NPCC | Fuel Supply Deficiency (Coal) | 108 | N/A | Fuel Supply Deficiency | ||
| 2011-01-27 | 9:30 AM | 1/27/2011 | 9:30 AM | Hockessin, Delaware | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-01-31 | 10:00 PM | 2/3/2011 | 12:00 PM | Southwestern Ohio and Indiana | RFC | Ice Storm | 996 | 272,880 | Weather | ||
| 2011-02-01 | 3:00 PM | 2/3/2011 | 12:00 PM | Indiana, Ohio | RFC | Winter Storm | UNK | 158,013 | Weather | ||
| 2011-02-02 | 5:00 PM | 2/3/2011 | 10:00 PM | Texas Panhandle, Southeastern New Mexico | SPP | Fuel Supply Deficiency (Natural Gas) | UNK | UNK | Fuel Supply Deficiency | ||
| 2011-02-02 | 6:22 AM | 2/2/2011 | 9:57 AM | Central Arizona | WECC | Generation Inadequacy/Load Shed | 3,963 | 69,000 | Generation Interruption | ||
| 2011-02-02 | 7:24 AM | 2/2/2011 | 10:23 PM | Dona Ana and El Paso Counties, Texas and Hudspeth County, New Mexico | WECC | Generation Inadequacy/Load Shed | 280 | 178,000 | Generation Interruption | ||
| 2011-02-02 | 5:43 AM | 2/3/2011 | 10:00 AM | Texas | TRE | Generation Inadequacy/Load Shed | 4,000 | 1,069,730 | Generation Interruption | ||
| 2011-02-02 | 3:00 AM | 2/4/2011 | 11:59 PM | Philadelphia area, Pennsylvania | RFC | Winter Storm | UNK | 213,000 | Weather | ||
| 2011-02-03 | 2:30 PM | 2/3/2011 | 2:30 PM | Bowie, Maryland | RFC | Suspected Cyber Attack | N/A | 0 | Cyber Attack | ||
| 2011-02-03 | 3:00 PM | 2/4/2011 | 12:00 PM | San Diego area, California | WECC | Fuel Supply Deficiency (Natural Gas) | N/A | UNK | Fuel Supply Deficiency | ||
| 2011-02-03 | 10:04 PM | 2/4/2011 | 12:32 PM | Texas | TRE | Generation Inadequacy/Load Shed | 400 | 86,013 | Generation Interruption | ||
| 2011-02-09 | 2:54 PM | 2/9/2011 | 5:00 PM | University Place, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-02-09 | 3:45 AM | 2/9/2011 | 9:12 AM | Western Houston, Texas | TRE | Winter Storm | 399 | 60,000 | Weather | ||
| 2011-02-09 | 4:30 PM | 2/10/2011 | 12:33 PM | Texas | TRE | Cold Weather Event | N/A | N/A | Weather | ||
| 2011-02-10 | 1:00 PM | 2/10/2011 | 1:00 PM | LaGrande, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-02-17 | 1:00 PM | 2/23/2011 | 4:53 PM | Roseville, California | WECC | Suspected Cyber Attack | 0 | 0 | Cyber Attack | ||
| 2011-02-17 | 1:25 AM | 2/19/2011 | 10:13 AM | Northern and Central California | WECC | Major Storm | 91 | 80,000 | Weather | ||
| 2011-02-19 | 4:34 PM | 2/19/2011 | 4:34 PM | Harrington, Delaware | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-02-19 | 12:30 PM | 2/20/2011 | 4:00 AM | Philadelphia area, Pennsylvania | RFC | Major Storm | UNK | 118,000 | Weather | ||
| 2011-02-20 | 4:00 PM | 2/23/2011 | 4:00 PM | Southern Lower Peninsula, Michigan | RFC | Winter Storm | 262 | 160,000 | Weather | ||
| 2011-02-24 | 4:51 PM | 2/24/2011 | 4:54 PM | Arkansas | SPP | Electrical System Separation (Islanding) | 4 | UNK | Islanding | ||
| 2011-02-25 | 10:30 AM | 2/25/2011 | 10:45 AM | Salt Lake City, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-02-25 | 3:20 PM | 2/25/2011 | 6:00 PM | Virginia | SERC | Severe Weather | UNK | 50,000 | Weather | ||
| 2011-02-25 | 8:00 AM | 2/28/2011 | 5:30 PM | Northern and Central California | WECC | Winter Storm | 91 | 80,000 | Weather | ||
| 2011-02-25 | 3:23 PM | 2/27/2011 | 6:00 PM | Maryland | RFC | Severe Weather | UNK | 93,000 | Weather | ||
| 2011-03-01 | 8:00 AM | 3/5/2011 | 9:30 AM | Western New York | NPCC | Fuel Supply Deficiency (Coal) | 675 | UNK | Fuel Supply Deficiency | ||
| 2011-03-06 | 2:54 AM | 3/8/2011 | 8:00 AM | Salt Lake City Region, Utah | WECC | Vandalism | UNK | 0 | Physical Attack | ||
| 2011-03-10 | 12:03 PM | 3/11/2011 | 6:00 AM | Texas | TRE | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-03-11 | 7:02 AM | 3/11/2011 | 9:15 AM | Humboldt and Eureka, California | WECC | Generation Inadequacy/Load Shed | 15 | 6,800 | Generation Interruption | ||
| 2011-03-13 | 2:20 PM | 3/14/2011 | 3:46 PM | Oregon | WECC | Severe Weather | UNK | 9,000 | Weather | ||
| 2011-03-14 | 7:30 AM | 3/14/2011 | 4:55 PM | Baltimore, Maryland | RFC | Suspected Cyber Attack | N/A | N/A | Cyber Attack | ||
| 2011-03-15 | 6:00 PM | 3/15/2011 | 7:14 PM | The Woodlands, Texas | TRE | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-03-17 | 7:40 AM | 3/17/2011 | 11:00 AM | Deerfield, New Hampshire | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-03-18 | 9:54 AM | 3/18/2011 | 3:34 PM | Greene County, Ohio | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-03-19 | 11:56 PM | 3/24/2011 | 7:10 PM | Northern and Central California | WECC | Major Storm | 91 | 128,000 | Weather | ||
| 2011-03-20 | 9:44 AM | 3/21/2011 | 10:00 AM | Los Angeles, California | WECC | Major Storm | UNK | 79,000 | Weather | ||
| 2011-03-21 | 12:57 AM | 3/21/2011 | 2:29 AM | Deerfield, New Hampshire | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-03-21 | 12:35 PM | 3/21/2011 | 2:45 PM | Southern California | WECC | Major Storm | 150 | 54,332 | Weather | ||
| 2011-03-23 | 6:30 PM | 3/24/2011 | 4:55 AM | Indiana. Kentucky, Michigan, Ohio, Tennessee, Virginia, West Virginia | RFC | Major Storm | UNK | 60,596 | Weather | ||
| 2011-03-27 | 1:27 PM | 3/27/2011 | 5:00 PM | Sonoma and Central Valley, California | WECC | Transmission Level Outage | 295 | 165,000 | Transmission Interruption | ||
| 2011-03-31 | 2:30 PM | 4/1/2011 | 11:59 PM | Central and Western Florida | FRCC | Severe Weather | UNK | 50,000 | Weather | ||
| 2011-03-31 | 11:30 AM | 3/31/2011 | 8:30 PM | Greater Tampa Bay, Florida | FRCC | Severe Weather | 206 | 87,000 | Weather | ||
| 2011-04-03 | 8:23 PM | 4/5/2011 | 3:00 PM | Unknown | SERC | Suspected Cyber Attack | 0 | 0 | Cyber Attack | ||
| 2011-04-04 | 7:00 PM | 4/5/2011 | 12:00 PM | Kentucky, West Virginia | RFC | Severe Weather | UNK | 52,920 | Weather | ||
| 2011-04-04 | 11:47 AM | 4/8/2011 | 12:01 AM | Memphis, Tennessee | SERC | Severe Weather | 359 | 63,000 | Weather | ||
| 2011-04-04 | 1:00 PM | 4/5/2011 | 12:00 AM | Shelby County, Tennessee | SERC | Severe Weather | 300 | 63,000 | Weather | ||
| 2011-04-04 | 7:00 PM | 4/5/2011 | 8:00 PM | Southeast Arkansas, Southeast Louisiana, Western Mississippi, Eastern Texas | SERC | Severe Weather | UNK | 74,645 | Weather | ||
| 2011-04-04 | 9:00 PM | 4/5/2011 | 11:30 PM | Alabama, Florida, Georgia, Mississippi | SERC | Severe Weather | 674 | 303,434 | Weather | ||
| 2011-04-05 | 2:00 AM | 4/7/2011 | 11:00 PM | North Carolina, South Carolina | SERC | Severe Weather | 1,200 | 256,000 | Weather | ||
| 2011-04-06 | 10:50 AM | 4/6/2011 | 10:50 AM | Felton, Delaware | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-04-11 | 5:40 PM | 4/11/2011 | 5:51 PM | Salt Lake City, Utah | WECC | Suspicious Activity | 0 | 0 | Physical Attack | ||
| 2011-04-16 | 2:16 PM | 4/17/2011 | 4:30 PM | Central and Eastern North Carolina | SERC | Severe Weather | UNK | 220,000 | Weather | ||
| 2011-04-19 | 2:01 PM | 4/19/2011 | 4:04 PM | Graham, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-04-19 | 10:44 PM | 4/20/2011 | 2:00 AM | Memphis, Tennessee | SERC | Severe Weather | 100 | 64,000 | Weather | ||
| 2011-04-19 | 8:00 PM | 4/19/2011 | 10:00 PM | Illinois | SERC | Severe Weather | UNK | 80,000 | Weather | ||
| 2011-04-19 | 11:02 PM | 4/21/2011 | 5:32 PM | Memphis, Tennessee | SERC | Severe Weather | 300 | 105,000 | Weather | ||
| 2011-04-19 | 11:13 PM | 4/20/2011 | 7:14 PM | Osceola, Arkansas | SERC | Severe Weather | 22 | UNK | Weather | ||
| 2011-04-20 | 8:07 AM | 4/20/2011 | 8:14 AM | Ruston, Louisiana | SERC | Equipment Malfunction | 33 | 11,000 | Equipment | ||
| 2011-04-20 | 2:00 AM | 4/21/2011 | 12:00 PM | Indiana, Kentucky, Ohio | RFC | Severe Weather - High Winds | UNK | 165,711 | Weather | ||
| 2011-04-21 | 7:15 AM | 4/21/2011 | 4:50 PM | Oquirrh Substation, Salt Lake City, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-04-21 | 7:00 PM | 4/29/2011 | 7:05 PM | Trenton, Michigan | RFC | Suspicious Activity | UNK | UNK | Physical Attack | ||
| 2011-04-22 | 9:00 PM | 4/22/2011 | 11:00 PM | Metro St. Louis area, Missouri | SERC | Severe Weather | 0 | 55,000 | Weather | ||
| 2011-04-25 | 4:33 PM | 4/25/2011 | 5:19 PM | Northeast Tennessee | SERC | Equipment Malfunction | 140 | UNK | Equipment | ||
| 2011-04-25 | 5:30 PM | 4/27/2011 | 6:00 PM | Arkansas, Louisiana, Mississippi | SPP | Severe Weather | UNK | 141,700 | Weather | ||
| 2011-04-26 | 1:04 PM | 4/26/2011 | 2:00 PM | Salt Lake City, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-04-26 | 6:14 PM | 4/28/2011 | 5:00 PM | Eastern Arkansas | SPP | Severe Weather | 50 | 13,000 | Weather | ||
| 2011-04-26 | 9:51 AM | 4/28/2011 | 9:51 AM | Alabama, Georgia, Mississippi, Tennessee | SERC | Severe Weather | UNK | 55,000 | Weather | ||
| 2011-04-26 | 5:49 AM | 4/27/2011 | 9:59 AM | Southern Louisiana | SPP | Severe Weather | 120 | UNK | Weather | ||
| 2011-04-27 | 10:00 PM | 4/28/2011 | 10:00 AM | Ohio, Tennessee, Virginia | SERC | Severe Weather | 0 | 69,000 | Weather | ||
| 2011-04-27 | 8:00 AM | 5/2/2011 | 4:03 PM | Alabama, Florida, Georgia, Mississippi | SERC | Severe Weather | 1,422 | 426,640 | Weather | ||
| 2011-04-27 | 10:00 AM | 4/29/2011 | 4:29 PM | Alabama, Georgia, Mississippi, Tennessee | SERC | Severe Weather | UNK | 612,000 | Weather | ||
| 2011-04-28 | 4:09 PM | 4/28/2011 | 4:10 PM | Phoenix, Arizona | WECC | Equipment Malfunction | 960 | UNK | Equipment | ||
| 2011-04-28 | 5:00 AM | 4/30/2011 | 6:30 PM | Cleveland area, Ohio | RFC | Severe Weather | UNK | 86,000 | Weather | ||
| 2011-05-02 | 8:52 AM | 5/2/2011 | 10:46 AM | N. Ogden Substation, Ogden, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-02 | 2:00 PM | 5/2/2011 | 2:00 PM | West River Substation, New Haven, Connecticut | NPCC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-05-02 | 5:06 PM | 5/2/2011 | 8:00 PM | Hawaii | N/A | Severe Weather | 220 | 62,000 | Weather | ||
| 2011-05-03 | 12:00 PM | 5/5/2011 | 12:00 PM | St. Lawrence Power Dam, New York | NPCC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-05-04 | 12:20 PM | 5/4/2011 | 3:40 PM | Michigan | RFC | Suspected Sabotage | 0 | 0 | Physical Attack | ||
| 2011-05-05 | 9:15 AM | 5/5/2011 | 9:15 AM | New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-06 | 6:56 AM | 5/6/2011 | 10:30 AM | Alderwood Substation, Portland, Oregon | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-08 | 7:35 PM | 5/8/2011 | 7:35 PM | New York | NPCC | Vandalism | UNK | 0 | Physical Attack | ||
| 2011-05-09 | 1:11 PM | 5/9/2011 | 1:11 PM | Milton, New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-09 | 4:08 AM | 5/9/2011 | 6:40 AM | Holtwood, Pennsylvania | RFC | Suspected Physical Attack | 630 | UNK | Physical Attack | ||
| 2011-05-10 | 3:25 AM | 5/11/2011 | 2:10 PM | Upper Peninsula, Michigan | RFC | Generation Inadequacy; Load Shed; Electrical System Separation (Islanding) | 585 | 78,213 | Islanding | ||
| 2011-05-10 | 1:45 PM | 5/10/2011 | 3:00 PM | New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-10 | 10:21 PM | 5/11/2011 | 2:25 PM | Kentucky, West Virginia | RFC | Severe Weather | UNK | 58,000 | Weather | ||
| 2011-05-11 | 11:00 AM | 5/11/2011 | 11:30 AM | North Chelsea Substation, New York | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-11 | 1:35 PM | 5/11/2011 | 1:35 PM | Green River, Wyoming | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-11 | 3:55 PM | 5/12/2011 | 1:57 PM | Colbyville, Haines Road and Arrowhead Substations, Minnesota | MRO | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-11 | 12:15 AM | 5/11/2011 | 5:20 PM | Charlotte, North Carolina | SERC | Severe Weather | 300 | 71,000 | Weather | ||
| 2011-05-13 | 6:00 AM | 5/13/2011 | 6:00 AM | Salt Lake, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-05-21 | 5:00 PM | 5/22/2011 | 6:34 PM | Dixie Valley Area, Nevada | WECC | Physical Attack | 56 | UNK | Physical Attack | ||
| 2011-05-22 | 5:09 PM | 5/31/2011 | 12:01 PM | Joplin, Sarcoxie, and Wentworth, Missouri | SPP | Severe Weather | 200 | 20,000 | Weather | ||
| 2011-05-23 | 12:30 PM | 5/25/2011 | 12:30 PM | St. Louis County, Missouri | SERC | Severe Weather | UNK | 70,000 | Weather | ||
| 2011-05-23 | 4:45 PM | 5/25/2011 | 11:59 PM | Central, Indiana | RFC | Severe Weather | 1,024 | 215,387 | Weather | ||
| 2011-05-24 | 9:00 AM | 5/25/2011 | 9:10 AM | Chicago, Illinois | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-05-24 | 4:45 PM | 5/26/2011 | 5:00 PM | Central Oklahoma | SPP | Severe Weather | UNK | 54,000 | Weather | ||
| 2011-05-24 | 4:35 PM | 5/25/2011 | 12:40 PM | Eastern Virginia | SERC | Severe Weather | 790 | 175,000 | Weather | ||
| 2011-05-25 | 10:14 PM | 5/28/2011 | 11:00 AM | Central Indiana | RFC | Severe Weather | 200 | 141,000 | Weather | ||
| 2011-05-26 | 1:00 AM | 5/26/2011 | 6:00 AM | Greenwood, Mississippi | SERC | Transmission Level Interruption | 30 | 10,000 | Transmission Interruption | ||
| 2011-05-26 | 7:56 PM | 5/27/2011 | 6:00 PM | Central Pennsylvania | RFC | Severe Weather | 150 | 120,001 | Weather | ||
| 2011-05-26 | 6:30 PM | 5/28/2011 | 4:44 AM | Southern Balancing Area, Georgia | SERC | Severe Weather | 729 | 218,783 | Weather | ||
| 2011-05-29 | 6:30 PM | 5/31/2011 | 10:00 PM | Mid and Southern Lower Peninsula, Michigan | RFC | Severe Weather | 250 | 113,000 | Weather | ||
| 2011-06-02 | 11:45 PM | 6/4/2011 | 4:00 PM | Greater Columbia, South Carolina | SERC | Severe Weather | 0 | 50,465 | Weather | ||
| 2011-06-04 | 1:17 AM | 6/4/2011 | 3:25 AM | Midway, California | WECC | Vandalism | UNK | 420 | Physical Attack | ||
| 2011-06-05 | 8:02 PM | 6/5/2011 | 8:55 PM | Melones, California | WECC | Electrical System Separation (Islanding) | 10 | 5,314 | Islanding | ||
| 2011-06-05 | 5:30 AM | 6/6/2011 | 1:30 AM | Houston Metro-Area, Texas | TRE | Severe Thunderstorms | 473 | 78,000 | Weather | ||
| 2011-06-06 | 12:13 AM | 6/6/2011 | 3:15 AM | El Paso County, Texas; Dona Ana County, New Mexico | SPP | Load Shed/ Automatic undervoltage relay action | 450 | 162,000 | Load Shed | ||
| 2011-06-07 | 2:00 PM | 6/8/2011 | 6:00 AM | Ohio | RFC | Severe Weather | UNK | 52,747 | Weather | ||
| 2011-06-08 | 12:58 PM | 6/8/2011 | 12:58 PM | Fredrickson Substation, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-06-09 | 2:15 PM | 6/9/2011 | 2:15 PM | San Antonio Dam Area, Los Angeles County, California | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-06-09 | 5:51 PM | 6/10/2011 | 12:00 PM | Western, Massachusetts; Connecticut | NPCC | Severe Thunderstorms | 0 | 100,000 | Weather | ||
| 2011-06-09 | 4:30 AM | 6/9/2011 | 12:00 PM | Illinois | RFC | Severe Thunderstorms | UNK | 169,000 | Weather | ||
| 2011-06-12 | 7:00 PM | 6/12/2011 | 8:30 PM | Virginia | RFC | Severe Thunderstorms | 250 | 56,000 | Weather | ||
| 2011-06-15 | 4:00 PM | 6/16/2011 | 6:30 AM | Bingham County, Idaho | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-06-15 | 7:17 PM | 6/16/2011 | 1:45 AM | Piedmont, North Carolina | SERC | Severe Thunderstorms | 300 | 70,135 | Weather | ||
| 2011-06-15 | 7:15 PM | 6/16/2011 | 6:00 AM | Georgia | SERC | Severe Thunderstorms | 563 | 169,000 | Weather | ||
| 2011-06-18 | 4:45 PM | 6/20/2011 | 11:59 PM | Eastern, Arkansas | SPP | Public Appeal to Reduce Electricity Usage | UNK | UNK | Public Appeal | ||
| 2011-06-18 | 5:00 PM | 6/18/2011 | 9:33 PM | North Carolina; South Carolina | SERC | Severe Thunderstorms | 300 | 70,000 | Weather | ||
| 2011-06-18 | 3:30 PM | 6/19/2011 | 3:42 PM | Northern, Georgia | SERC | Severe Thunderstorms | 312 | 93,828 | Weather | ||
| 2011-06-20 | 10:36 AM | 6/20/2011 | 10:36 AM | Collins Substation, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-06-21 | 6:30 PM | 6/22/2011 | 7:00 AM | AEP Region | RFC | Severe Weather | UNK | 56,000 | Weather | ||
| 2011-06-21 | 9:45 PM | 6/23/2011 | 2:00 AM | Illinois | RFC | Severe Thunderstorms | UNK | 300,000 | Weather | ||
| 2011-06-22 | 8:12 PM | 6/22/2011 | 8:12 PM | Knoble Substation, Spanaway, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-06-22 | 7:00 PM | 6/23/2011 | 1:00 AM | Alabama; Georgia | SERC | Severe Thunderstorms | 316 | 75,101 | Weather | ||
| 2011-06-22 | 9:46 AM | 6/22/2011 | 9:46 AM | Knoxville, Tennessee | SERC | Severe Weather | UNK | 106,300 | Weather | ||
| 2011-06-23 | 8:10 AM | 6/23/2011 | 9:00 AM | Highgate, Vermont | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-06-24 | 6:30 PM | 6/25/2011 | 1:30 AM | North/North Central Alabama; Georgia | SERC | Severe Thunderstorms | 340 | 102,275 | Weather | ||
| 2011-06-26 | 4:46 PM | 6/27/2011 | 7:59 AM | Southwest Kansas | SPP | Public Appeal to Reduce Electricity Usage | UNK | UNK | Public Appeal | ||
| 2011-06-26 | 6:00 PM | 6/27/2011 | 1:00 PM | Alabama; Georgia | SERC | Severe Thunderstorms | 300 | 90,160 | Weather | ||
| 2011-06-27 | 6:55 PM | 6/27/2011 | 6:55 PM | Olympic Pipeline Substation, Washington | WECC | Vandalism | UNK | UNK | Physical Attack | ||
| 2011-06-27 | 3:00 PM | 6/27/2011 | 7:00 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-06-27 | 12:00 AM | 6/29/2011 | 1:00 AM | Illinois; Missouri | SERC | Severe Thunderstorms | UNK | 80,000 | Weather | ||
| 2011-06-29 | 11:30 AM | 6/29/2011 | 6:04 PM | Panhandle and Muleshoe, Texas | SPP | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-06-30 | 2:11 PM | 6/30/2011 | 11:25 PM | Phoenix, Arizona | WECC | Major System Interruption/Load Shed | 5,299 | 160,000 | Load Shed | ||
| 2011-06-30 | 10:31 PM | 6/30/2011 | 10:31 PM | Olympic Pipeline Substation, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-06-30 | 10:30 PM | 7/1/2011 | 5:00 PM | Illinois | RFC | Severe Weather | UNK | 121,000 | Weather | ||
| 2011-07-01 | 8:00 AM | 7/1/2011 | 8:01 AM | CONVEX Local Control Center, Connecticut | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-01 | 4:38 PM | 7/1/2011 | 10:38 PM | Greene County Ohio | RFC | Vandalism | N/A | 0 | Physical Attack | ||
| 2011-07-01 | 5:00 PM | 7/3/2011 | 8:00 PM | Southwest and South Central Minnesota | MRO | Severe Weather | UNK | 70,000 | Weather | ||
| 2011-07-02 | 8:15 PM | 7/6/2011 | 10:00 PM | South East, Lower Peninsula, Michigan | RFC | Severe Weather | UNK | 182,000 | Weather | ||
| 2011-07-04 | 6:00 PM | 7/4/2011 | 9:00 PM | Virginia | SERC | Severe Weather | 150 | 51,580 | Weather | ||
| 2011-07-05 | 10:40 AM | 7/5/2011 | 11:37 AM | West Valley Substation Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-06 | 9:51 AM | 7/6/2011 | 9:52 AM | Vermont | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-08 | 10:00 AM | 7/11/2011 | 9:00 AM | PJM Corporate Office, Pennsylvania | RFC | Suspected Cyber Attack | UNK | UNK | Cyber Attack | ||
| 2011-07-08 | 10:00 AM | 7/8/2011 | 10:00 AM | Saginaw, Minnesota | MRO | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-11 | 1:13 PM | 7/11/2011 | 1:13 PM | Southwest Ohio | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-11 | 1:30 PM | 7/11/2011 | 1:30 PM | Maine | NPCC | Vandalism | N/A | 0 | Physical Attack | ||
| 2011-07-11 | 11:15 AM | 7/12/2011 | 8:15 AM | Western and Southern Lower Peninsula Michigan | RFC | Severe Weather | UNK | 85,000 | Weather | ||
| 2011-07-11 | 9:00 AM | 7/11/2011 | 10:25 AM | Michigan | RFC | Severe Weather | 254 | 103,000 | Weather | ||
| 2011-07-11 | 2:27 PM | 7/12/2011 | 3:50 PM | Indiana, Michigan, Ohio | RFC | Severe Weather | UNK | 120,000 | Weather | ||
| 2011-07-11 | 9:00 AM | 7/11/2011 | 9:00 AM | Illinois | RFC | Severe Weather | UNK | 500,000 | Weather | ||
| 2011-07-12 | 12:00 PM | 7/12/2011 | 12:00 PM | Maine | NPCC | Vandalism | N/A | 0 | Physical Attack | ||
| 2011-07-12 | 8:20 PM | 7/12/2011 | 9:30 PM | California | WECC | Suspected Physical Attack | UNK | UNK | Physical Attack | ||
| 2011-07-13 | 5:19 PM | 7/13/2011 | 10:03 PM | Pueblo, Colorado | WECC | Load Shed | 580 | N/A | Load Shed | ||
| 2011-07-14 | 11:00 AM | 7/14/2011 | 7:00 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-07-18 | 5:00 PM | 7/24/2011 | 1:30 PM | Southeast Michigan | RFC | Severe Weather | N/A | 197,166 | Weather | ||
| 2011-07-19 | 11:45 AM | 7/19/2011 | 3:00 PM | Maine | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-20 | 9:10 AM | 7/20/2011 | 4:30 PM | Frederickson Substation, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-21 | 12:32 PM | 7/22/2011 | 6:30 AM | Lower Peninsula, Michigan | RFC | Public Appeal to Reduce Electricity Usage | 8,881 | N/A | Public Appeal | ||
| 2011-07-21 | 1:00 PM | 7/21/2011 | 3:00 PM | Springfield, Illinois | SERC | Public Appeal to Reduce Electricity Usage | N/A | N/A | Public Appeal | ||
| 2011-07-22 | 11:34 AM | 7/22/2011 | 5:26 PM | Ohio | RFC | Load Shed | 206 | 23,000 | Load Shed | ||
| 2011-07-22 | 11:00 AM | 7/22/2011 | 6:00 PM | Upstate, New York | NPCC | Public Appeal to Reduce Electricity Usage | N/A | N/A | Public Appeal | ||
| 2011-07-23 | 2:30 AM | 7/24/2011 | 9:00 AM | Illinois | RFC | Severe Weather | UNK | 169,000 | Weather | ||
| 2011-07-24 | 2:34 PM | 7/24/2011 | 3:47 PM | Southern, New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-26 | 12:01 PM | 7/26/2011 | 12:01 PM | Backup Control Center, Oklahoma | SPP | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-07-27 | 12:07 PM | 7/27/2011 | 12:08 PM | Fife, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-28 | 7:26 AM | 7/29/2011 | 7:26 AM | Daviess County, Kentucky | SERC | Fuel Supply Deficiency (Coal) | N/A | N/A | Fuel Supply Deficiency | ||
| 2011-07-28 | 1:32 PM | 7/28/2011 | 1:32 PM | Indiana | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-28 | 7:25 PM | 7/28/2011 | 7:25 PM | Spanaway, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-28 | 12:14 AM | 7/29/2011 | 12:00 PM | Entire ComEd Territory, Indiana | RFC | Severe Weather | UNK | 201,000 | Weather | ||
| 2011-07-29 | 11:46 AM | 7/29/2011 | 5:00 PM | Fredrickson, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-07-29 | 8:45 PM | 8/1/2011 | 4:24 AM | Central New Jersey | RFC | Severe Weather | N/A | 67,900 | Weather | ||
| 2011-08-01 | 2:18 PM | 8/1/2011 | 2:18 PM | Jefferson, Oregon | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-08-01 | 3:00 PM | 8/5/2011 | 7:00 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-08-02 | 10:15 AM | 8/3/2011 | 9:16 AM | Oklahoma | SPP | Public Appeal to Reduce Electricity Usage | N/A | N/A | Public Appeal | ||
| 2011-08-02 | 9:30 PM | 8/3/2011 | 7:00 PM | Northeast, Illinois | RFC | Severe Weather | UNK | 71,500 | Weather | ||
| 2011-08-03 | 10:00 AM | 8/19/2011 | 10:00 AM | Western New York | NPCC | Fuel Supply Deficiency (Coal) | 675 | UNK | Fuel Supply Deficiency | ||
| 2011-08-03 | 4:30 PM | 8/3/2011 | 9:00 PM | Central Arkansas | SPP | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-08-03 | 4:29 PM | 8/3/2011 | 11:40 PM | Northeast Oklahoma | SPP | Public Appeal to Reduce Electricity Usage | 300 | N/A | Public Appeal | ||
| 2011-08-04 | 10:30 AM | 8/4/2011 | 4:00 PM | Arkansas, Oklahoma, Texas | SPP | Public Appeal to Reduce Electricity Usage | N/A | N/A | Public Appeal | ||
| 2011-08-08 | 7:36 PM | 8/9/2011 | 12:00 PM | Oklahoma | SPP | Electrical System Separation (Islanding) | 92 | 14,500 | Islanding | ||
| 2011-08-08 | 9:30 AM | 8/8/2011 | 9:30 AM | Greene County, Ohio | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-08-08 | 9:35 AM | 8/8/2011 | 4:00 PM | Collins Substation, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-08-08 | 8:58 PM | 8/10/2011 | 4:30 PM | Northern and Central Oklahoma | SPP | Severe Weather | N/A | 54,000 | Weather | ||
| 2011-08-09 | 10:26 AM | 8/9/2011 | 5:00 PM | Polk Substation, Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-08-13 | 4:41 PM | 8/14/2011 | 7:00 PM | Kentucky | SERC | Severe Weather | UNK | 181,700 | Weather | ||
| 2011-08-15 | 2:05 AM | 8/15/2011 | 3:40 AM | Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-08-18 | 9:51 AM | 8/18/2011 | 4:00 PM | Collins Substation, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-08-20 | 5:42 PM | 8/23/2011 | 8:00 PM | Southeastern Michigan | RFC | Severe Weather | 254 | 65,000 | Weather | ||
| 2011-08-21 | 10:45 PM | 8/23/2011 | 10:45 PM | Puerto Rico | N/A | Severe Weather | 2,200 | 931,000 | Weather | ||
| 2011-08-22 | 10:05 AM | 8/22/2011 | 4:00 PM | Collins Substation, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-08-23 | 1:51 PM | 8/23/2011 | 1:51 PM | Virginia | RFC | Earthquake | 0 | 0 | Natural Disaster | ||
| 2011-08-23 | 10:30 AM | 8/23/2011 | 4:54 PM | Southeastern New Mexico, Texas Panhandle | SPP | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-08-23 | 3:43 PM | 8/23/2011 | 7:00 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-08-24 | 1:20 PM | 8/29/2011 | 7:00 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | 0 | 0 | Public Appeal | ||
| 2011-08-24 | 2:51 PM | 8/24/2011 | 10:00 PM | Arkansas, Louisiana, Texas | SPP | Severe Weather | N/A | 53,064 | Weather | ||
| 2011-08-24 | 7:45 AM | 8/25/2011 | 6:00 AM | Houston area, Texas | TRE | Severe Weather | 485 | 79,000 | Weather | ||
| 2011-08-25 | 12:01 AM | 8/25/2011 | 12:01 AM | Maine | NPCC | Suspected Physical Attack | 0 | 0 | Cyber Attack | ||
| 2011-08-25 | 12:30 AM | 8/28/2011 | 8:00 PM | Cleveland area, Ohio | RFC | Severe Weather | N/A | 107,833 | Weather | ||
| 2011-08-26 | 12:30 AM | 8/28/2011 | 12:30 AM | Pennsylvania | RFC | Severe Weather | N/A | 200,717 | Weather | ||
| 2011-08-27 | 2:00 AM | 8/27/2011 | 5:15 AM | Wilson County North Carolina | SERC | Distribution System Interruption | 2 | 1,200 | Distribution Interruption | ||
| 2011-08-27 | 11:00 PM | 8/29/2011 | 8:00 AM | Maryland | RFC | Severe Weather | UNK | 108,000 | Weather | ||
| 2011-08-27 | 7:00 PM | 8/29/2011 | 1:31 PM | Eastern North Carolina | SERC | Severe Weather | 200 | 136,000 | Weather | ||
| 2011-08-27 | 10:00 PM | 8/29/2011 | 4:00 PM | Southern New Jersey | RFC | Severe Weather | 320 | 140,000 | Weather | ||
| 2011-08-27 | 1:00 PM | 8/29/2011 | 1:00 PM | Delaware; Maryland | RFC | Severe Weather | N/A | 165,000 | Weather | ||
| 2011-08-27 | 11:05 PM | 8/29/2077 | 3:30 PM | District of Columbia; Maryland | RFC | Severe Weather | N/A | 220,000 | Weather | ||
| 2011-08-27 | 10:00 PM | 8/29/2011 | 10:00 PM | Pennsylvania | RFC | Severe Weather | N/A | 264,000 | Weather | ||
| 2011-08-27 | 2:57 AM | 8/29/2011 | 11:30 PM | Eastern North Carolina | SERC | Severe Weather | UNK | 285,465 | Weather | ||
| 2011-08-27 | 8:30 PM | 9/4/2011 | 11:30 PM | Maryland | RFC | Severe Weather | 1,114 | 760,113 | Weather | ||
| 2011-08-27 | 10:33 AM | 8/29/2011 | 2:00 PM | North Carolina; Virginia | SERC | Severe Weather | UNK | 1,000,000 | Weather | ||
| 2011-08-28 | 8:55 PM | 8/28/2011 | 11:39 PM | Calapooya Substation, Oregon | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-08-28 | 5:01 AM | 9/3/2011 | 5:01 AM | Borough's and Westshester County New York | NPCC | Severe Weather | N/A | 50,000 | Weather | ||
| 2011-08-28 | 12:10 PM | 8/28/2011 | 12:11 PM | Eastern Massachusetts | NPCC | Severe Weather | N/A | 50,000 | Weather | ||
| 2011-08-28 | 7:00 AM | 9/3/2011 | 12:01 AM | New York | NPCC | Severe Weather | UNK | 99,700 | Weather | ||
| 2011-08-28 | 9:42 AM | 8/30/2011 | 12:01 AM | Eastern New York | NPCC | Severe Weather | N/A | 100,000 | Weather | ||
| 2011-08-28 | 12:30 PM | 8/28/2011 | 12:31 PM | New York | NPCC | Severe Weather | N/A | 116,000 | Weather | ||
| 2011-08-28 | 5:00 AM | 8/30/2011 | 5:00 AM | Long Island, New York | NPCC | Severe Weather | UNK | 152,261 | Weather | ||
| 2011-08-28 | 7:40 AM | 8/29/2011 | 7:40 AM | Southwest Connecticut | NPCC | Severe Weather | N/A | 158,000 | Weather | ||
| 2011-08-28 | 12:01 AM | 8/30/2011 | 12:01 AM | Mid-Hudson, New York | NPCC | Severe Weather | N/A | 180,000 | Weather | ||
| 2011-08-28 | 2:58 AM | 8/30/2011 | 2:58 AM | Eastern and Northeastern Pennsylvania | RFC | Severe Weather | 110 | 284,000 | Weather | ||
| 2011-08-28 | 12:30 AM | 8/30/2011 | 12:30 AM | Northern and Central New Jersey | RFC | Severe Weather | N/A | 650,000 | Weather | ||
| 2011-08-28 | 12:23 AM | 8/30/2011 | 12:23 AM | New Jersey | RFC | Severe Weather | 500 | 665,000 | Weather | ||
| 2011-08-31 | 12:52 PM | 8/31/2011 | 12:52 PM | Southwest Ohio | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-09-01 | 8:13 AM | 9/1/2011 | 4:00 PM | Graham Substaion, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-03 | 2:00 PM | 9/8/2011 | 6:00 PM | Southeast Lower Peninsula, Michigan | RFC | Severe Weather | UNK | 105,000 | Weather | ||
| 2011-09-05 | 4:30 PM | 9/7/2011 | 3:45 PM | Alabama; Georgia | SERC | Severe Weather | 177 | 53,295 | Weather | ||
| 2011-09-07 | 12:08 AM | 9/7/2011 | 10:50 AM | Western Connecticut; New York | NPCC | Actual Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-09-08 | 3:28 PM | 9/10/2011 | 3:30 PM | Arizona; California | WECC | Transmission/Distribution Interruption; Load Shed; Generation Inadequacy | 7,000 | 2,000,000 | Generation Interruption | ||
| 2011-09-08 | 7:53 PM | 9/9/2011 | 4:00 PM | Collins Substation, Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-12 | 9:15 AM | 9/12/2011 | 3:30 PM | English Creek, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-09-13 | 2:03 PM | 9/13/2011 | 6:21 PM | Saranac, New York | NPCC | Vandalism | N/A | 0 | Physical Attack | ||
| 2011-09-13 | 11:43 AM | 9/14/2011 | 4:00 PM | Lacamas Substation, Roy, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-14 | 9:00 AM | 9/14/2011 | 2:00 PM | Salt Lake County, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-09-20 | 12:55 PM | 9/20/2011 | 5:00 PM | Lacamas Substaion, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-21 | 2:37 PM | 9/21/2011 | 3:47 PM | Puerto Rico | N/A | Generation Inadequacy; Load Shed | 600 | 319,616 | Generation Interruption | ||
| 2011-09-21 | 10:30 AM | 9/21/2011 | 10:30 AM | Hockessin, Delaware | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-09-22 | 2:50 PM | 9/22/2011 | 2:51 PM | Montgomery County, Ohio | RFC | Vandalism | N/A | 0 | Physical Attack | ||
| 2011-09-23 | 9:04 AM | 9/23/2011 | 9:04 AM | North Haven, Connecticut | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-09-24 | 4:17 PM | 9/25/2011 | 4:00 PM | Collins Substation, Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-26 | 10:15 AM | 9/26/2011 | 10:15 AM | McKee City, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-09-28 | 2:59 PM | 9/28/2011 | 2:59 PM | Dorothy, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-09-28 | 4:41 PM | 9/28/2011 | 4:41 PM | Bethany Beach, Delaware | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-09-28 | 9:30 AM | 9/28/2011 | 1:00 PM | Watertown, Connecticut | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-29 | 6:44 PM | 9/30/2011 | 4:00 PM | Collins Substation, Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-09-29 | 5:00 AM | 9/30/2011 | 6:00 AM | Houston metro area, Texas | TRE | Severe Weather | N/A | 65,000 | Weather | ||
| 2011-09-30 | 8:22 AM | 9/30/2011 | 8:22 AM | Wilmington, Delaware | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-10-06 | 11:07 AM | 10/6/2011 | 11:07 AM | Oquirrh Substation, Utah | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-10-07 | 8:04 AM | 10/7/2011 | 4:00 PM | Olympic Pipeline, Spanaway, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-10-14 | 2:20 PM | 10/14/2011 | 2:20 PM | English Creek, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-10-17 | 3:34 AM | 10/17/2011 | 10:42 AM | Seat Pleasant, Maryland | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-10-17 | 3:44 PM | 10/17/2011 | 3:44 PM | Southwest Ohio | RFC | Vandalism | 7 | 2,000 | Physical Attack | ||
| 2011-10-18 | 3:45 AM | 10/18/2011 | 5:25 AM | Holmesburg Substation, Philadelphia, Pennsylvania | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-10-20 | 7:15 AM | 10/20/2011 | 7:15 AM | McKee, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-10-24 | 11:37 PM | 10/26/2011 | 11:00 PM | Holmesburg Substation, Philadelphia, Pennsylvania | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-10-26 | 5:00 AM | 10/27/2011 | 3:00 PM | Denver; Ft. Collins, Colorado | WECC | Severe Weather | UNK | 204,000 | Weather | ||
| 2011-10-27 | 1:00 AM | 10/27/2011 | 2:36 AM | Munster, Indiana | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2011-10-29 | 8:59 AM | 11/7/2011 | 3:00 PM | Pennsylvania | RFC | Severe Weather | UNK | 50,000 | Weather | ||
| 2011-10-29 | 4:16 PM | 11/2/2011 | 9:30 PM | New York City area | NPCC | Severe Weather | UNK | 50,000 | Weather | ||
| 2011-10-29 | 8:00 PM | 10/31/2011 | 8:00 PM | New Jersey; New York | NPCC, RFC | Severe Weather | N/A | 74,000 | Weather | ||
| 2011-10-29 | 2:00 PM | 10/31/2011 | 14:00 | Southeast Pennsylvania | RFC | Severe Weather | UNK | 109,335 | Weather | ||
| 2011-10-29 | 3:00 PM | 11/2/2011 | 8:15 AM | Mid-Hudson Valley Region, New York | NPCC | Severe Weather | N/A | 145,000 | Weather | ||
| 2011-10-29 | 12:57 PM | 11/3/2011 | 11:00 PM | Harrisburg, Lehigh Valley, Lancaster Region Pennsylvania | RFC | Severe Weather | UNK | 146,721 | Weather | ||
| 2011-10-29 | 11:18 AM | 11/4/2011 | 12:00 AM | Southeast New York | NPCC | Severe Weather | UNK | 161,151 | Weather | ||
| 2011-10-29 | 2:30 PM | 11/6/2011 | 12:00 PM | New Jersey | RFC | Severe Weather | 125 | 197,000 | Weather | ||
| 2011-10-29 | 8:59 AM | 11/7/2011 | 7:58 PM | Pennsylvania | RFC | Severe Weather | UNK | 312,359 | Weather | ||
| 2011-10-29 | 9:59 AM | 11/7/2011 | 1:00 PM | Northwest and Central New Jersey | RFC | Severe Weather | UNK | 379,000 | Weather | ||
| 2011-10-29 | 4:14 PM | 11/7/2011 | 4:00 PM | Connecticut; Maine; Massachusetts; New Hampshire; Rhode Island | NPCC | Severe Weather | UNK | 1,418,100 | Weather | ||
| 2011-11-04 | 10:46 AM | 11/4/2011 | 10:46 AM | Sweetwater County, Wyoming | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-11-13 | 11:30 AM | 11/13/2011 | 12:00 PM | Cate Road, Deerfield, New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-11-14 | 2:24 PM | 11/14/2011 | 2:24 PM | McKee, New Jersey | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-11-22 | 11:16 PM | 11/22/2011 | 11:16 PM | Indiana | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-11-30 | 10:00 AM | 11/30/2011 | 11:00 AM | Orchard Substation, Washington | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2011-11-30 | 4:56 PM | 12/2/2011 | 10:00 AM | City of Los Angeles, California | WECC | Severe Weather | UNK | 150,000 | Weather | ||
| 2011-12-01 | 10:00 AM | 12/2/2011 | 1:11 PM | Wasatch Front Area Utah | WECC | Severe Weather | UNK | 60,000 | Weather | ||
| 2011-12-01 | 12:45 AM | 12/7/2011 | 9:00 PM | Southern California | WECC | Severe Weather | UNK | 91,690 | Weather | ||
| 2011-12-01 | 3:29 AM | 12/2/2011 | 1:05 PM | Northern California | WECC | Severe Weather | 300 | 100,000 | Weather | ||
| 2011-12-02 | 4:15 PM | 12/2/2011 | 8:30 PM | Rusk County Texas | TRE | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-12-05 | 2:00 PM | 12/6/2011 | 5:00 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-12-06 | 5:38 PM | 12/7/2011 | 11:04 AM | Montague, Michigan | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2011-12-06 | 8:00 AM | 12/6/2011 | 8:00 PM | Bismarck-Mandan, North Dakota | MRO | Public Appeal to Reduce Electricity Usage | 155 | 34,500 | Public Appeal | ||
| 2011-12-07 | 7:29 PM | 12/7/2011 | 10:57 PM | Central Virginia | SERC | Severe Weather | 240 | 60,000 | Weather | ||
| 2011-12-08 | 8:45 AM | 12/8/2011 | 4:30 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-12-13 | 3:19 AM | 12/14/2011 | 3:19 AM | Clinton County Ohio | RFC | Suspected Physical Attack | N/A | 0 | Physical Attack | ||
| 2011-12-19 | 8:48 AM | 12/19/2011 | 4:00 PM | Croft Substation, Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-12-20 | 7:45 AM | 12/20/2011 | 8:45 AM | Sweet Home, Oregon | WECC | Suspected Physical Attack | 12 | 2,500 | Physical Attack | ||
| 2011-12-20 | 9:30 AM | 12/20/2011 | 9:31 AM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2011-12-21 | 10:30 AM | 12/21/2011 | 10:30 AM | Boise, Idaho | WECC | Suspected Cyber Attack | 0 | 0 | Cyber Attack | ||
| 2011-12-31 | 9:26 PM | 12/31/2011 | 9:26 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-01-04 | 12:14 PM | 1/4/2012 | 12:14 PM | Tacoma, Washington | WECC | Suspected physical attack | N/A | N/A | Physical Attack | ||
| 2012-01-05 | 10:35 AM | 1/5/2012 | 12:25 PM | CSWS/AEP West territory, Oklahoma | SPP | Sabotage | 0 | 0 | Physical Attack | ||
| 2012-01-05 | 10:28 AM | 1/5/2012 | 12:25 PM | Creek County, Oklahoma | SPP | Suspected physical attack | N/A | N/A | Physical Attack | ||
| 2012-01-09 | 1:36 PM | 1/11/2012 | 1:05 AM | Louisiana | SERC | Load Shed | 150 | 1 | Load Shed | ||
| 2012-01-09 | 2:30 PM | 1/9/2012 | 3:30 PM | Watertown, Connecticut | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-01-10 | 9:30 PM | 1/10/2012 | 9:30 PM | Rusk County, Texas | TRE | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-01-11 | 7:19 AM | 1/11/2012 | 9:07 AM | Nevada | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-01-12 | 8:26 AM | 1/12/2012 | 8:26 AM | Newark, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-01-13 | 9:20 AM | 1/13/2012 | 9:20 AM | Newark, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-01-15 | 9:35 AM | 1/15/2012 | 9:35 AM | Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-01-17 | 10:31 AM | 1/17/2012 | 5:21 PM | Austin, Texas | TRE | Suspected Cyber Attack | N/A | 0 | Cyber Attack | ||
| 2012-01-19 | 7:00 AM | 1/20/2012 | 3:00 PM | King, Pierce and Thurston Counties, Washington | WECC | Severe Weather - Winter Storm | 1,600 | 426,000 | Weather | ||
| 2012-01-24 | 11:22 AM | 1/24/2012 | 11:22 AM | Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-01-27 | 9:40 AM | 1/27/2012 | 9:40 AM | Frederickson Substation, Spanaway, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-01-29 | 12:45 PM | 1/29/2012 | 12:45 PM | Roosevelt Substation, Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-02-11 | 8:47 AM | 2/11/2012 | 10:30 AM | Lamar, Colorado | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-02-11 | 8:55 AM | 2/11/2012 | 8:55 AM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-02-13 | 7:02 AM | 2/13/2012 | 4:25 PM | Asheville, North Carolina | SERC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-02-14 | 7:20 PM | 2/15/2012 | 4:00 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-02-15 | 5:33 AM | 2/15/2012 | 5:30 PM | Port Orchard, Washington | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-02-17 | 3:00 AM | 2/17/2012 | 11:33 AM | Little Rock, Arkansas | SERC | Suspected Cyber Attack | UNK | UNK | Cyber Attack | ||
| 2012-02-19 | 5:00 PM | 2/21/2012 | 7:33 AM | Kentucky, Virginia, West Virginia | SERC | Severe Weather - Winter Storm | UNK | 90,000 | Weather | ||
| 2012-02-23 | 5:45 AM | 2/23/2012 | 3:02 PM | South East College Station, Texas | TRE | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-02-23 | 11:12 PM | 2/24/2012 | 1:00 AM | Londonderry, New Hampshire | NPCC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-02-24 | 11:24 AM | 2/24/2012 | 11:49 AM | Spanaway, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-02-28 | 2:59 AM | 2/28/2012 | 6:12 AM | Sacramento, California | WECC | Electrical System Separation (Islanding) | 1 | 1 | Islanding | ||
| 2012-02-28 | 7:00 AM | 2/28/2012 | 7:00 AM | Coos County Oregon | WECC | Suspected Physical Attack | UNK | UNK | Physical Attack | ||
| 2012-03-02 | 1:45 PM | 3/2/2012 | 3:30 PM | Piggott, Arkansas | SERC | Operational Failure/Equipment Malfunction | N/A | N/A | Equipment | ||
| 2012-03-02 | 9:00 PM | 3/5/2012 | 4:30 PM | Southeastern, Michigan | RFC | Severe Weather - Winter Storm | 371 | 130,000 | Weather | ||
| 2012-03-02 | 9:00 PM | 3/4/2012 | 5:30 PM | Lower Peninsula, Michigan | RFC | Severe Weather - Winter Storm | 50 | 140,000 | Weather | ||
| 2012-03-02 | 12:37 PM | 3/5/2012 | 12:01 PM | Northern Alabama; Southeast Tennessee | SERC | Severe Weather - Tornadoes | 500 | UNK | Weather | ||
| 2012-03-04 | 1:27 AM | 3/4/2012 | 6:58 AM | Prince Georges County, Maryland | RFC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-03-04 | 1:38 PM | 3/5/2012 | 11:00 AM | Texas | SERC | Suspected Physical Attack | UNK | UNK | Physical Attack | ||
| 2012-03-16 | 4:00 PM | 3/16/2012 | 4:00 PM | New Castle, Delaware | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-03-20 | 8:00 AM | 3/20/2012 | 1:00 PM | Houston, Texas | TRE | Severe Weather - Thunderstorms | N/A | 96,000 | Weather | ||
| 2012-03-23 | 7:34 PM | 3/23/2012 | 7:34 PM | Newark, Delaware | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-03-26 | 1:24 PM | 3/26/2012 | 1:24 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-03-28 | 10:17 AM | 3/28/2012 | 10:17 AM | Graham, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-03-29 | 12:01 PM | 3/29/2012 | 12:02 PM | Lansing, Michigan | RFC | Electrical System Separation (Islanding) | UNK | 0 | Islanding | ||
| 2012-03-30 | 11:10 AM | 3/30/2012 | 11:30 AM | Vermont | NPCC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-01 | 8:27 PM | 4/3/2012 | 8:28 AM | Council Bluffs, Iowa | MRO | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-04-03 | 11:10 AM | 4/3/2012 | 11:25 AM | West Rutland, Vermont | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-04-03 | 3:33 PM | 4/3/2012 | 8:25 PM | Seattle, Washington | WECC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-04-04 | 3:32 PM | 4/6/2012 | 3:30 PM | WAPA-SNR Regional Office, California | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-07 | 9:31 AM | 4/7/2012 | 9:32 AM | Newark, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-04-07 | 12:25 PM | 4/7/2012 | 12:26 PM | Newark, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-04-07 | 2:35 PM | 4/7/2012 | 2:36 PM | Newark, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-04-11 | 9:00 AM | 4/11/2012 | 9:00 AM | North Attleboro, Massachusetts | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-04-12 | 8:08 AM | 4/12/2012 | 4:30 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-15 | 7:38 PM | 4/15/2012 | 9:26 PM | Georgia | SERC | Suspected Physical Attack | UNK | UNK | Physical Attack | ||
| 2012-04-16 | 3:46 PM | 4/19/2012 | 2:00 AM | Southeast, Michigan | RFC | Severe Weather - High Winds | 218 | 111,393 | Weather | ||
| 2012-04-17 | 6:11 AM | 4/17/2012 | 5:48 PM | San Diego County, California | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-04-19 | 7:53 AM | 4/19/2012 | 4:00 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-20 | 2:27 PM | 4/21/2012 | 4:27 AM | Metropolitan Houston, Texas | TRE | Severe Weather - Thunderstorms | N/A | 120,377 | Weather | ||
| 2012-04-21 | 3:02 PM | 4/21/2012 | 8:09 PM | East Bridgewater, Massachusetts | NPCC | Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-21 | 8:55 PM | 4/23/2012 | 4:30 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-23 | 8:11 AM | 4/23/2012 | 12:47 PM | Northwest Indiana | RFC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-04-23 | 11:56 AM | 4/23/2012 | 3:35 PM | Snohomish County, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-05-07 | 12:50 PM | 5/7/2012 | 2:00 PM | Williston, Vermont | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-05-07 | 5:45 PM | 5/7/2012 | 6:06 PM | Eastern Ohio | RFC | Load Shed/Severe Weather - Lightning Storm | 420 | 1 | Weather | ||
| 2012-05-11 | 11:05 AM | 5/11/2012 | 11:20 AM | Lakewood, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-05-24 | 3:20 PM | 5/25/2012 | 5:29 PM | Tyngsborough, Massachusetts | NPCC | Physical Attack | UNK | UNK | Physical Attack | ||
| 2012-05-29 | 8:35 PM | 5/31/2012 | 10:00 AM | Oklahoma City Metro Area, Oklahoma | SPP | Severe Weather - Thunderstorms | UNK | 112,000 | Weather | ||
| 2012-05-29 | 6:30 PM | 5/29/2012 | 7:40 PM | Alder Dam, Pierce County, Washington | WECC | Physical Attack | N/A | N/A | Weather | ||
| 2012-05-31 | 11:45 PM | 6/1/2012 | 4:30 AM | Columbus, Ohio | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-06-02 | 7:30 AM | 6/2/2012 | 11:35 AM | San Francisco, California | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-06-06 | 12:37 PM | 6/6/2012 | 12:37 PM | Columbia Heights, NW, Washington DC | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-06-06 | 8:00 AM | 6/6/2012 | 8:00 AM | Delhi, New York | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-06-08 | 5:20 PM | 6/8/2012 | 5:25 PM | Denver Metro Area, Colorado | WECC | Load Shed | 120 | 30,379 | Load Shed | ||
| 2012-06-11 | 7:50 PM | 6/12/2012 | 3:00 PM | North/Central Alabama; North/Central Georgia | SERC | Severe Weather - Thunderstorms | 368 | 110,591 | Weather | ||
| 2012-06-12 | 3:57 PM | 6/14/2012 | 4:57 AM | Houston, Texas | TRE | Severe Weather - Thunderstorms | 920 | 175,000 | Weather | ||
| 2012-06-13 | 4:55 PM | 6/13/2012 | 10:09 PM | San Juan County, New Mexico | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-06-19 | 5:30 AM | 6/21/2012 | 5:30 AM | CAISO Territory California | WECC | Fuel Supply Deficiency (Water) | UNK | UNK | Fuel Supply Deficiency | ||
| 2012-06-19 | 4:30 AM | 6/20/2012 | 11:00 PM | Minneapolis/St. Paul, Minnesota | MRO | Severe Weather - Thunderstorms | UNK | 68,200 | Weather | ||
| 2012-06-23 | 6:57 PM | 6/23/2012 | 7:28 PM | North Shore, Massachusetts | NPCC | Load Shed | 51 | 29,250 | Load Shed | ||
| 2012-06-25 | 4:04 PM | 6/26/2012 | 1:45 PM | Central Virginia | SERC | Severe Weather - Wind & Rain | 600 | 190,000 | Weather | ||
| 2012-06-29 | 12:10 PM | 6/29/2012 | 5:02 PM | Puerto Rico | N/A | Equipment Trip & Failure | 1,800 | 900,000 | Equipment | ||
| 2012-06-29 | 10:45 AM | 6/29/2012 | 10:45 AM | New Castle, Delaware | RFC | Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-06-29 | 4:00 PM | 6/29/2012 | 9:00 PM | Eastern, Arkansas | SERC | Public Appeal to Reduce Electricity Usage | 45 | 7,935 | Public Appeal | ||
| 2012-06-29 | 11:30 PM | 6/30/2012 | 2:00 AM | Northeast Illinois | RFC | Severe Weather - Thunderstorms | UNK | 109,000 | Weather | ||
| 2012-06-29 | 7:00 PM | 7/7/2012 | 7:43 PM | Maryland; West Virginia | RFC | Severe Weather - Thunderstorms | UNK | 145,000 | Weather | ||
| 2012-06-29 | 2:10 PM | 7/4/2012 | 6:00 PM | Dayton, Ohio | RFC | Severe Weather - Thunderstorms | 500 | 175,000 | Weather | ||
| 2012-06-29 | 6:24 PM | 7/6/2012 | 10:00 AM | West Virginia | RFC | Severe Weather - Thunderstorms | 700 | 265,000 | Weather | ||
| 2012-06-29 | 10:15 PM | 7/5/2012 | 12:52 PM | Montgomery and Prince Georges Counties, Maryland; District of Columbia | RFC | Severe Weather - Thunderstorms | 3,000 | 425,000 | Weather | ||
| 2012-06-29 | 10:43 PM | 7/5/2012 | 11:50 AM | Greater Baltimore area, Maryland | RFC | Severe Weather - Thunderstorms | 1,465 | 600,000 | Weather | ||
| 2012-06-29 | 10:29 PM | 7/4/2012 | 3:36 PM | Virginia | SERC | Severe Weather - Thunderstorms | 5,000 | 880,000 | Weather | ||
| 2012-06-29 | 4:00 PM | 7/2/2012 | 4:00 PM | Indiana; Michigan; Ohio; West Virginia | RFC | Severe Weather - Thunderstorms | UNK | 1,355,919 | Weather | ||
| 2012-06-29 | 5:15 PM | 7/2/2012 | 11:59 PM | Eastern Indiana; Northern Kentucky; Greater Cincinnati area Ohio | RFC | Severe Weather - Thunderstorms | 2,946 | 4,645,572 | Weather | ||
| 2012-06-30 | 3:00 PM | 7/2/2012 | 12:00 PM | Northeast Tennessee | SERC | Public Appeal to Reduce Electricity Usage | UNK | UNK | Public Appeal | ||
| 2012-06-30 | 10:30 PM | 7/2/2012 | 8:11 AM | Calvert, Charles, St. Mary's, Prince Georges Counties Maryland | RFC | Severe Weather - Thunderstorms | 354 | 60,000 | Weather | ||
| 2012-06-30 | 1:00 AM | 7/3/2012 | 1:00 AM | Delaware; Maryland | RFC | Severe Weather - Thunderstorms | 0 | 86,390 | Weather | ||
| 2012-06-30 | 1:15 AM | 7/7/2012 | 5:33 PM | Atlantic City Electric Service Territory New Jersey | RFC | Severe Weather - Thunderstorms | UNK | 205,000 | Weather | ||
| 2012-07-01 | 1:00 PM | 7/3/2012 | 3:00 PM | Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 320,000 | Weather | ||
| 2012-07-01 | 4:47 PM | 7/1/2012 | 11:00 PM | Tarboro, North Carolina | SERC | Operational Failure; Storm Damage | 48 | 6,100 | Weather | ||
| 2012-07-01 | 5:45 PM | 7/1/2012 | 10:15 PM | Northern, Central and Eastern North Carolina | SERC | Severe Weather | Unknown | 69,106 | Weather | ||
| 2012-07-05 | 12:00 AM | 7/6/2012 | 8:30 PM | Lower Peninsula Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 111,000 | Weather | ||
| 2012-07-05 | 7:00 PM | 7/6/2012 | 4:00 PM | Northeast Tennessee | SERC | Severe Weather - Wind & Storms | N/A | 50,001 | Weather | ||
| 2012-07-06 | 3:05 PM | 7/6/2012 | 3:06 PM | Tacoma, Washington | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-07-07 | 4:00 AM | 7/10/2012 | 4:00 AM | CAISO California | WECC | Fuel Supply Deficiency (Water) | Unknown | 0 | Fuel Supply Deficiency | ||
| 2012-07-07 | 6:06 AM | 7/9/2012 | 11:00 PM | Lower Valley, Central, Susquehanna Regions Pennsylvania | RFC | Severe Weather - Thunderstorms | N/A | 64,500 | Weather | ||
| 2012-07-07 | 6:00 PM | 7/9/2012 | 7:01 PM | Central and Northern New Jersey | RFC | Severe Weather - Thunderstorms | N/A | 95,400 | Weather | ||
| 2012-07-09 | 12:15 PM | 7/9/2012 | 4:14 PM | Alberta, Canada | WECC | Energy Deficiency Alert | 9896 | Unknown | Fuel Supply Deficiency | ||
| 2012-07-16 | 11:27 AM | 7/16/2012 | 12:29 PM | Little Rock, Arkansas | SPP | Public Appeal to Reduce Energy Usage | N/A | N/A | Public Appeal | ||
| 2012-07-18 | 2:16 PM | 7/19/2012 | 11:58 PM | Southeast Ohio, Northern Kentucky, Southern Indiana | RFC | Severe Weather - Thunderstorms | 480 | 103,000 | Weather | ||
| 2012-07-18 | 4:20 PM | 7/18/2012 | 7:05 PM | Eastern Ohio | RFC | Severe Weather - Thunderstorms | Unknown | 67,000 | Weather | ||
| 2012-07-18 | 11:00 PM | 7/19/2012 | 6:00 AM | Northern Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 181,000 | Weather | ||
| 2012-07-19 | 10:30 AM | 7/31/2012 | 11:00 AM | Niagara County, New York | NPCC | Fuel Supply Deficiency (Coal) | 675 | Unknown | Fuel Supply Deficiency | ||
| 2012-07-19 | 12:32 PM | 7/19/2012 | 12:33 PM | Newark, Delaware | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2012-07-21 | 2:19 AM | 7/21/2012 | 5:20 AM | City of Lubbock, Texas | SPP | Severe Weather; Equipment Failure | 220 | 70,000 | Weather | ||
| 2012-07-24 | 7:01 AM | 7/24/2012 | 4:30 PM | Northern Indiana | RFC | Severe Weather - Thunderstorms | N/A | 82,621 | Weather | ||
| 2012-07-24 | 7:30 AM | 7/24/2012 | 10:00 PM | Northern Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 330,000 | Weather | ||
| 2012-07-26 | 6:14 PM | 7/27/2012 | 6:14 PM | Western Pennsylvania | RFC | Severe Weather - Thunderstorms | N/A | 65,112 | Weather | ||
| 2012-07-26 | 6:21 PM | 7/28/2012 | 11:30 PM | North/Central Pennsylvania | RFC | Severe Weather - Thunderstorms | N/A | 65,000 | Weather | ||
| 2012-07-26 | 6:30 PM | 7/27/2012 | 5:22 PM | Eastern Ohio | RFC | Severe Weather - Thunderstorms | Unknown | 57,054 | Weather | ||
| 2012-07-27 | 5:19 PM | 7/28/2012 | 5:19 PM | Central Indiana | RFC | Severe Weather - Thunderstorms | Unknown | 52,702 | Weather | ||
| 2012-08-01 | 12:00 PM | 8/1/2012 | 12:00 PM | Oklahoma, Arkansas | SPP | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2012-08-04 | 3:55 AM | 8/4/2012 | 4:21 AM | Temblor Substation in McKittrick, California | WECC | Electrical System Separation (Islanding) | 5 | 127 | Islanding | ||
| 2012-08-04 | 4:00 AM | 8/4/2012 | 7:20 AM | Northern Indiana | RFC | Severe Weather - Thunderstorms | N/A | 61,413 | Weather | ||
| 2012-08-04 | 5:30 PM | 8/5/2012 | 12:10 PM | Northeast Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 325,000 | Weather | ||
| 2012-08-11 | 12:45 PM | 8/11/2012 | 5:00 PM | Tacoma, Washington | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-08-13 | 1:15 PM | 8/13/2012 | 1:15 PM | Knoxville, Tennessee | SERC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2012-08-13 | 3:52 PM | 8/13/2012 | 7:44 PM | CFE (Mexico & U.S.) | WECC | Severe Weather - Dust Storm; Load Shed Event | 655 | Unknown | Weather | ||
| 2012-08-16 | 1:13 PM | 8/16/2012 | 1:13 PM | Northern Indiana | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-08-19 | 8:42 AM | 8/19/2012 | 12:08 PM | El Paso, Texas | WECC | Suspected Physical Attack | 12 | 3,314 | Physical Attack | ||
| 2012-08-26 | 10:04 PM | 8/27/2012 | 2:04 AM | Florida | FRCC | Severe Weather - TS Isaac | N/A | 440,000 | Weather | ||
| 2012-08-28 | 6:00 AM | 9/4/2012 | 8:00 AM | Arkansas, Louisiana, Mississippi | SERC | Severe Weather - Hurricane Isaac | Unknown | 770,000 | Weather | ||
| 2012-08-29 | 6:53 AM | 8/30/2012 | 2:00 PM | Louisiana | SERC | Severe Weather - Hurricane Isaac | 150 | 68,018 | Weather | ||
| 2012-08-29 | 9:00 AM | 8/31/2012 | 12:00 PM | Louisiana | SERC | Severe Weather - Hurricane Isaac | 300 | 50,000 | Weather | ||
| 2012-08-29 | 9:48 AM | 8/31/2012 | 12:55 PM | Louisiana | SPP | Severe Weather - Hurricane Isaac | Unknown | 95,000 | Weather | ||
| 2012-09-05 | 10:56 AM | 9/5/2012 | 11:27 AM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | 0 | 0 | Islanding | ||
| 2012-09-06 | 4:45 AM | Ongoing | Ongoing | Oroville, California | WECC | Fuel Supply Deficiency (Water) | N/A | N/A | Fuel Supply Deficiency | ||
| 2012-09-07 | 9:30 PM | 9/8/2012 | 1:00 AM | Arkansas | SERC | Severe Weather - Thunderstorms | UNK | 64,951 | Weather | ||
| 2012-09-08 | 3:40 PM | 9/8/2012 | 6:45 PM | Prince George's County, Montgomery County Maryland; D.C. | RFC | Severe Weather - Thunderstorms | UNK | 65,000 | Weather | ||
| 2012-09-08 | 3:53 PM | 9/9/2012 | 7:46 PM | Virginia | SERC | Severe Weather - Thunderstorms | 475 | 119,000 | Weather | ||
| 2012-09-11 | 1:00 PM | 9/11/2012 | 1:58 PM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | 0 | 0 | Islanding | ||
| 2012-09-24 | 12:00 AM | 9/25/2012 | 12:00 AM | Brighton, Maryland | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-09-26 | 9:16 PM | 9/26/2012 | 10:18 PM | Puerto Rico | N/A | Voltage Reduction | 600 | 371,526 | ? | ||
| 2012-10-05 | 5:30 PM | 10/5/2012 | 5:50 PM | Greater Sacramento, California | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-10-09 | 12:00 AM | 10/9/2012 | 12:01 AM | Seat Pleasant, Maryland | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-11 | 12:00 AM | 10/11/2012 | 12:01 AM | Seat Pleasant, Maryland | RFC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-14 | 10:36 AM | 10/14/2012 | 10:50 AM | Northern California | WECC | Electrical System Separation (Islanding) | 3 | 2,035 | Islanding | ||
| 2012-10-15 | 2:15 PM | 10/15/2012 | 2:16 PM | Southeast Vermont | NPCC | Vandalism; Theft | 0 | 0 | Physical Attack | ||
| 2012-10-22 | 12:00 AM | 10/22/2012 | 12:01 AM | Norbeck, Maryland | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-23 | 9:10 AM | 10/23/2012 | 9:16 AM | Crawfordsville, Indiana | RFC | Transmission System Interruption | 49 | 9,800 | Transmission Interruption | ||
| 2012-10-24 | 12:00 AM | 10/24/2012 | 12:01 AM | Kingswood, Maryland | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-24 | 12:00 AM | 10/24/2012 | 12:01 AM | Brighton, Maryland | RFC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-10-24 | 3:15 PM | 10/24/2012 | 3:16 PM | Frankford, Delaware | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-25 | 12:00 AM | 10/25/2012 | 12:01 AM | West Lanham, Maryland | RFC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2012-10-25 | 2:39 PM | 10/25/2012 | 6:00 PM | Pueblo, Colorado | WECC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-25 | 6:51 PM | 10/25/2012 | 7:30 PM | Newark, Delaware | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-29 | 12:00 AM | 11/9/2012 | 11:59 PM | West Virginia | RFC | Severe Weather - Hurricane Sandy | 0 | 208,000 | Weather | ||
| 2012-10-29 | 8:00 AM | 11/4/2012 | 11:00 PM | New Jersey | RFC | Severe Weather - Hurricane Sandy | Unknown | Unknown | Weather | ||
| 2012-10-29 | 9:00 AM | 10/29/2012 | 9:01 AM | LaGrande, Washington | WECC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-29 | 9:00 AM | 11/2/2012 | 6:00 PM | Delaware, Maryland | RFC | Severe Weather - Hurricane Sandy | Unknown | 70,000 | Weather | ||
| 2012-10-29 | 12:00 PM | 11/4/2012 | 11:00 PM | New Jersey | RFC | Severe Weather - Hurricane Sandy | Unknown | 217,000 | Weather | ||
| 2012-10-29 | 1:00 PM | 11/12/2012 | 2:00 PM | Long Island, New York | NPCC | Severe Weather - Hurricane Sandy | 0 | 632,816 | Weather | ||
| 2012-10-29 | 2:40 PM | 10/30/2012 | 6:16 PM | Boston, Southeast Massachusetts | NPCC | Severe Weather - Hurricane Sandy | Unknown | 50,000 | Weather | ||
| 2012-10-29 | 2:45 PM | 11/1/2012 | 1:30 AM | Eastern Massachusetts | NPCC | Severe Weather - Hurricane Sandy | Unknown | 50,000 | Weather | ||
| 2012-10-29 | 3:00 PM | 10/29/2012 | 3:01 PM | Las Vegas, Nevada | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2012-10-29 | 3:15 PM | 11/4/2012 | 8:00 PM | Connecticut, Western Massachusetts | NPCC | Severe Weather - Hurricane Sandy | 0 | 649,075 | Weather | ||
| 2012-10-29 | 4:00 PM | 11/8/2012 | 5:08 PM | Maryland; West Virginia | RFC | Severe Weather - Hurricane Sandy | Unknown | 150,000 | Weather | ||
| 2012-10-29 | 4:00 PM | 11/7/2012 | 11:48 PM | Eastern Pennsylvania | RFC | Severe Weather - Hurricane Sandy | 0 | 270,000 | Weather | ||
| 2012-10-29 | 4:00 PM | 11/5/2012 | 11:59 PM | Greater Cleveland Ohio | RFC | Severe Weather - Hurricane Sandy | 0 | 346,000 | Weather | ||
| 2012-10-29 | 4:01 PM | 11/8/2012 | 7:00 PM | Greater New York City, New York | NPCC | Severe Weather - Hurricane Sandy | 0 | 818,000 | Weather | ||
| 2012-10-29 | 4:03 PM | 11/6/2012 | 12:00 PM | New Jersey | NPCC | Severe Weather - Hurricane Sandy | Unknown | 50,000 | Weather | ||
| 2012-10-29 | 4:45 PM | 10/31/2012 | 11:00 AM | New Hampshire | NPCC | Severe Weather - Hurricane Sandy | N/A | 50,000 | Weather | ||
| 2012-10-29 | 5:13 PM | 10/31/2012 | 11:00 AM | Greater Baltimore Maryland | RFC | Severe Weather - Hurricane Sandy | 0 | 219,000 | Weather | ||
| 2012-10-29 | 5:30 PM | 11/6/2012 | 12:00 AM | Greater Philadelphia Pennsylvania | RFC | Severe Weather - Hurricane Sandy | Unknown | 850,000 | Weather | ||
| 2012-10-29 | 6:11 PM | 11/4/2012 | 10:50 PM | Central Pennsylvania | RFC | Severe Weather - Hurricane Sandy | Unknown | 400,000 | Weather | ||
| 2012-10-29 | 6:12 PM | 10/30/2012 | 7:35 PM | Virginia | RFC | Severe Weather - Hurricane Sandy | 520 | 156,000 | Weather | ||
| 2012-10-29 | 6:46 PM | 11/3/2012 | 10:45 AM | Southeast New York; New Jersey | NPCC; RFC | Severe Weather - Hurricane Sandy | Unknown | 200,000 | Weather | ||
| 2012-10-29 | 6:48 PM | 11/4/2012 | 11:36 AM | New York | NP | Severe Weather - Hurricane Sandy | Unknown | 371,000 | Weather | ||
| 2012-10-29 | 7:00 PM | 11/2/2012 | 5:00 AM | Indiana; Kentucky; Michigan; Ohio | RFC; SERC | Severe Weather - Nor'easter | Unknown | 173,273 | Weather | ||
| 2012-10-29 | 7:15 PM | 10/30/2012 | 3:02 PM | Southeast and Seacoast Maine | NPCC | Severe Weather - Hurricane Sandy | Unknown | 50,000 | Weather | ||
| 2012-10-30 | 12:00 AM | 10/30/2012 | 12:02 AM | Hyattsville, Maryland | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-30 | 2:00 AM | 11/1/2012 | 10:00 PM | Greater Detroit Michigan | RFC | Severe Weather - Nor'easter | Unknown | 133,777 | Weather | ||
| 2012-10-30 | 1:20 PM | 10/30/2012 | 1:25 PM | Fitzwilliam, New Hampshire | NPCC | Vandalism | 0 | 0 | Physical Attack | ||
| 2012-10-30 | 3:00 PM | 10/30/2012 | 3:01 PM | Pueblo, Colorado | WECC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2012-11-02 | 9:30 AM | 11/2/2012 | 12:10 PM | Concord, Vermont | NPCC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-11-07 | 2:21 PM | 11/7/2012 | 2:48 PM | New Hampshire | NPCC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-11-08 | 9:34 AM | 11/8/2012 | 9:35 AM | Bishopville, Maryland | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-11-15 | 9:09 PM | 11/15/2012 | 9:26 PM | Iowa; Michigan | MRO | Suspected Cyber Attack | Unknown | Unknown | Cyber Attack | ||
| 2012-11-15 | 5:38 AM | 11/15/2012 | 5:39 AM | Southeast Massachusetts | NPCC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-11-17 | 10:00 AM | 11/18/2012 | 10:00 AM | Comanche Peak, Texas | TRE | Fuel Supply Deficiency | 1,231 | 0 | Fuel Supply Deficiency | ||
| 2012-11-21 | 2:50 PM | 11/21/2012 | 2:51 PM | Bethany Beach, Delaware | RFC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2012-11-26 | 12:37 PM | 11/26/2012 | 12:38 PM | Frankfort, Delaware | RFC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-11-26 | 3:07 PM | 11/26/2012 | 3:08 PM | Georgetown, Delaware | RFC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2012-11-27 | 1:07 PM | 11/27/2012 | 1:40 PM | New Hampshire | NPCC | Physical Attack; Vandalism | 0 | 0 | Physical Attack | ||
| 2012-12-02 | 5:20 AM | 12/4/2012 | 9:00 AM | Northern California | WECC | Severe Weather - Winter Storm | 250 | 125,000 | Weather | ||
| 2012-12-03 | 12:02 PM | 12/3/2012 | 12:30 PM | Tacoma, Washington | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-12-06 | 9:18 PM | 12/6/2012 | 9:31 PM | Greater San Jose, California | WECC | Load Shed | 390 | Unknown | Load Shed | ||
| 2012-12-17 | 6:55 AM | 12/17/2012 | 7:00 AM | Tacoma, Washington | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2012-12-25 | 12:45 AM | 12/28/2012 | 4:15 PM | Arkansas; Louisiana; Mississippi; Texas | SPP | Severe Weather - Winter Storm | Unknown | 242,509 | Weather | ||
| 2012-12-25 | 9:28 AM | 12/26/2012 | 4:28 PM | Houston, Texas | TRE | Severe Weather - Cold Front, High Winds | 294 | 262,000 | Weather | ||
| 2012-12-26 | 2:50 PM | 12/26/2012 | 7:40 PM | Stantonsburg, North Carolina | SERC | Severe Weather - Thunderstorm | 3 | 1,200 | Weather | ||
| 2012-12-31 | 2:21 PM | 12/31/2012 | 4:30 PM | North Carolina | SERC | Transmission Interruption | 40 | 12,000 | Transmission Interruption | ||
| 2013-01-07 | 10:43 AM | 1/7/2013 | 10:43 AM | Denton, Maryland | RFC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-01-16 | 4:45 PM | 1/16/2013 | 7:26 PM | San Juan County, New Mexico | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2013-01-16 | 7:41 AM | 1/17/2013 | 10:58 AM | Webster County, Iowa | MRO | Physical Attack | N/A | N/A | Physical Attack | ||
| 2013-01-16 | 2:25 PM | 1/16/2013 | 2:25 PM | Denton, Maryland | RFC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-01-17 | 8:35 PM | 1/17/2013 | 9:20 PM | Elizabeth City, North Carolina | SERC | Distribution Interruption | 40 | 12,000 | Distribution Interruption | ||
| 2013-01-17 | 7:02 PM | 1/19/2013 | 6:00 PM | Northeast Tennessee | SERC | Severe Weather - Winter Storm | Unknown | 80,000 | Weather | ||
| 2013-01-17 | 6:07 PM | 1/20/2013 | 7:30 PM | Southwest Virginia, Southern West Virginia | RFC | Severe Weather - Winter Storm | Unknown | 127,000 | Weather | ||
| 2013-01-20 | 3:30 AM | 1/23/2013 | 6:15 AM | Southeastern Michigan | RFC | Severe Weather - Wind Storm | Unknown | 146,500 | Weather | ||
| 2013-01-28 | 4:46 PM | 1/28/2013 | 6:00 PM | Tacoma Narrows Crossing, Washington | WECC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-01-31 | 6:30 AM | 1/31/2013 | 10:00 AM | Connecticut | NPCC | Severe Weather - Wind Storm | 75 | 75,000 | Weather | ||
| 2013-01-31 | 3:05 AM | 1/31/2013 | 4:48 AM | Central and Eastern Virginia | SERC | Severe Weather - Wind Storm | 188 | 119,000 | Weather | ||
| 2013-02-02 | 9:15 PM | 2/2/2013 | 10:15 PM | El Paso, New Mexico | WECC | Vandalism | N/A | N/A | Physical Attack | ||
| 2013-02-07 | 8:32 AM | 2/7/2013 | 9:47 AM | Cincinnati, Ohio | RFC | Vandalism | Unknown | 0 | Physical Attack | ||
| 2013-02-08 | 11:38 AM | 2/8/2013 | 2:17 PM | District of Columbia; Prince George's County Maryland | RFC | Equipment Trip & Failure | 140 | 52,000 | Equipment | ||
| 2013-02-08 | 8:00 PM | 2/11/2013 | 8:30 PM | Central and eastern Massachusetts; Rhode Island | NPCC | Severe Weather - Winter Storm Nemo | N/A | 50,000 | Weather | ||
| 2013-02-08 | 8:55 PM | 2/12/2013 | 4:00 AM | Boston area and Southeast Massachusetts | NPCC | Severe Weather - Winter Storm Nemo | Unknown | 50,000 | Weather | ||
| 2013-02-09 | 8:30 AM | 2/9/2013 | 3:00 PM | El Paso, New Mexico | WECC | Vandalism; Equipment Fault | Unknown | Unknown | Physical Attack | ||
| 2013-02-10 | 7:46 PM | 2/10/2013 | 8:15 PM | Puerto Rico | N/A | Generator Trip; Voltage Reduction | 350 | Unknown | Equipment | ||
| 2013-02-13 | 5:39 PM | 2/15/2013 | 5:50 PM | Eastern Massachusetts | NPCC | Fuel Supply Emergency - Petroleum | 1 | 1 | Fuel Supply Deficiency | ||
| February | 2013-02-13 | 9:30 AM | 2/13/2013 | 9:30 AM | Fort Washington, Maryland | RFC | Vandalism | 1 | 1 | Physical Attack | |
| 2013-02-15 | 12:00 AM | 2/15/2013 | 12:01 AM | Tuxedo, Maryland | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| February | 2013-02-16 | 7:54 AM | 2/16/2013 | 7:54 AM | Prince George's County Maryland | RFC | Vandalism | 1 | 1 | Physical Attack | |
| 2013-02-19 | 4:01 PM | 2/20/2013 | 12:55 PM | Stockton, California | WECC | Electrical System Separation (Islanding) | 13,850 | 6,810 | Islanding | ||
| 2013-02-21 | 11:00 AM | 2/21/2013 | 11:30 AM | Las Cruces, New Mexico | WECC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-02-26 | 1:00 PM | 3/1/2013 | 10:00 AM | Northern Missouri | SERC | Severe Weather - Winter Storm Nemo | Unknown | 56,444 | Weather | ||
| 2013-03-03 | 4:27 PM | 3/3/2013 | 6:20 PM | Tacoma Park, Maryland | RFC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-03-03 | 6:39 AM | 3/3/2013 | 10:29 AM | Merced County, California | WECC | Transmission System Interruption | 300 | 58,850 | Transmission Interruption | ||
| 2013-03-04 | 9:49 AM | 3/4/2013 | 10:00 PM | Metropolitan area Puerto Rico | N/A | Equipment Failure; Transmission System Interruption | Unknown | Unknown | Transmission Interruption | ||
| 2013-03-06 | 8:22 AM | 3/7/2013 | 10:27 AM | Northwest Virginia | SERC | Severe Weather - Winter Storm | 400 | 233,000 | Weather | ||
| 2013-03-18 | 5:21 AM | 3/18/2013 | 5:41 AM | Systemwide Puerto Rico | N/A | Generator Trip; Load Shed | 350 | 262,937 | Equipment | ||
| 2013-03-18 | 5:50 PM | 3/18/2013 | 6:07 PM | Northeast Florida | FRCC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2013-03-18 | 7:30 PM | 3/20/2013 | 2:30 PM | North/Central Alabama; Georgia | SERC | Severe Weather - Thunderstorms | 800 | 240,000 | Weather | ||
| 2013-03-23 | 7:00 AM | 3/23/2013 | 9:00 AM | Connecticut | NPCC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-03-27 | 10:25 AM | 3/27/2013 | 12:19 PM | Western Massachusetts | NPCC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-03-28 | 1:01 PM | 3/28/2013 | 1:02 PM | Wilmington, Delaware | RFC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-03-29 | 10:16 AM | 3/29/2013 | 10:17 AM | Maryland | RFC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-04-01 | 8:40 AM | 4/1/2013 | 8:41 AM | Connecticut | NPCC | Vandalism - Copper Wire Theft | Unknown | Unknown | Physical Attack | ||
| 2013-04-03 | 11:05 AM | 4/3/2013 | 2:00 PM | Colorado Springs, Colorado | WECC | Sabotage; Vandalism | 0 | 0 | Physical Attack | ||
| 2013-04-09 | 11:30 AM | 4/9/2013 | 11:31 AM | Delaware City, Delaware | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2013-04-16 | 1:47 AM | 4/18/2013 | 3:25 PM | California | WECC | Loss of Part of a High Voltage Substation, Physical Attack | N/A | 0 | Physical Attack | ||
| 2013-04-17 | 3:36 PM | 4/17/2013 | 4:53 PM | Colbert Steam Plant in Cherokee, Alabama | SERC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-04-18 | 3:00 PM | 4/21/2013 | 3:30 AM | Southeast Michigan, Michigan | RFC | Severe Weather - Storms and Wind | Unknown | 99,188 | Weather | ||
| 2013-04-21 | 2:11 AM | 4/21/2013 | 12:30 PM | East Tennessee | SERC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2013-04-23 | 12:49 AM | 4/23/2013 | 4:04 AM | South of Humboldt, California | WECC | Electrical System Separation (Islanding) | 80 | 1 | Islanding | ||
| 2013-04-23 | 11:00 AM | 4/23/2013 | 11:01 AM | Newark, Delaware | RFC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-04-25 | 4:00 PM | 4/26/2013 | 10:55 AM | Sunol, California | WECC | Vandalism | 0 | 0 | Physical Attack | ||
| 2013-05-01 | 9:22 AM | 5/1/2013 | 9:24 AM | Northeast Colorado | WECC | Electrical System Separation (Islanding) | 123 | 35,230 | Islanding | ||
| 2013-05-02 | 6:52 AM | 5/2/2013 | 10:07 AM | Unknown | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2013-05-09 | 1:21 PM | 5/9/2013 | 4:21 PM | Alberta, Canada; Washington State | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2013-05-13 | 12:52 PM | Ongoing | Ongoing | Central California | WECC | Fuel Supply Emergency - Hydro | 176 | Unknown | Fuel Supply Deficiency | ||
| 2013-05-14 | 12:01 AM | 5/14/2013 | 1:59 PM | Portland, Oregon | WECC | Vandalism/Theft | N/A | N/A | Physical Attack | ||
| 2013-05-14 | 10:25 AM | 5/14/2013 | 11:42 AM | New Hampshire | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2013-05-15 | 2:11 PM | 5/15/2013 | 2:12 PM | Wilmington, Delaware | RFC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-05-17 | 8:35 AM | 5/17/2013 | 8:36 AM | Newcastle, Delaware | RFC | Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-05-20 | 5:22 PM | 5/20/2013 | 9:09 PM | Gonzales Area Louisiana | SERC | Generator Trip; Load Shed 100+ MW | 103 | 21,800 | Equipment | ||
| 2013-05-20 | 3:00 PM | 5/22/2013 | 5:00 PM | Moore, Oklahoma | SPP | Severe Weather - Tornadoes | Unknown | 41,306 | Weather | ||
| 2013-05-22 | 10:51 AM | 5/22/2013 | 10:57 AM | System wide Puerto Rico | N/A | System Wide Voltage Reduction | 280 | 197,287 | ? | ||
| 2013-05-28 | 1:00 PM | 5/28/2013 | 6:00 PM | Maine | NPCC | Vandalism/Theft | None | None | Physical Attack | ||
| 2013-05-29 | 9:52 AM | 5/29/2013 | 9:53 AM | Wilmington, Delaware | RFC | Vandalism/Theft | N/A | N/A | Physical Attack | ||
| 2013-05-29 | 12:00 AM | 5/29/2013 | 12:02 AM | Henrico County, Virginia | SERC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-05-29 | 8:58 PM | 5/31/2013 | 2:53 PM | Central and Eastern New York | NPCC | Severe Weather - Thunderstorms | Unknown | 61,795 | Weather | ||
| 2013-05-30 | 10:15 AM | 5/30/2013 | 10:16 AM | Saranac, New York | NPCC | Vandalism | N/A | N/A | Physical Attack | ||
| 2013-05-31 | 7:07 PM | 6/1/2013 | 2:15 PM | Southeast Kansas, Northeast Oklahoma | MRO | Transmission System Interruption | 102 | 6,300 | Transmission Interruption | ||
| 2013-05-31 | 7:30 PM | 6/1/2013 | 8:00 PM | St. Louis Metro Area Missouri | SERC | Severe Weather - Thunderstorms | Unknown | 100,000 | Weather | ||
| 2013-05-31 | 6:00 PM | 6/4/2013 | 10:30 AM | El Reno, S. Oklahoma City, Oklahoma | SPP | Severe Weather - Tornadoes | Unknown | 127,000 | Weather | ||
| 2013-05-31 | 1:00 AM | 5/31/2013 | 1:30 AM | Maumelle, Arkansas | SPP | Severe Weather - Lightning | N/A | N/A | Weather | ||
| 2013-06-03 | 12:50 PM | 6/3/2013 | 1:36 PM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2013-06-13 | 3:30 PM | 6/13/2013 | 4:00 PM | District of Columbia; Maryland | RFC | Loss of 300+ MW Load; Severe Weather - Thunderstorms | 700 | 40,000 | Weather | ||
| 2013-06-13 | 5:45 PM | 6/14/2013 | 6:30 PM | Central and Eastern North Carolina | SERC | Severe Weather - Thunderstorms | Unknown | 53,000 | Weather | ||
| 2013-06-13 | 3:20 PM | 6/14/2013 | 9:10 PM | Ohio; Virginia; West Virginia | RFC; SERC | Severe Weather - Thunderstorms | Unknown | 90,247 | Weather | ||
| 2013-06-13 | 8:47 PM | 6/14/2013 | 10:47 PM | Southern Company Territory | SERC | Severe Weather - Thunderstorms | 550 | 165,798 | Weather | ||
| 2013-06-13 | 1:17 PM | 6/14/2013 | 5:35 PM | Western Piedmont North Carolina | SERC | Severe Weather - Thunderstorms | 1,000 | 175,000 | Weather | ||
| 2013-06-13 | 4:08 PM | 6/14/2013 | 5:16 PM | Richmond Metro area, Virginia | SERC | Severe Weather - Thunderstorms | 900 | 283,000 | Weather | ||
| 2013-06-17 | 4:17 PM | 6/17/2013 | 6:49 PM | Hillsborough County Florida | FRCC | Load Shed of 100+ MW Under Emergency Operational Policy | 180 | 37 | Load Shed | ||
| 2013-06-18 | 3:51 PM | 6/18/2013 | 4:23 PM | Wyoming | WECC | Electrical System Separation (Islanding) | 6 | Unknown | Islanding | ||
| 2013-06-19 | 7:57 PM | 6/19/2013 | 8:09 PM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2013-06-20 | 6:00 PM | 6/21/2013 | 10:00 AM | Richie Station (No. 123), Maryland | RFC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-06-21 | 8:31 AM | 10/30/2013 | 2:09 PM | Michigan, Iowa | MRO | Suspected Cyber Attack | Unknown | Unknown | Cyber Attack | ||
| 2013-06-21 | 7:40 AM | 6/21/2013 | 12:14 PM | Pahrump Nevada | WECC | Physical Attack; Vandalism & Sabotage | Unknown | 1,100 | Physical Attack | ||
| 2013-06-21 | 11:14 PM | 6/21/2013 | 11:15 PM | New Castle Delaware | RFC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-06-21 | 3:00 AM | 6/26/2013 | 12:00 PM | Minnesota | MRO | Severe Weather - Hailstorm | Unknown | 193,000 | Weather | ||
| 2013-06-21 | 5:39 PM | 6/24/2013 | 6:00 AM | Minneapolis/St. Paul area Minnesota | MRO | Severe Weather - Hailstorm | Unknown | 400,000 | Weather | ||
| 2013-06-22 | 4:59 AM | 6/22/2013 | 9:28 PM | Medford Oregon | WECC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2013-06-22 | 4:12 PM | 6/22/2013 | 5:45 PM | Eastern Montana | WECC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-06-23 | 9:20 PM | 6/24/2013 | 1:35 AM | Central Coast California | WECC | Severe Weather - Fog | Unknown | 148,000 | Weather | ||
| 2013-06-24 | 7:30 PM | 6/26/2013 | 5:00 PM | Indiana | RFC | Severe Weather - Thunderstorms | Unknown | 86,615 | Weather | ||
| 2013-06-24 | 7:30 PM | 6/25/2013 | 5:46 PM | Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 283,451 | Weather | ||
| 2013-06-27 | 1:10 AM | 6/27/2013 | 2:45 AM | Richie Substation,Seat Pleasant, Maryland | RFC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-06-27 | 5:00 PM | 6/28/2013 | 12:00 AM | South Eastern Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 138,000 | Weather | ||
| 2013-06-28 | 6:02 PM | 6/28/2013 | 8:46 PM | Los Angeles and Orange Counties, California | WECC | Equipment Failure | 240 | 65,255 | Equipment | ||
| 2013-06-28 | 1:00 PM | 6/28/2013 | 1:01 PM | Vermont | NPCC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-06-28 | 5:14 PM | 6/28/2013 | 5:15 PM | New Castle Delaware | RFC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-07-02 | 2:20 PM | 7/5/2013 | 3:30 PM | Alberta, Canada | WECC | Load Shed 100+MW | 200 | Unknown | Load Shed | ||
| 2013-07-03 | 12:04 PM | 7/3/2013 | 12:48 PM | System-wide Puerto Rico | N/A | Voltage Reduction; Line and Generator Trip | 480 | 393,000 | Equipment | ||
| 2013-07-03 | 9:34 AM | 7/3/2013 | 10:52 AM | Sacramento California | WECC | Suspected Physical Attack | 0 | 0 | Physical Attack | ||
| 2013-07-05 | 12:05 AM | 7/5/2013 | 1:51 AM | California | WECC | Physical Attack; Vandalism | Unknown | 2,500 | Physical Attack | ||
| 2013-07-10 | 2:30 PM | 7/10/2013 | 2:45 PM | Boston, Massachusetts | NPCC | Physical Attack; Copper Theft | 0 | 0 | Physical Attack | ||
| 2013-07-10 | 5:30 PM | 7/11/2013 | 8:00 PM | AEP Ohio Power Footprint | RFC | Severe Weather - Thunderstorms | N/A | 122,314 | Weather | ||
| 2013-07-11 | 11:20 PM | 7/14/2013 | 3:22 PM | Arizona | WECC | Physical Attack; Vandalism | 455 | Unknown | Physical Attack | ||
| 2013-07-12 | 10:00 AM | 7/12/2013 | 10:01 AM | Washington | WECC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-07-17 | 3:30 PM | 7/19/2013 | 6:45 AM | Holtsville, New York | NPCC | Fuel Supply Emergency (Natural Gas) | 417 | Unknown | Fuel Supply Deficiency | ||
| 2013-07-18 | 11:45 PM | 7/19/2013 | 10:05 AM | Southern Orange County California | WECC | Equipment Failure | 200 | 123,000 | Equipment | ||
| 2013-07-18 | 3:15 AM | 7/18/2013 | 3:59 AM | Utah | WECC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2013-07-18 | 11:30 AM | 7/19/2013 | 5:30 PM | Upstate New York | NPCC | Public Appeal - Heatwave | Unknown | Unknown | Weather | ||
| 2013-07-19 | 10:30 PM | 7/21/2013 | 8:00 PM | New York | NPCC | Severe Weather - Thunderstorms | Unknown | 74,300 | Weather | ||
| 2013-07-19 | 6:00 PM | 7/20/2013 | 9:00 AM | Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 156,627 | Weather | ||
| 2013-07-22 | 7:00 AM | 7/22/2013 | 3:00 PM | California | WECC | Physical Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-07-23 | 11:38 PM | 7/25/2013 | 4:30 AM | Tulsa, Oklahoma | SPP | Severe Weather - Thunderstorms | 500 | 92,748 | Weather | ||
| 2013-07-25 | 1:10 PM | 7/25/2013 | 1:15 PM | Polk Substation, Tacoma Washington | WECC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2013-08-01 | 11:19 PM | 8/2/2013 | 12:49 AM | Daytona Beach Florida | FRCC | Loss of 300+ MW Load | 297 | 104,498 | ? | ||
| 2013-08-01 | 6:54 PM | 8/1/2013 | 7:37 PM | Western British Columbia | WECC | Electrical System Separation (Islanding | 420 | Unknown | Islanding | ||
| 2013-08-01 | 11:00 AM | 8/1/2013 | 4:00 PM | Newburgh, New York | NPCC | Physical Attack; Copper Theft | N/A | N/A | Physical Attack | ||
| 2013-08-04 | 3:00 AM | 8/4/2013 | 4:00 AM | Utah | WECC | Physical Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2013-08-05 | 6:35 PM | 8/5/2013 | 6:45 PM | Vancouver, British Columbia | WECC | Electrical System Separation (Islanding); Severe Weather | Unknown | Unknown | Islanding | ||
| 2013-08-06 | 4:00 PM | 8/6/2013 | 5:32 PM | Holloman Air Force Base, New Mexico | WECC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-08-07 | 7:30 AM | 8/7/2013 | 9:14 AM | Green Bay, Wisconsin | MRO | Fuel Supply Emergency (Natural Gas & Fuel Oil) | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2013-08-07 | 2:30 PM | 8/8/2013 | 1:00 PM | Arlington, Oregon | WECC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-08-07 | 12:15 AM | 8/7/2013 | 9:27 PM | Eastern Central Wisconsin | MRO | Severe Weather - Thunderstorms | 220 | 51,160 | Weather | ||
| 2013-08-12 | 11:55 AM | 8/12/2013 | 11:59 AM | Portland, Oregon | WECC | Suspicious Activity | Unknown | Unknown | Physical Attack | ||
| 2013-08-16 | 4:58 PM | 8/17/2013 | 11:58 PM | Houston Service Area Texas | TRE | Severe Weather - Thunderstorms | Unknown | 219,681 | Weather | ||
| 2013-08-19 | 7:06 PM | 8/20/2013 | 6:02 AM | Central California | WECC | Severe Weather - Lightning Strike | 685 | 124,000 | Weather | ||
| 2013-08-21 | 2:00 PM | 8/21/2013 | 2:01 PM | Cabot, Arkansas | SERC | Physcial Attack; Sabotage | N/A | N/A | Physical Attack | ||
| 2013-08-22 | 8:40 AM | 8/22/2013 | 11:49 AM | Gila River, Arizona | WECC | Physcial Attack; Sabotage | N/A | N/A | Physical Attack | ||
| 2013-08-22 | 12:55 PM | 8/22/2013 | 2:45 PM | New Castle, Delaware | RFC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-08-23 | 7:30 AM | 8/23/2013 | 7:31 AM | New Castle, Delaware | RFC | Physcial Attack; Vandalism | Unknown | N/A | Physical Attack | ||
| 2013-08-26 | 8:15 PM | 8/26/2013 | 8:16 PM | Tacoma Washington | WECC | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-08-28 | 9:30 AM | 8/28/2013 | 9:31 AM | Sweetwater County Wyoming | WECC | Physcial Attack; Vandalism | N/A | N/A | Physical Attack | ||
| 2013-08-29 | 2:57 PM | 8/29/2013 | 3:29 PM | Ashland, Wisconsin | MRO | Electrical System Separation (Islanding); Severe Weather | 15 | 7,000 | Islanding | ||
| 2013-08-29 | 9:50 AM | 8/29/2013 | 9:50 AM | Joplin, Missouri | N/A | Physcial Attack; Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-08-30 | 7:30 PM | 8/31/2013 | 1:30 AM | Entire ComEd territory Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 157,000 | Weather | ||
| 2013-09-10 | 5:42 PM | 9/11/2013 | 12:02 AM | Erie, Pennsylvania | RFC | Load Shed of 100+ MW | 105 | Unknown | Load Shed | ||
| 2013-09-11 | 4:00 PM | 9/15/2013 | 4:00 PM | Southeastern Michigan | RFC | Severe Weather - Thunderstorms | 400 | 75,000 | Weather | ||
| 2013-09-29 | 12:00 AM | 9/29/2013 | 1:00 AM | Cabot Arkansas | SERC | Physcial Attack; Sabotage | Unknown | Unknown | Physical Attack | ||
| 2013-10-06 | 7:25 AM | 10/6/2013 | 9:15 AM | Jacksonville, Arkansas | SPP | Physical Attack | Unknown | 9,200 | Physical Attack | ||
| 2013-10-11 | 2:30 PM | 10/11/2013 | 6:30 PM | Keo, Arkansas | SERC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-10-16 | 11:15 AM | 10/16/2013 | 6:00 PM | Roxboro Plant, North Carolina | SERC | Cyber Event with Potential to Cause Impact | 0 | 0 | Cyber Attack | ||
| 2013-10-19 | 2:32 PM | 10/19/2013 | 10:00 PM | California | WECC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-10-21 | 5:18 AM | 10/21/2013 | 5:33 AM | Location Unknown | WECC | Electrical System Separation (Islanding) | 115 | 433 | Islanding | ||
| 2013-10-26 | 7:13 AM | 10/26/2013 | 7:14 AM | Arizona | WECC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-10-27 | 4:27 AM | 10/27/2013 | 10:27 PM | Houston, Texas | TRE | Severe Weather - Hailstorm | Unknown | 171,117 | Weather | ||
| 2013-11-01 | 1:26 PM | 11/1/2013 | 1:27 PM | Wilmington, Delaware | RFC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-11-02 | 8:25 AM | 11/2/2013 | 8:26 AM | Salt Lake City, Utah | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2013-11-02 | 12:00 AM | 11/4/2013 | 6:00 AM | King, Whatcom, and Skagit, Washington | WECC | Severe Weather - Heavy Winds | Unknown | 105,000 | Weather | ||
| 2013-11-04 | 9:04 AM | 11/4/2013 | 9:05 AM | Connecicut | NPCC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-11-05 | 10:10 AM | 11/7/2013 | 10:10 AM | Indiana | RFC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-11-12 | 9:14 AM | 11/12/2013 | 10:30 AM | Eastern Central New Mexico | SPP | Loss of Power from Wholesale Provider; Major Distribution Disruption | Unknown | Unknown | Distribution Interruption | ||
| 2013-11-12 | 2:04 PM | 11/12/2013 | 2:05 PM | Valle, California | WECC | Electrical System Separation (Islanding) | 55 | 48,400 | Islanding | ||
| 2013-11-16 | 3:15 PM | 11/16/2013 | 3:16 PM | Salt Lake County, Utah | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2013-11-17 | 12:35 PM | 11/17/2013 | 1:40 PM | Rochelle, Indiana | RFC | System-wide voltage reductions of 3 percent or more | 38 | 7,500 | ? | ||
| 2013-11-17 | 4:45 PM | 11/21/2013 | 4:45 PM | Entire Lower Peninsula Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 50,000 | Weather | ||
| 2013-11-17 | 4:47 PM | 11/20/2013 | 4:47 PM | Central Indiana | RFC | Severe Weather - Thunderstorms | Unknown | 61,705 | Weather | ||
| 2013-11-17 | 4:47 PM | 11/20/2013 | 11:59 AM | Central Indiana | RFC | Severe Weather - Tornadoes | 535 | 61,705 | Weather | ||
| 2013-11-17 | 1:06 PM | 11/20/2013 | 1:06 PM | North Central Indiana | RFC | Severe Weather - Thunderstorms | Unknown | 75,065 | Weather | ||
| 2013-11-17 | 4:19 PM | 11/18/2013 | 6:00 PM | Indiana, Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 77,346 | Weather | ||
| 2013-11-17 | 2:31 PM | 11/17/2013 | 10:30 PM | Entire ComEd Territory Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 190,000 | Weather | ||
| 2013-11-17 | 12:35 PM | 11/20/2013 | 11:00 AM | Central Missouri, Central Illinois | SERC | Severe Weather - Tornadoes | Unknown | 200,000 | Weather | ||
| 2013-11-17 | 7:00 AM | 11/20/2013 | 6:54 PM | Michigan | RFC | Severe Weather - Ice and Snow Storm | Unknown | 325,325 | Weather | ||
| 2013-11-20 | 3:08 AM | 11/20/2013 | 3:09 AM | Salt Lake County Utah | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2013-11-21 | 7:45 PM | 11/22/2013 | 3:20 AM | Northern California | WECC | Severe Weather - Wind Storm | 150 | 89,500 | Weather | ||
| 2013-11-24 | 7:38 AM | 11/24/2013 | 7:39 AM | Salt Lake County Utah | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2013-12-04 | 5:00 AM | 12/4/2013 | 4:17 PM | Idaho Falls Area Idaho, Utah-Idaho Border Utah | WECC | Load Shed 100+ MW | 150 | Unknown | Load Shed | ||
| 2013-12-06 | 8:47 AM | 12/6/2013 | 8:49 AM | Saratoga, Utah | WECC | Physical Attack - Vandalism, Theft | N/A | N/A | Physical Attack | ||
| 2013-12-06 | 1:51 AM | 12/11/2013 | 12:00 PM | Greater Houston, Texas | TRE | Severe Weather - Ice/Snow | Unknown | 881,000 | Weather | ||
| 2013-12-09 | 6:54 AM | 12/9/2013 | 2:22 PM | Virginia Service Territory | SERC | Severe Weather - Ice/Snow | 293 | 88,000 | Weather | ||
| 2013-12-10 | 1:01 AM | 12/11/2013 | 1:01 AM | Arizona | WECC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2013-12-13 | 11:00 AM | 12/27/2013 | 11:00 AM | Texas | TRE | Fuel Supply Emergencies (Coal) | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2013-12-13 | 11:00 AM | 12/27/2013 | 11:00 AM | Texas | TE | Fuel Supply Emergencies (Coal) | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2013-12-22 | 3:28 AM | 12/28/2013 | 11:45 PM | Southern Lower Penninsula, Michigan | RFC | Severe Weather - Ice/Snow | Unknown | 50,000 | Weather | ||
| 2013-12-22 | 6:16 AM | 12/24/2013 | 11:59 PM | Frontier/Genesee/Northern New York | NPCC | Severe Weather - Ice/Snow | Unknown | 59,000 | Weather | ||
| 2013-12-22 | 6:30 AM | 12/25/2013 | 5:12 AM | Michigan | RFC | Severe Weather - Ice/Snow | 350 | 140,735 | Weather | ||
| 2013-12-23 | 3:20 PM | 12/25/2013 | 11:32 AM | Central Maine Maine | NPCC | Severe Weather - Ice/Snow | Unknown | 52,500 | Weather | ||
| 2013-12-27 | 9:43 AM | 12/27/2013 | 12:43 PM | Gilabend Arizona | WECC | Physical Attack | N/A | N/A | Physical Attack | ||
| 2013-12-30 | 11:00 AM | 12/30/2013 | 11:01 AM | Salt Lake County Utah | WECC | Physical Attack | N/A | N/A | Physical Attack | ||
| 2013-12-30 | 11:00 AM | 1/1/2014 | 8:00 AM | North of Roosevelt lake Arizona | WECC | Physical Attack | N/A | N/A | Physical Attack | ||
| 2014-01-06 | 2:37 PM | 1/6/2014 | 2:38 PM | Utah | RFC | Vandalism | N/A | N/A | Physical Attack | ||
| 2014-01-06 | 7:01 AM | 1/7/2014 | 9:00 AM | Texas | TRE | Public Appeal due to Severe Weather - Cold | N/A | N/A | Public Appeal | ||
| 2014-01-06 | 8:45 PM | 1/7/2014 | 9:00 PM | Unknown | RFC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Public Appeal | ||
| 2014-01-06 | 10:00 PM | 1/6/2014 | 10:01 PM | Kentucky | RFC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Public Appeal | ||
| 2014-01-06 | 7:50 PM | 1/6/2014 | 8:49 PM | Pennsylvania | RFC | Voltage Reduction due to Severe Weather - Cold | 200 | 62,000 | Weather | ||
| 2014-01-06 | 7:50 PM | 1/6/2014 | 8:44 PM | District of Columbia | RFC | Voltage Reduction due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-06 | 7:50 PM | 1/6/2014 | 8:44 PM | Unknown | RFC | Voltage Reduction due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-06 | 7:50 PM | 1/6/2014 | 8:44 PM | Pennsylvania | RFC | Voltage Reduction due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-06 | 7:52 PM | 1/6/2014 | 8:45 PM | Delaware | RFC | Voltage Reduction due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-07 | 10:59 AM | 1/9/2014 | 9:00 AM | Illinois | RFC | Fuel Supply Emergency - Natural Gas | N/A | N/A | Fuel Supply Deficiency | ||
| 2014-01-07 | 9:30 AM | 1/8/2014 | 9:30 AM | Piedmont North Carolina, Piedmont South Carolina | SERC | Fuel Supply Emergency due to Severe Weather - Cold | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-01-07 | 6:00 PM | 1/7/2014 | 11:00 PM | South Carolina | SERC | Voltage Reduction; Public Appeal; Load Shed 100+MW due to Severe Weather - Cold | 4,853 | 677,858 | Weather | ||
| 2014-01-07 | 6:00 AM | 1/7/2014 | 8:30 AM | Northeast Tennessee | SERC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-07 | 6:00 AM | 1/7/2014 | 8:30 AM | Tennessee | SERC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-07 | 6:18 AM | 1/7/2014 | 6:19 AM | Pennsylvania | RFC | Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-07 | 7:58 AM | 1/7/2014 | 11:00 AM | North Carolina | SERC | Voltage Reduction; Public Appeal due to Severe Weather - Cold | 14,435 | Unknown | Weather | ||
| 2014-01-07 | 4:15 PM | 1/8/2014 | 1:20 PM | North Carolina | SERC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-07 | 9:00 PM | 1/8/2014 | 9:00 AM | Unknown | RFC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-08 | 6:00 AM | 1/8/2014 | 9:00 AM | South Carolina | SERC | Voltage Reduction; Public Appeal; Load Shed 100+MW due to Severe Weather - Cold | 4,545 | 677,858 | Weather | ||
| 2014-01-08 | 5:00 AM | 1/8/2014 | 6:30 AM | Unknown | RFC | Voltage Reduction due to Severe Weather - Cold | 576 | Unknown | Weather | ||
| 2014-01-13 | 4:44 PM | 1/13/2014 | 4:45 PM | Arizona | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-01-15 | 2:32 PM | 1/15/2014 | 2:45 PM | Utah | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-16 | 12:30 PM | 1/16/2014 | 1:57 PM | Arizona | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-01-17 | 10:30 AM | 1/28/2014 | 9:00 AM | Illinois | RFC | Fuel Supply Emergency - Natural Gas | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-01-17 | 12:20 PM | 1/17/2014 | 12:20 PM | Ohio | RFC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-01-18 | 5:39 PM | Unknown | Unknown | Unknown | RFC | Electrical System Islanding | Unknown | Unknown | Islanding | ||
| 2014-01-18 | 9:00 AM | 1/18/2014 | 9:45 AM | Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2014-01-21 | 12:14 PM | 1/21/2014 | 12:39 PM | Missouri | SERC | Physical Attack - Vandalism | 10 | Unknown | Physical Attack | ||
| 2014-01-21 | 5:00 PM | Unknown | Unknown | New Jersey | RFC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-22 | 12:30 AM | 1/22/2014 | 2:45 AM | Wisconsin | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-22 | 9:45 AM | 1/22/2014 | 8:19 PM | Ohio | RFC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-22 | 1:55 PM | 1/22/2014 | 2:55 PM | Wisconsin | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-22 | 9:15 PM | 1/23/2014 | 3:08 AM | Burlington County, New Jersey | RFC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-01-23 | 9:17 PM | 1/24/2014 | 5:00 PM | Wynoochee, Washington | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-23 | 4:00 AM | 1/24/2014 | 12:00 PM | Tennessee | SERC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-23 | 1:04 PM | 1/24/2014 | 9:00 AM | Maryland | RFC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-23 | 4:00 PM | 1/24/2014 | 12:00 PM | Tennessee | SERC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-24 | 12:00 AM | 4/9/2014 | 11:53 AM | Wisconsin | RFC | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-01-24 | 3:30 PM | 1/24/2014 | 5:00 PM | Wisconsin | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-25 | 10:00 AM | 1/25/2014 | 11:00 AM | Madison, Wisconsin | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-26 | 9:00 PM | 1/27/2014 | 11:00 AM | Oregon | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-01-26 | 11:00 PM | Unknown | Unknown | New Jersey | RFC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-01-27 | 2:20 PM | 1/28/2014 | 9:00 PM | Maryland | RFC | Public Appeal due to Severe Weather - Cold | Unknown | Unknown | Weather | ||
| 2014-01-29 | 4:00 PM | 1/29/2014 | 4:44 PM | Unknown | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-01-30 | 3:00 PM | Unknown | Unknown | Arizona | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-02-05 | 7:00 AM | 2/23/2014 | 7:00 AM | New York | NPCC | Fuel Supply Emergency - Coal | 300 | Unknown | Fuel Supply Deficiency | ||
| 2014-02-05 | 7:35 AM | 2/7/2014 | 4:03 AM | Lancaster Region, Pennsylvania | RFC | Severe Weather - Snow/Ice | Unknown | 62,159 | Weather | ||
| 2014-02-05 | 12:00 AM | 2/9/2014 | 6:00 PM | Maryland, West Virginia | RFC | Severe Weather - Snow/Ice | Unknown | 101,580 | Weather | ||
| 2014-02-05 | 1:00 AM | 2/9/2014 | 8:40 PM | Pennsylvania | RFC | Severe Weather - Snow/Ice | Unknown | 144,000 | Weather | ||
| 2014-02-05 | 8:05 AM | 2/5/2014 | 8:06 AM | Baltimore, Maryland | RFC | Severe Weather - Ice | 800 | 181,000 | Weather | ||
| 2014-02-05 | 5:00 AM | 2/5/2014 | 5:01 AM | Pennsylvania | RFC | Severe Weather - Snow/Ice | Unknown | 715,000 | Weather | ||
| 2014-02-06 | 1:00 PM | 2/6/2014 | 10:00 PM | California | WECC | Fuel Supply Emergency - Natural Gas | 4,000 | Unknown | Fuel Supply Deficiency | ||
| 2014-02-06 | 1:05 PM | 2/6/2014 | 7:15 PM | Northern California | WECC | Fuel Supply Emergency - Natural Gas | 160 | Unknown | Fuel Supply Deficiency | ||
| 2014-02-06 | 2:15 PM | 2/6/2014 | 7:39 PM | California | WECC | Fuel Supply Emergency - Natural Gas | 611 | Unknown | Fuel Supply Deficiency | ||
| 2014-02-06 | 1:58 PM | 2/6/2014 | 8:40 PM | Rio Grande Valley Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2014-02-06 | 3:35 PM | 2/7/2014 | 11:30 AM | ERCOT Region Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2014-02-07 | 7:00 AM | 3/21/2014 | 8:00 AM | Niagara County New York | NPCC | Fuel Supply Emergency - Coal | 675 | Unknown | Fuel Supply Deficiency | ||
| 2014-02-07 | 4:30 PM | 2/8/2014 | 9:00 AM | ERCOT Region Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2014-02-07 | 4:50 PM | 2/7/2014 | 8:30 PM | Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | Unknown | Public Appeal | ||
| 2014-02-12 | 2:15 PM | 2/12/2014 | 2:16 PM | Vermont | NPCC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-02-12 | 11:03 AM | 2/15/2014 | 8:40 AM | South Carolina | SERC | Severe Weather - Snow/Ice | 700 | 120,124 | Weather | ||
| 2014-02-12 | 12:10 PM | 2/15/2014 | 3:20 PM | North Carolina | SERC | Severe Weather - Snow/Ice | Unknown | 200,000 | Weather | ||
| 2014-02-12 | 7:48 AM | 2/15/2014 | 4:30 AM | Northern/Northeastern Georgia | SERC | Severe Weather - Snow/Ice | 1,246 | 373,835 | Weather | ||
| 2014-02-14 | 1:00 PM | 2/14/2014 | 3:00 PM | Portland, Oregon | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-02-18 | 6:43 PM | 2/18/2014 | 6:44 PM | Bend, Oregon | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-02-20 | 4:40 PM | 2/21/2014 | 11:59 PM | Missouri, Illinois | SERC | Severe Weather - Snow/Ice | Unknown | 66,000 | Weather | ||
| 2014-02-21 | 2:53 AM | 2/21/2014 | 9:00 PM | Northern/Northeastern Georgia | SERC | Severe Weather - Thunderstorms/High Winds | 221 | 66,445 | Weather | ||
| 2014-03-02 | 7:00 PM | 3/4/2014 | 9:00 AM | ERCOT Region Texas | TRE | Public Appeal due to Severe Weather - Cold | N/A | N/A | Islanding | ||
| 2014-03-03 | 1:48 AM | 3/3/2014 | 1:49 AM | Mid-Columbia River Generation, Washington | WECC | Fuel Supply Emergency - Hydro | 630 | Unknown | Fuel Supply Deficiency | ||
| 2014-03-03 | 5:25 PM | 3/3/2014 | 5:25 PM | New York | NPCC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-03-03 | 6:40 AM | 3/3/2014 | 3:28 PM | Tennessee | SERC | Severe Weather - Winter Storm | Unknown | 65,904 | Weather | ||
| 2014-03-04 | 9:06 AM | 3/17/2014 | 9:06 AM | Weston, Wisconsin | MRO | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-03-05 | 5:06 PM | 3/5/2014 | 5:07 PM | Salt Lake City, Utah | WECC | Physical Attack | Unknown | Unknown | physical Attack | ||
| 2014-03-07 | 3:30 AM | 3/7/2014 | 9:00 PM | Triad, North Carolina | SERC | Severe Weather - Winter Storm | 1500 | 370,900 | Weather | ||
| 2014-03-11 | 12:00 AM | 3/13/2014 | 12:00 AM | Boone County, Iowa | MRO | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-03-12 | 7:35 PM | 3/13/2014 | 12:00 PM | North Carolina | SERC | Severe Weather - High Winds | 250 | 61,377 | Weather | ||
| 2014-03-14 | 12:34 PM | 3/14/2014 | 4:45 PM | Boone County, Iowa | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-03-17 | 5:25 PM | 3/18/2014 | 12:56 AM | Glendale, Arizona | WECC | Physical Attack - Sabatoge | N/A | N/A | Physical Attack | ||
| 2014-03-20 | 12:00 AM | 3/20/2014 | 12:01 AM | New York | NPCC | Suspected Cyber Attack | Unknown | Unknown | Cyber Attack | ||
| 2014-03-24 | 11:07 AM | 3/24/2014 | 11:08 AM | Salt Lake City, Utah | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-03-26 | 1:37 PM | 3/26/2014 | 2:33 PM | Montana | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-03-26 | 4:00 PM | 4/10/2014 | 12:00 PM | Iowa | MRO | Physical Attack | N/A | N/A | Physical Attack | ||
| 2014-03-31 | 3:41 PM | 3/31/2014 | 8:08 PM | Puerto Rico | N/A | System Wide Voltage Reduction | Unknown | Unknown | ? | ||
| 2014-04-03 | 12:00 AM | Unknown | Unknown | Texas | TRE | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-04-03 | 2:45 PM | 4/9/2014 | 11:53 AM | Wisconsin | MRO | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-04-04 | 3:30 AM | 4/4/2014 | 8:15 AM | Central Arkansas | SERC | Severe Weather - Wind | Unknown | 57,200 | Weather | ||
| 2014-04-08 | 11:09 AM | 4/8/2014 | 11:20 AM | Puerto Rico | N/A | Voltage Reduction | Unknown | Unknown | ? | ||
| 2014-04-08 | 1:00 PM | 4/8/2014 | 1:01 PM | Davis, California | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-04-12 | 6:15 PM | 4/14/2014 | 9:00 AM | Western and Central Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 50,000 | Weather | ||
| 2014-04-12 | 8:00 PM | 4/15/2014 | 7:30 PM | Michigan | RFC | Severe Weather | Unknown | 164,000 | Weather | ||
| 2014-04-23 | 7:45 PM | 4/23/2014 | 8:37 PM | Baton Rouge, Louisiana | SERC | Load shedding of 100 Megawatts | 163 | 28,000 | Load Shed | ||
| 2014-04-24 | 3:02 PM | 4/24/2014 | 5:13 PM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-04-25 | 7:00 AM | 4/25/2014 | 7:30 AM | Delaware | RFC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-04-27 | 9:15 AM | Unknown | Unknown | Alberta, Canada | WECC | Electrical System Separation (Islanding) | 9750 | 4,000,000 | Islanding | ||
| 2014-04-27 | 12:07 PM | 4/27/2014 | 12:09 PM | Albany, Oregon | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-04-29 | 9:37 AM | 5/1/2014 | 9:00 AM | Northeastern Mississippi, Northern Alabama | SERC | Severe Weather - Thunderstorms | Unknown | 57,000 | Weather | ||
| 2014-04-29 | 11:30 PM | 4/29/2014 | 12:30 PM | Mississippi, Alabama | SERC | Severe Weather - Thunderstorms | 355 | 106,648 | Weather | ||
| 2014-04-30 | 3:50 AM | 4/30/2014 | 2:00 PM | Alabama, Florida, Georgia | SERC | Severe Weather - Thunderstorms | 296 | 89,000 | Weather | ||
| 2014-05-08 | 1:00 AM | 5/8/2014 | 1:01 AM | Mississippi | SERC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-05-08 | 8:39 AM | 5/8/2014 | 8:40 AM | Imperial Valley, California | WECC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-05-09 | 6:00 PM | 5/11/2014 | 1:00 PM | Indiana | RFC | Severe Weather - Heavy Winds | Unknown | 56,000 | Weather | ||
| 2014-05-11 | 6:38 PM | 5/11/2014 | 6:39 PM | MISO North, Minnesota | MRO | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-05-12 | 1:14 PM | 5/12/2014 | 1:15 PM | Layton, Utah | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-05-14 | 3:34 PM | Unknown | Unknown | San Diego & Orange Counties, California | WECC | Public Appeal to Reduce Electricity Usage - Wild Fires | N/A | 426 | Wildfire | ||
| 2014-05-15 | 12:10 PM | 5/15/2014 | 12:13 PM | Whiting, Indiana | RFC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2014-05-15 | 10:43 AM | Unknown | Unknown | San Diego & Orange Counties, California | WECC | Public Appeal to Reduce Electricity Usage - Wild Fires | 3,300 | 1,400,000 | Wildfire | ||
| 2014-05-16 | 10:43 AM | 5/16/2014 | 9:00 PM | San Diego & Orange Counties, California | WECC | Public Appeal to Reduce Electricity Usage - Wild Fires | 3,900 | 1,400,000 | Wildfire | ||
| 2014-05-20 | 7:01 AM | 5/20/2014 | 7:02 AM | Duchesne County, Utah | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-05-23 | 3:00 PM | 5/25/2014 | 7:00 PM | North Carolina | SERC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-05-26 | 12:31 PM | 5/26/2014 | 1:18 PM | British Columbia & Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-05-27 | 11:00 AM | 5/27/2014 | 4:53 PM | Phoenix, Arizona | WECC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-06-03 | 3:32 PM | 6/3/2014 | 3:59 PM | Alberta, Canada | WECC | Electrical System Islanding | 338 | N/A | Islanding | ||
| 2014-06-03 | 1:38 AM | 6/3/2014 | 1:43 AM | Texas | ERCOT | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-06-05 | 3:00 AM | 6/7/2014 | 11:45 PM | Shelby County, Tennessee | SERC | Severe Weather - Thunderstorms | 494 | 38,500 | Weather | ||
| 2014-06-05 | 1:06 PM | 6/5/2014 | 1:07 PM | West Tennessee | SERC | Severe Weather - Thunderstorms | Unknown | 56,475 | Weather | ||
| 2014-06-06 | 1:00 PM | Unknown | Unknown | Texas | ERCOT | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-06-07 | 11:00 PM | 6/8/2014 | 5:30 AM | North and Central , Alabama | SERC | Severe Weather - Thunderstorms | 217 | 65,000 | Weather | ||
| 2014-06-09 | 11:07 AM | 6/9/2014 | 11:30 AM | Alberta, Canada | WECC | Electrical System Islanding | Unknown | Unknown | Islanding | ||
| 2014-06-10 | 9:50 PM | 6/11/2014 | 2:30 PM | West Virginia | RFC | Severe Weather - Thunderstorms | Unknown | 66,383 | Weather | ||
| 2014-06-11 | 9:30 AM | 6/11/2014 | 9:31 AM | Nogales, Arizona | WECC | Suspected Physical Attack | N/A | N/A | Physical Attack | ||
| 2014-06-11 | 4:00 PM | 6/11/2014 | 4:30 PM | Southern Mississippi | SERC | Physical Attack - Vandalism | N/A | N/A | Physical Attack | ||
| 2014-06-12 | 9:10 AM | 6/12/2014 | 9:11 AM | Somervell County, Texas | ERCOT | Suspected Physical Attack | Unknown | Unknown | physical Attack | ||
| 2014-06-15 | 12:00 AM | 6/15/2014 | 1:00 AM | Central Minnesota | MRO | Severe Weather - Thunderstorms | Unknown | 55,951 | Weather | ||
| 2014-06-18 | 9:52 AM | 6/18/2014 | 7:00 PM | Washington | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-06-18 | 5:00 PM | 6/20/2014 | 3:00 PM | Southeast Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 138,802 | Weather | ||
| 2014-06-19 | 8:47 AM | 6/19/2014 | 8:48 AM | Nashville, Tennessee | SERC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-06-24 | 2:54 PM | 6/24/2014 | 2:55 PM | Nashville, Tennessee | SERC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-06-27 | 1:21 PM | Unknown | Unknown | Wisconsin | MRO | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-06-30 | 5:55 PM | 7/1/2014 | 2:53 AM | Southeast Wisconsin | MRO | Severe Weather - Thunderstorms | 424 | 120,000 | Weather | ||
| 2014-06-30 | 11:20 PM | 7/1/2014 | 5:00 PM | North Central Indiana | RFC | Severe Weather - Thunderstorms | Unknown | 127,000 | Weather | ||
| 2014-06-30 | 8:00 PM | 7/2/2014 | 6:30 PM | Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 420,000 | Weather | ||
| 2014-07-01 | 3:30 AM | Unknown | Unknown | Southwest Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 51,000 | Weather | ||
| 2014-07-01 | 5:00 AM | 7/2/2014 | 2:00 AM | Indiana, Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 57,237 | Weather | ||
| 2014-07-01 | 4:00 AM | 7/3/2014 | 11:30 PM | Southeast Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 140,000 | Weather | ||
| 2014-07-02 | 8:39 AM | 7/28/2014 | 3:13 PM | Wisconsin | MRO | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-07-03 | 10:55 PM | 7/4/2014 | 1:50 AM | Vermont, New Hampshire, Maine, Rhode Island, Massachusetts, Connecticut | NPCC | Severe Weather - Thunderstorms | Unknown | 64,000 | Weather | ||
| 2014-07-03 | 6:00 PM | 7/6/2014 | 12:00 PM | Pennsylvania | RFC | Severe Weather - Thunderstorms | Unknown | 298,165 | Weather | ||
| 2014-07-08 | 9:31 PM | Unknown | Unknown | Maryland | RFC | Severe Weather - Thunderstorms | Unknown | 56,600 | Weather | ||
| 2014-07-08 | 7:21 PM | 7/11/2014 | 7:00 AM | Upstate New York | NPCC | Severe Weather - Thunderstorms | Unknown | 65,000 | Weather | ||
| 2014-07-08 | 5:30 PM | 7/10/2014 | 3:00 PM | Central and Northeastern Pennsylvania | RFC | Severe Weather - Thunderstorms | Unknown | 66,000 | Weather | ||
| 2014-07-08 | 6:00 PM | 7/11/2014 | 5:53 PM | Eastern Pennsylvania | RFC | Severe Weather - Thunderstorms | Unknown | 69,000 | Weather | ||
| 2014-07-08 | 5:30 PM | 7/12/2014 | 11:30 PM | West Virginia | RFC | Severe Weather - Thunderstorms | Unknown | 71,000 | Weather | ||
| 2014-07-08 | 5:30 PM | 7/12/2014 | 11:20 PM | Maryland, West Virginia | RFC | Severe Weather - Thunderstorms | Unknown | 96,000 | Weather | ||
| 2014-07-08 | 8:30 PM | 7/11/2014 | 11:00 PM | Pennsylvania | RFC | Severe Weather - Thunderstorms | Unknown | 260,000 | Weather | ||
| 2014-07-14 | 4:00 PM | 7/14/2014 | 4:15 PM | Washington | WECC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-07-23 | 7:14 PM | 7/24/2014 | 12:23 AM | Arkansas, Louisiana | SERC | Severe Weather - Thunderstorms | Unknown | 57,299 | Weather | ||
| 2014-07-24 | 4:29 PM | 7/24/2014 | 11:32 PM | California | WECC | Load shedding of 100 Megawatts | 126 | 26,856 | Load Shed | ||
| 2014-07-27 | 11:00 PM | 7/28/2014 | 4:00 AM | Central California | WECC | Uncontrolled Loss of 300 Megawatts | 480 | 1 | ? | ||
| 2014-07-27 | 5:00 PM | 7/28/2014 | 11:00 PM | Southeast Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 156,611 | Weather | ||
| 2014-08-01 | 3:03 PM | 8/1/2014 | 3:04 PM | Utah | WECC | Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-08-13 | 6:08 AM | 8/13/2014 | 6:34 AM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | 370 | Unknown | Islanding | ||
| 2014-08-20 | 1:21 AM | 8/20/2014 | 1:41 AM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-08-23 | 4:39 PM | 8/24/2014 | 1:46 AM | City of Highland, Illinois | RFC | Operational Failure of Electrical System | 31 | 6,549 | Operations | ||
| 2014-08-24 | 3:20 AM | 8/25/2014 | 7:05 AM | North of San Francisco, California | WECC | Earthquake | 95 | 70,000 | Natural Disaster | ||
| 2014-08-26 | 3:30 PM | Unknown | Unknown | Southeast Michigan | RFC | Severe Weather - Thunderstorms | Unknown | Unknown | Weather | ||
| 2014-08-27 | 12:49 PM | 8/27/2014 | 1:30 PM | Delaware | RFC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-08-30 | 3:30 PM | 9/1/2014 | 2:30 PM | Luzerne County, Pennsylvania | RFC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-09-05 | 7:14 PM | 9/6/2014 | 1:00 PM | Lower Peninsula of Michigan | RFC | Severe Weather - Thunderstorms | 50 | 60,000 | Weather | ||
| 2014-09-05 | 4:30 PM | 9/6/2014 | 2:00 PM | Illinois | RFC | Severe Weather - Thunderstorms | Unknown | 180,400 | Weather | ||
| 2014-09-05 | 8:00 PM | Unknown | Unknown | Michigan | RFC | Severe Weather - Thunderstorms | Unknown | 324,000 | Weather | ||
| 2014-09-09 | 8:18 AM | 9/9/2014 | 11:59 PM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-09-11 | 4:56 AM | 9/11/2014 | 5:37 AM | Alberta, Canada | WECC | Electrical System Separation (Islanding) | Unknown | Unknown | Islanding | ||
| 2014-09-14 | 9:50 PM | 9/17/2014 | 3:08 PM | Oregon | WECC | Electrical System Separation (Islanding) | 1 | 123 | Islanding | ||
| 2014-09-16 | 11:56 AM | 9/16/2014 | 11:57 AM | California | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-09-17 | 1:30 PM | 9/17/2014 | 2:00 PM | Michigan | RFC | Suspected Physical Attack - Suspcious Activity | Unknown | Unknown | Physical Attack | ||
| 2014-09-19 | 2:20 PM | 9/23/2014 | 1:10 PM | Estacada, Oregon | WECC | Electrical System Separation (Islanding) | 1 | 123 | Islanding | ||
| 2014-09-21 | 1:30 PM | Unknown | Unknown | New York | NPCC | Physical Attack - Suspcious Activity | Unknown | Unknown | Physical Attack | ||
| 2014-09-22 | 11:00 AM | 9/22/2014 | 11:01 AM | Northeast Minnesota | MRO | Fuel Supply Emergency - Coal | 1,000 | 140,000 | Fuel Supply Deficiency | ||
| 2014-09-23 | 1:13 AM | 9/23/2014 | 3:00 AM | New York | NPCC | Physical Attack - Suspcious Activity | N/A | N/A | Physical Attack | ||
| 2014-09-24 | 11:30 AM | 9/24/2014 | 3:43 PM | Washington | WECC | Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-02 | 3:00 PM | 10/2/2014 | 3:01 PM | Cave Junction, Oregon | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-02 | 10:15 PM | Unknown | Unknown | Arkansas | SERC | Severe Weather - Thunderstorms | Unknown | 67,300 | Weather | ||
| 2014-10-02 | 4:00 PM | 10/7/2014 | 10:00 AM | Texas | TRE | Severe Weather - Thunderstorms | Unknown | 500,000 | Weather | ||
| 2014-10-06 | 10:52 AM | 10/7/2014 | 12:52 AM | Houston, Texas | TRE | Severe Weather - Thunderstorms | 292 | 129,237 | Weather | ||
| 2014-10-07 | 12:00 PM | 10/7/2014 | 12:01 PM | Maryland | RFC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-08 | 4:49 PM | 10/8/2014 | 6:23 PM | Rio Grande Valley Texas | TRE | Public Appeal to Reduce Electricity Usage; Load Shed of 100 MW | 585 | 120,000 | Public Appeal | ||
| 2014-10-08 | 4:47 PM | 10/8/2014 | 6:29 PM | Rio Grande Valley Texas | TRE | Public Appeal to Reduce Electricity Usage; Load Shed of 100 MW | Unknown | Unknown | Public Appeal | ||
| 2014-10-09 | 9:27 AM | Unknown | Unknown | Rio Grande Valley Texas | TRE | Public Appeal to Reduce Electricity Usage | Unknown | 2,800 | Public Appeal | ||
| 2014-10-13 | 12:45 PM | 10/13/2014 | 4:15 PM | Louisiana | SERC | Severe Weather - Thunderstorms | Unknown | 68,600 | Weather | ||
| 2014-10-14 | 6:20 PM | 10/14/2014 | 6:28 PM | Puerto Rico | N/A | Voltage Reduction | Unknown | Unknown | ? | ||
| 2014-10-14 | 7:33 AM | 10/14/2014 | 7:34 AM | Oregon | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-14 | 5:44 AM | 10/14/2014 | 5:50 PM | Alabama, Florida, Georgia | SERC | Severe Weather - Thunderstorms | 191 | 57,475 | Weather | ||
| 2014-10-15 | 7:46 AM | 10/15/2014 | 7:47 AM | Oregon | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-16 | 9:12 AM | 10/17/2014 | 3:00 PM | Garden City, Kansas | MRO | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-16 | 1:25 PM | 10/16/2014 | 5:26 PM | Manitoba | MRO | Suspected Physical Attack | 129 | Unknown | Physical Attack | ||
| 2014-10-20 | 12:00 AM | Unknown | Unknown | Howard County, Texas | MRO | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-21 | 8:25 AM | 10/21/2014 | 10:08 AM | Carmel, Indiana | MRO | Suspected Cyber Attack | Unknown | Unknown | Cyber Attack | ||
| 2014-10-22 | 10:46 PM | 10/22/2014 | 10:47 PM | New Hampshire, Maine, Massachusetts, Rhode Island, Connecticut, Vermont | NPCC | Severe Weather | Unknown | 66,650 | Weather | ||
| 2014-10-24 | 4:00 PM | 10/24/2014 | 5:50 PM | Howard County, Texas | MRO | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-24 | 6:16 PM | 10/25/2014 | 1:51 PM | Enfield, Connecticut | NPCC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-10-25 | 4:00 PM | 10/25/2014 | 10:00 PM | Greater Portland and Salem, Oregon | WECC | Severe Weather - Wind | 216 | 78,000 | Weather | ||
| 2014-10-25 | 6:00 PM | Unknown | Unknown | King County, Thurston County and Kitsap County, Washington | WECC | Severe Weather - Wind | 154 | 96,000 | Weather | ||
| 2014-11-01 | 1:00 AM | 11/1/2014 | 1:01 AM | Portland, Oregon | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-02 | 1:46 PM | Unknown | Unknown | Massachusetts, Maine, Vermont, New Hampshire, Rhode Island, Connecticut | NPCC | Severe Weather - Winter Storm | Unknown | 63,719 | Weather | ||
| 2014-11-11 | 6:00 PM | 11/14/2014 | 3:00 PM | Washington | WECC | Severe Weather - Wind | 132 | 68,000 | Weather | ||
| 2014-11-12 | 2:59 AM | 11/12/2014 | 3:00 AM | Unknown | SERC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-13 | 7:07 AM | 11/13/2014 | 7:08 AM | Howard County,Texas | MRO | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-14 | 9:50 AM | 11/14/2014 | 1:18 PM | Estacada, Oregon | WECC | Electrical System Islanding | 1 | 123 | Islanding | ||
| 2014-11-19 | 2:44 PM | 11/19/2014 | 2:45 PM | Victorville, California | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-21 | 11:26 AM | 11/23/2014 | 5:20 PM | Sand Springs - Fort Rock, Oregon | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-21 | 8:29 PM | 11/23/2014 | 12:16 AM | Twin Falls, Idaho | WECC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-11-24 | 12:00 AM | Unknown | Unknown | Nebraska, Kansas, Texas, Arkansas, Louisiana, New Mexico | SPP | Fuel Supply Emergency - Coal | Unknown | Unknown | Fuel Supply Deficiency | ||
| 2014-11-24 | 12:00 PM | 11/27/2014 | 1:00 PM | Michigan | RFC | Severe Weather - Wind | Unknown | 186,154 | Weather | ||
| 2014-11-26 | 5:50 PM | 11/28/2014 | 7:00 AM | New Hampshire, Massachusetts, Maine, Rhode Island, Connecticut, Vermont | NPCC | Severe Weather - Winter Storm | Unknown | 79,530 | Weather | ||
| 2014-12-01 | 10:44 AM | 12/1/2014 | 10:45 AM | Fayetteville, North Carolina | SERC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-12-03 | 12:15 PM | 12/3/2014 | 12:16 PM | Maine | NPCC | Suspected Physical Attack - Vandalism | Unknown | Unknown | Physical Attack | ||
| 2014-12-11 | 7:21 AM | 12/11/2014 | 9:53 PM | San Francisco, California | WECC | Distribution Interruption - Unknown Cause | 225 | 75,000 | Distribution Interruption | ||
| 2014-12-11 | 4:05 PM | 12/11/2014 | 9:00 PM | Portland, Oregon | WECC | Severe Weather- High Winds | 250 | 85,470 | Weather | ||
| 2014-12-11 | 5:00 PM | 12/12/2014 | 10:00 AM | Kitsap, Thurston, Whatcom counties Washington | WECC | Severe Weather- High Winds | 116 | 264,000 | Weather | ||
| 2014-12-11 | 6:40 AM | Unknown | Unknown | Northern California | WECC | Severe Weather- High Winds | Unknown | Unknown | Weather | ||
| 2014-12-11 | 11:15 PM | Unknown | Unknown | Northern California | WECC | Severe Weather- High Winds | Unknown | Unknown | Weather | ||
| 2014-12-17 | 11:00 AM | 12/17/2014 | 12:15 PM | Washington | WECC | Suspected Physical Attack | Unknown | Unknown | Physical Attack | ||
| 2014-12-30 | 3:50 PM | 12/31/2014 | 11:00 AM | New Hampshire, Massachusetts, Maine, Rhode Island, Connecticut, Vermont | NPCC | Suspected Cyber Attack | Unknown | Unknown | Cyber Attack | ||
| 2014-12-30 | 1:08 PM | 1/1/2015 | 4:50 PM | Northern California | WECC | Severe Weather- High Winds | 127 | 84,500 | Weather | ||
| January | 2015-01-07 | 5:00 PM | 1/8/2015 | 8:35 AM | Tennessee | SERC | Public appeal to reduce the use of electricity | Severe Weather - Winter | Unknown | Unknown | Weather |
| January | 2015-01-07 | 5:00 PM | 1/8/2015 | 8:35 AM | Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri | SERC | Public appeal to reduce the use of electricity | Severe Weather - Winter | Unknown | Unknown | Weather |
| January | 2015-01-22 | 4:24 AM | 1/22/2015 | 5:55 AM | Portland, Oregon | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| January | 2015-01-26 | 2:39 PM | 1/26/2015 | 2:40 PM | Cave Junction, Oregon | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| January | 2015-01-27 | 10:30 AM | 1/27/2015 | 10:31 AM | Kountze, Texas | SERC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| February | 2015-02-01 | 11:24 AM | 2/1/2015 | 11:44 AM | Weber County, Utah | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-02 | 9:40 AM | 2/2/2015 | 9:41 AM | Conroe, Texas | TRE | Suspected Physical Attack | Sabotage | Unknown | Unknown | Physical Attack |
| February | 2015-02-04 | 11:55 AM | 2/4/2015 | 11:56 AM | Vollmers, California | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-05 | 8:15 AM | 2/5/2015 | 8:17 AM | Cameron, Arizona | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-05 | 11:20 AM | 2/5/2015 | 11:21 AM | Dunismuir, California | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-06 | 8:58 PM | Unknown | Unknown | Northern California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Wind | Unknown | 65,000 | Weather |
| February | 2015-02-09 | 11:30 AM | 2/9/2015 | 1:15 PM | Colorado Springs, Colorado | WECC | Suspected Physical Attack | Sabotage | Unknown | Unknown | Physical Attack |
| February | 2015-02-16 | 9:00 PM | 2/18/2015 | 2:00 PM | Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | Unknown | 67,189 | Weather |
| February | 2015-02-16 | 9:41 PM | 2/18/2015 | 7:00 AM | Northern/North Eastern, Georgia | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | 620 | 186,035 | Weather |
| February | 2015-02-17 | 6:20 AM | 2/17/2015 | 7:30 AM | Prescott Valley, Arizona | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-17 | 9:00 AM | 2/18/2015 | 11:00 PM | North Carolina, South Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | Unknown | 52,000 | Weather |
| February | 2015-02-17 | 2:12 AM | 2/18/2015 | 4:00 PM | North Carolina, South Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | Unknown | 68,000 | Weather |
| February | 2015-02-18 | 3:00 PM | 2/20/2015 | 9:00 AM | Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri | SERC | Public appeal to reduce the use of electricity | Severe Weather - Winter | Unknown | Unknown | Weather |
| February | 2015-02-19 | 2:30 PM | 2/19/2015 | 3:20 PM | Winslow, Arizona | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2015-02-20 | 6:00 AM | 2/20/2015 | 10:00 AM | North Carolina, South Carolina | SERC | System-wide voltage reductions of 3 percent or more | Severe Weather - Winter | Unknown | Unknown | Weather |
| February | 2015-02-21 | 8:34 AM | 2/21/2015 | 12:45 PM | Fentress County, Tennessee | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | Unknown | 50,000 | Weather |
| February | 2015-02-26 | 3:30 AM | 2/27/2015 | 12:00 PM | North Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | 400 | 103,776 | Weather |
| February | 2015-02-26 | 3:12 AM | 2/26/2015 | 8:00 PM | North Carolina, South Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Winter | Unknown | 124,000 | Weather |
| March | 2015-03-04 | 9:05 AM | 3/4/2015 | 2:15 PM | Johnson City , Tennessee | SERC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| March | 2015-03-09 | 11:50 PM | 3/10/2015 | 10:53 AM | Washington | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| March | 2015-03-15 | 3:30 PM | 3/15/2015 | 7:00 PM | Greater Portland & Salem , Oregon | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Wind | 210 | 71,000 | Weather |
| March | 2015-03-16 | 7:31 AM | 3/16/2015 | 10:06 AM | Winona , Minnesota | MRO | Suspected Physical Attack | Sabotage | 20 | 5,941 | Physical Attack |
| March | 2015-03-19 | 6:30 PM | 3/19/2015 | 9:37 PM | Southwest Kansas | SPP | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| March | 2015-03-22 | 4:25 PM | 3/22/2015 | 4:26 PM | West Virginia | RFC | Suspected Physical Attack | Vandalism | 24 | 0 | Physical Attack |
| March | 2015-03-26 | 3:21 PM | 3/26/2015 | 4:59 PM | Contra Costa County, California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 15 | Unknown | Islanding |
| March | 2015-03-29 | 4:26 AM | 3/29/2015 | 9:21 AM | California | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| April | 2015-04-01 | 6:25 PM | 4/1/2015 | 6:26 PM | San Juan County, Utah | WECC | Suspected Physical Attack | Vandalism | Unknown | 37 | Physical Attack |
| April | 2015-04-02 | 7:04 AM | 4/2/2015 | 8:57 AM | San Juan County, Utah | WECC | Suspected Physical Attack | Vandalism | 6 | 5,763 | Physical Attack |
| April | 2015-04-03 | 2:00 AM | 4/3/2015 | 7:48 AM | Harvey, Reno, and Sedgwick Counties, Kansas | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather - Thunderstorms | Unknown | 70,000 | Weather |
| April | 2015-04-06 | 8:12 AM | 4/6/2015 | 12:08 PM | Butte County, California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | Unknown | 80,000 | Operations |
| April | 2015-04-07 | 3:34 PM | 4/7/2015 | 3:46 PM | California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 0 | 0 | Islanding |
| April | 2015-04-07 | 12:30 PM | 4/7/2015 | 5:34 PM | Unknown | RFC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | Unknown | Unknown | Operations |
| April | 2015-04-17 | 9:16 AM | 4/17/2015 | 11:00 AM | Canada | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 9,300 | Unknown | Islanding |
| April | 2015-04-17 | 9:30 PM | 4/19/2015 | 11:50 PM | Houston, Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 280,982 | Weather |
| April | 2015-04-18 | 9:00 PM | 4/21/2015 | 4:00 AM | Dallas, Fort Worth, Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 89,000 | Weather |
| April | 2015-04-24 | 7:10 PM | 4/26/2015 | 4:00 PM | Dallas, Fort Worth, Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,000 | Weather |
| April | 2015-04-27 | 10:30 AM | 4/28/2015 | 6:45 PM | Louisiana and Texas | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 199,000 | Weather |
| May | 2015-05-02 | 10:51 PM | 5/3/2015 | 12:26 AM | Franklin County, Tennessee | SERC | Suspected Physical Attack | Vandalism | 1 | 215 | Physical Attack |
| May | 2015-05-04 | 3:25 PM | 5/4/2015 | 3:26 PM | Salt Lake County, Utah | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| May | 2015-05-11 | 8:32 AM | 5/11/2015 | 8:33 AM | Shasta County, California | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| May | 2015-05-12 | 12:40 AM | 5/12/2015 | 12:45 AM | Coahoma County, Mississippi | SERC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| May | 2015-05-18 | 3:28 PM | 5/18/2015 | 3:47 PM | Washington | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | Severe Weather | 275 | 0 | Weather |
| May | 2015-05-25 | 8:30 PM | Unknown | Unknown | Texas, Louisiana, Arkansas | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,351 | Weather |
| May | 2015-05-25 | 8:30 PM | 5/26/2015 | 6:30 PM | Texas | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,531 | Weather |
| May | 2015-05-25 | 10:45 PM | 5/28/2015 | 1:25 AM | Fort Bend County, & Harris County ,Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 61,000 | Weather |
| May | 2015-05-25 | 6:00 PM | 5/29/2015 | 7:15 AM | North Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 454,000 | Weather |
| May | 2015-05-26 | 5:30 AM | 5/27/2015 | 7:00 PM | Texas, Louisiana, Arkansas, Mississippi | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 78,515 | Weather |
| June | 2015-06-01 | 7:19 PM | 6/2/2015 | 8:36 AM | California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 5 | 484 | Islanding |
| June | 2015-06-01 | 12:27 AM | 6/1/2015 | 2:15 AM | Daviess County, Kentucky | SERC | Suspected Physical Attack | Vandalism | 2 | 110 | Physical Attack |
| June | 2015-06-02 | 6:58 PM | 6/2/2015 | 7:24 PM | California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 5 | 727 | Islanding |
| June | 2015-06-03 | 3:00 PM | 6/5/2015 | 5:00 PM | Texas | TRE | Public appeal to reduce the use of electricity | System Operations | Unknown | Unknown | Public Appeal |
| June | 2015-06-07 | 1:52 PM | 6/7/2015 | 2:13 PM | Tennessee | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | Unknown | Unknown | Operations |
| June | 2015-06-07 | 1:54 PM | 6/7/2015 | 2:13 PM | Shelby County, Tennessee | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident System-wide voltage reductions of 3 percent or more | System Operations | 926 | Unknown | Operations |
| June | 2015-06-08 | 12:00 AM | Unknown | Unknown | Merced County, California | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | System Operations | 176 | Unknown | Fuel Supply Deficiency |
| June | 2015-06-20 | 1:52 PM | 6/20/2015 | 3:30 PM | Solano County, California | WECC | Suspected Physical Attack | Vandalism | Unknown | 0 | Physical Attack |
| June | 2015-06-23 | 6:18 PM | 6/23/2015 | 8:30 PM | New Jersey | RFC | Load shedding of 100 Megawatts or more implemented under emergency operational policy Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | 198 | 156,338 | Load Shed |
| June | 2015-06-23 | 6:30 PM | 6/24/2015 | 5:00 AM | Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 62,442 | Weather |
| June | 2015-06-23 | 5:06 PM | 6/26/2015 | 4:00 PM | New Castle County, Delaware | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 65,000 | Weather |
| June | 2015-06-23 | 6:26 PM | Unknown | Unknown | New Jersey | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 90 | 73,000 | Weather |
| June | 2015-06-23 | 5:30 PM | 6/23/2015 | 7:00 PM | Delaware County, PA; Chester County, PA | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 200,000 | Weather |
| June | 2015-06-23 | 6:00 PM | 6/30/2015 | 6:00 PM | Gloucester County, Burlington County, Atlantic County, Cape May County, New Jersey | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 263,000 | Weather |
| June | 2015-06-26 | 2:00 AM | Unknown | Unknown | Kansas | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 110,000 | Weather |
| June | 2015-06-27 | 5:00 PM | 6/30/2015 | 5:18 PM | Wayne County, Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 68,000 | Weather |
| June | 2015-06-29 | 7:21 PM | 6/29/2015 | 7:42 PM | Washington | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | Severe Weather | 0 | 0 | Weather |
| June | 2015-06-30 | 10:50 AM | 7/1/2015 | 9:00 PM | California | WECC | Public appeal to reduce the use of electricity | Severe Weather | Unknown | Unknown | Weather |
| June | 2015-06-30 | 2:00 PM | 6/30/2015 | 9:00 PM | California | WECC | Public appeal to reduce the use of electricity | Severe Weather | Unknown | Unknown | Weather |
| July | 2015-07-03 | 5:17 PM | 7/3/2015 | 11:30 PM | Texas | TRE | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 350 | 30,000 | Operations |
| July | 2015-07-03 | 8:30 AM | 7/3/2015 | 2:30 PM | Butte County, California | WECC | Suspected Physical Attack | Suspicious Activity | 0 | 0 | physical Attack |
| July | 2015-07-13 | 7:40 PM | 7/15/2015 | 12:15 PM | Virginia | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 52,739 | Weather |
| July | 2015-07-13 | 2:14 PM | 7/16/2015 | 6:00 AM | Ohio, Kentucky | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 480 | 68,339 | Weather |
| July | 2015-07-14 | 8:00 PM | 7/15/2015 | 9:23 AM | Alabama | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 366 | 111,644 | Weather |
| July | 2015-07-14 | 3:29 PM | 7/15/2015 | 11:55 AM | Arkansas | SPP | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Severe Weather | Unknown | Unknown | Weather |
| July | 2015-07-15 | 2:00 AM | 7/15/2015 | 2:55 AM | California | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 360 | 0 | Operations |
| July | 2015-07-16 | 4:45 PM | 7/16/2015 | 5:48 PM | Texas | SPP | Load shedding of 100 Megawatts or more implemented under emergency operational policy | System Operations | 117 | 17,311 | Load Shed |
| July | 2015-07-18 | 6:26 PM | 7/18/2015 | 9:03 PM | California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 30 | 70 | Islanding |
| July | 2015-07-18 | 7:59 PM | 7/18/2015 | 10:45 PM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 160 | 78,164 | Weather |
| July | 2015-07-18 | 2:00 AM | 7/19/2015 | 7:00 AM | Henepin and Ramsey County, Minnesota | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 250 | 250,000 | Weather |
| July | 2015-07-21 | 12:47 PM | 7/21/2015 | 1:12 PM | Washington | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | System Operations | 200 | Unknown | Load Shed |
| July | 2015-07-27 | 3:52 AM | 7/27/2015 | 4:36 AM | California | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | Unknown | 484 | Islanding |
| July | 2015-07-28 | 12:05 PM | 7/28/2015 | 12:26 PM | Puerto Rico | N/A | System-wide voltage reductions of 3 percent or more | System Operations | 150 | Unknown | Operations |
| July | 2015-07-29 | 4:45 PM | 7/29/2015 | 9:00 PM | New York | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | System Operations | 500 | 0 | Fuel Supply Deficiency |
| July | 2015-07-30 | 1:00 PM | Unknown | Unknown | Tennessee | SERC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| July | 2015-07-30 | 9:50 AM | 7/30/2015 | 7:00 PM | Texas | TRE | Public appeal to reduce the use of electricity | System Operations | Unknown | Unknown | Public Appeal |
| July | 2015-07-31 | 10:55 AM | Unknown | Unknown | Washington | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | System Operations | 9 | 0 | Islanding |
| August | 2015-08-02 | 5:45 PM | 8/4/2015 | 3:00 AM | Michigan: Emmet County; Grand Traverse County; Leelanau County; Kalkaska County; Benzie County; Manistee County; Wexford County; Missaukee County; Mecosta County; | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 162,000 | Weather |
| August | 2015-08-03 | 8:27 AM | 8/4/2015 | 1:18 AM | Arizona: New Mexico | WECC | Suspected Physical Attack | Sabotage | 0 | Unknown | Physical Attack |
| August | 2015-08-03 | 1:00 AM | 8/5/2015 | 12:00 AM | Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 72,520 | Weather |
| August | 2015-08-03 | 12:30 AM | 8/3/2015 | 2:00 AM | Illinois | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 115,000 | Weather |
| August | 2015-08-04 | 7:17 AM | 8/5/2015 | 12:52 PM | Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 132,000 | Weather |
| August | 2015-08-11 | 7:30 PM | 8/13/2015 | 4:05 AM | Texas: Houston; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 100,000 | Weather |
| August | 2015-08-13 | 3:15 PM | 8/13/2015 | 7:00 PM | Texas: Williamson County; | TRE | Public appeal to reduce the use of electricity | Other | Unknown | Unknown | Public Appeal |
| August | 2015-08-27 | 9:51 PM | 8/28/2015 | 6:00 PM | Puerto Rico | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident / Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | 360 | Unknown | Operations |
| August | 2015-08-29 | 1:00 PM | 8/31/2015 | 7:00 AM | Washington: King County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1,200 | 64,000 | Weather |
| August | 2015-08-29 | 11:00 AM | 9/4/2015 | 3:00 PM | King County, Skagit County, Whatcom County, Kitsap County, Pierce County, Thurston County, Island County, Washington | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 250 | 250,000 | Weather |
| August | 2015-08-29 | 10:00 AM | Unknown | Unknown | Washington | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 500,000 | Weather |
| September | 2015-09-03 | 2:33 AM | 9/3/2015 | 6:25 AM | Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50,114 | Weather |
| September | 2015-09-13 | 5:56 PM | 9/13/2015 | 8:37 PM | New York: Dutchess County; | NPCC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| September | 2015-09-20 | 1:12 PM | 9/20/2015 | 1:44 PM | California | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | System Operations | 150 | Unknown | Load Shed |
| September | 2015-09-29 | 3:40 PM | 9/29/2015 | 3:41 PM | Oregon | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| October | 2015-10-13 | 6:30 AM | 10/13/2015 | 8:30 AM | Utah: Emery County; | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| October | 2015-10-13 | 10:25 AM | 10/13/2015 | 6:00 PM | Texas | TRE | Public appeal to reduce the use of electricity | Other | Unknown | Unknown | Public Appeal |
| October | 2015-10-13 | 4:32 PM | 10/13/2015 | 8:39 PM | California | WECC | Public appeal to reduce the use of electricity | Other | 41,788 | Unknown | Public Appeal |
| October | 2015-10-16 | 12:25 PM | 10/16/2015 | 12:56 PM | Utah | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| October | 2015-10-18 | 7:00 AM | 10/18/2015 | 11:29 PM | California: Central Coast area; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 88 | 55,677 | Weather |
| October | 2015-10-23 | 9:42 AM | 10/23/2015 | 1:26 PM | Puerto Rico | N/A | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational / Load shedding of 100 Megawatts or more implemented under emergency operational policy / System-wide voltage reductions of 3 percent of more / Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | 500 | 300,000 | Islanding |
| October | 2015-10-28 | 1:38 PM | 10/29/2015 | 5:00 PM | Pennsylvania: Columbia County; Montour County; Northumberland County; | RFC | Suspected Physical Attack | Other | Unknown | 35,000 | physical Attack |
| October | 2015-10-30 | 3:00 PM | 10/30/2015 | 4:00 PM | Oregon: Josephine County; | WECC | Suspected Physical Attack | Other | 0 | 0 | physical Attack |
| October | 2015-10-31 | 12:45 AM | 11/1/2015 | 4:05 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 130,252 | Weather |
| November | 2015-11-01 | 11:53 AM | 11/1/2015 | 12:00 PM | Ohio: Hamilton County; | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | physical Attack |
| November | 2015-11-02 | 5:37 PM | 11/4/2015 | 9:00 AM | Arkansas: Hot Spring County; | SERC | Suspected Physical Attack | Sabotage | 4 | 0 | physical Attack |
| November | 2015-11-10 | 12:00 PM | 11/10/2015 | 2:00 PM | Indiana: Dearborn County; | RFC | Suspected Physical Attack | Sabotage | 0 | 0 | physical Attack |
| November | 2015-11-13 | 11:30 AM | 11/13/2015 | 11:35 AM | New York | NPCC | Suspected Physical Attack | Suspicious Activity | Unknown | Unknown | physical Attack |
| November | 2015-11-17 | 9:00 AM | Unknown | Unknown | Washington: Snohomish County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 900 | 89,000 | Weather |
| November | 2015-11-17 | 1:30 PM | Unknown | Unknown | Washington: Stevens County, Lincoln County, Adams County, Whitman County, Spokane County; Idaho: Bonner County, Kootenai County, Shoshone County, Benewah County, Idaho County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 182,000 | Weather |
| November | 2015-11-17 | 10:00 AM | Unknown | Unknown | Washington | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 300,000 | Weather |
| November | 2015-11-21 | 8:30 PM | 11/23/2015 | 1:00 AM | Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 60,000 | Weather |
| November | 2015-11-28 | 6:00 AM | Unknown | Unknown | Oklahoma | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 35,000 | Weather |
| November | 2015-11-28 | 6:00 AM | 11/30/2015 | 1:00 PM | Oklahoma | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 55,609 | Weather |
| November | 2015-11-29 | 4:48 PM | 11/29/2015 | 6:20 PM | Puerto Rico | N/A | System-wide voltage reductions of 3 percent or more | System Operations | 0 | 0 | Operations |
| November | 2015-11-30 | 6:18 AM | 11/30/2015 | 9:18 PM | Puerto Rico | N/A | System-wide voltage reductions of 3 percent or more | System Operations | 100 | 86,559 | Operations |
| December | 2015-12-02 | 1:03 PM | 12/3/2015 | 12:29 PM | Kansas: Thomas County; | SPP | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| December | 2015-12-05 | 7:22 PM | 12/6/2015 | 5:27 AM | New York: Orange County, Sullivan County; Pennsylvania: Pike County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Other | 110 | 52,476 | Operations |
| December | 2015-12-05 | 9:00 PM | 12/5/2015 | 10:30 PM | Kansas | SPP | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| December | 2015-12-08 | 2:00 PM | 12/8/2015 | 2:01 PM | Nevada: Clark County; | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| December | 2015-12-09 | 6:06 PM | 12/9/2015 | 9:52 PM | Puerto Rico | System-wide voltage reductions of 3 percent or more | System Operations | 0 | 0 | Operations | |
| December | 2015-12-09 | 4:00 AM | 12/9/2015 | 11:00 AM | Washington | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 115 | 76,300 | Weather |
| December | 2015-12-10 | 3:53 AM | 12/10/2015 | 4:08 AM | California: Plumas County | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | Severe Weather | 24 | 9,956 | Islanding |
| December | 2015-12-10 | 9:25 PM | 12/10/2015 | 10:30 PM | Missouri: New Madrid County; | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 400 | 1 | Operations |
| December | 2015-12-10 | 5:55 PM | 12/10/2015 | 5:56 PM | California: Stanislaus County; | WECC | Suspected Physical Attack | Vandalism | Unknown | Unknown | Physical Attack |
| December | 2015-12-10 | 6:01 AM | 12/10/2015 | 7:13 AM | California: Northern; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational | Severe Weather | 29 | 9,956 | Weather |
| December | 2015-12-24 | 3:00 AM | 12/26/2015 | 12:00 AM | Michigan: Antrim County, Charlevoix County, Manistee County, Mecosta County, Kalkaska County, Grand Traverse County, Osceola County, Lake County, Newaygo County, Clare County, Isabella County; | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 168,000 | Weather |
| December | 2015-12-26 | 7:30 PM | Unknown | Unknown | Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 70,000 | Weather |
| December | 2015-12-26 | 6:00 PM | 12/30/2015 | 6:00 AM | Texas: Oklahoma: | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 116,800 | Weather |
| December | 2015-12-27 | 5:00 PM | Unknown | Unknown | Oklahoma | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50,500 | Weather |
| December | 2015-12-27 | 11:38 PM | 12/28/2015 | 5:00 PM | Oklahoma | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 54,476 | Weather |
| December | 2015-12-29 | 8:30 AM | 12/29/2015 | 8:31 AM | Maine | NPCC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| December | 2015-12-31 | 11:00 AM | Unknown | Unknown | Missouri | SERC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| December | 2015-12-31 | 5:00 PM | 12/31/2015 | 9:40 PM | Oklahoma: Blaine County; | SPP | Public appeal to reduce the use of electricity | Severe Weather | 8 | 1,500 | Weather |
| January | 2016-01-04 | 5:15 AM | 1/5/2016 | 8:00 AM | Wisconsin: Milwaukee County; | MRO | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| January | 2016-01-10 | 8:46 PM | 1/11/2016 | 5:25 AM | Maine: Connecticut: Massachusetts: Vermont: New Hampshire: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 59,859 | Weather |
| January | 2016-01-11 | 8:16 PM | 1/11/2016 | 11:00 PM | Pennsylvania: Chester County; | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| January | 2016-01-14 | 8:27 AM | 1/14/2016 | 12:00 PM | Delaware: | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| January | 2016-01-17 | 12:00 PM | 1/17/2016 | 1:00 PM | Utah: Salt Lake County; | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| January | 2016-01-22 | 3:52 PM | 1/24/2016 | 12:30 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 150,000 | Weather |
| January | 2016-01-23 | 7:49 AM | 1/23/2016 | 9:05 AM | New Jersey: | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 50,900 | Weather |
| February | 2016-02-05 | 11:21 AM | 2/6/2016 | 3:48 PM | Connecticut: Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 115,057 | Weather |
| February | 2016-02-07 | 11:30 AM | Unknown | Unknown | New York: Orange County | NPCC | Suspected Cyber Attack | Cyber Attack | Unknown | Unknown | Cyber Attack |
| February | 2016-02-07 | 1:21 PM | 2/7/2016 | 1:42 PM | Utah: Salt Lake County | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| February | 2016-02-07 | 2:58 PM | Unknown | Unknown | Oregon: Klamath County | WECC | Suspected Physical Attack | Sabotage | Unknown | Unknown | Physical Attack |
| February | 2016-02-13 | 12:44 PM | 2/13/2016 | 4:27 PM | California | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 7 | 4,300 | Islanding |
| February | 2016-02-16 | 8:35 AM | 2/16/2016 | 5:28 PM | Virginia: Roanoke County, Montgomery County; West Virginia: Kanawha County, Cabell County; Tennessee: Sullivan County; | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 52,640 | Weather |
| February | 2016-02-19 | 10:00 PM | 2/20/2016 | 11:13 PM | Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 145,314 | Weather |
| February | 2016-02-21 | 3:54 PM | 2/21/2016 | 5:07 PM | Oregon: Klamath County | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| February | 2016-02-24 | 9:10 AM | 2/24/2016 | 10:15 AM | Delaware | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | physical Attack |
| February | 2016-02-24 | 2:45 PM | 2/25/2016 | 5:00 AM | North Carolina: South Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | 400 | 284,610 | Weather |
| February | 2016-02-25 | 1:44 AM | 2/25/2016 | 2:45 PM | Connecticut: Maine: Massachusetts: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 114,190 | Weather |
| February | 2016-02-26 | 12:01 AM | Unknown | Unknown | California: San Bernardino County | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| February | 2016-02-26 | 4:35 PM | 2/26/2016 | 8:22 PM | Arizona: Maricopa County | WECC | Suspected Physical Attack | Sabotage - Operator Action(s) | 2 | 2,713 | physical Attack |
| March | 2016-03-01 | 1:35 PM | Unknown | Unknown | Idaho: Ada County; | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | physical Attack |
| March | 2016-03-01 | 3:00 PM | Unknown | Unknown | Washington: King County, Whatcom County, Kitsap County, Skagit County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 56,000 | Weather |
| March | 2016-03-03 | 11:00 AM | 4/6/2016 | 7:47 PM | California: San Bernardino County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| March | 2016-03-08 | 12:00 AM | 3/8/2016 | 12:00 AM | Idaho: Bannock County; | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | physical Attack |
| March | 2016-03-10 | 4:00 AM | 3/11/2016 | 11:59 AM | Washington: Kitsap County, King County, Whatcom County, Island County, Skagit County; | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| March | 2016-03-13 | 2:00 PM | Unknown | Unknown | Washington: Island County, Skagit County, Whatcom County, King County, Kitsap County, Pierce County, Thurston County; | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| March | 2016-03-13 | 4:55 PM | Unknown | Unknown | Washington: | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| March | 2016-03-23 | 5:00 AM | 3/25/2016 | 11:59 PM | Colorado: Denver, City and County of[12]; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | 0 | 0 | Weather |
| March | 2016-03-27 | 12:00 PM | 3/27/2016 | 1:00 PM | Nevada: Clark County; | WECC | Suspected Physical Attack | Sabotage | Unknown | 110,000 | Physical Attack |
| March | 2016-03-30 | 9:12 PM | 3/31/2016 | 3:00 PM | Massachusetts: Middlesex County[13]; | NPCC | Suspected Physical Attack | Sabotage | 200 | 50,500 | Physical Attack |
| April | 2016-04-01 | 4:37 PM | 4/1/2016 | 6:00 PM | Florida: Hillsborough County | FRCC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| April | 2016-04-02 | 11:08 AM | 4/2/2016 | 11:33 AM | California | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 360 | 0 | Operations |
| April | 2016-04-12 | 11:30 AM | 4/12/2016 | 4:43 PM | Washington: Pend Oreille County | WECC | Suspected Cyber Attack | Cyber Attack | 0 | 0 | Cyber Attack |
| April | 2016-04-14 | 4:49 PM | 4/15/2016 | 8:42 PM | Maryland: Baltimore County | RFC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| April | 2016-04-15 | 10:00 AM | 4/15/2016 | 11:00 AM | Utah: Weber County | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| April | 2016-04-18 | 5:05 AM | 4/20/2016 | 7:55 AM | Texas: Harris County | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 415,103 | Weather |
| April | 2016-04-27 | 1:36 PM | Unknown | Unknown | Tennessee | SERC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| April | 2016-04-27 | 6:00 PM | 4/27/2016 | 6:05 PM | Texas: Rusk County | TRE | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| April | 2016-04-27 | 5:50 AM | 4/28/2016 | 1:35 AM | Texas: Harris County | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 214,864 | Weather |
| May | 2016-05-07 | 7:49 AM | 5/7/2016 | 9:02 AM | New York: Dutchess County; | NPCC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| May | 2016-05-08 | 9:12 AM | Unknown | Unknown | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | Unknown | Unknown | Islanding |
| May | 2016-05-10 | 8:45 PM | 5/13/2016 | 3:00 AM | Texas: Dallas County, Tarrant County, Parker County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Distribution Interruption | Unknown | 85,000 | Distribution Interruption |
| May | 2016-05-14 | 9:25 PM | 5/15/2016 | 5:24 PM | Missouri: | SERC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| May | 2016-05-19 | 9:36 PM | 5/20/2016 | 1:00 AM | Utah: | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 461 | 85,179 | Operations |
| May | 2016-05-20 | 12:00 AM | 5/22/2016 | 5:00 AM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Distribution Interruption | Unknown | 85,000 | Distribution Interruption |
| May | 2016-05-20 | 1:15 AM | Unknown | Unknown | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | Unknown | 57,184 | Weather |
| May | 2016-05-24 | 8:00 AM | Unknown | Unknown | Missouri: | SERC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| May | 2016-05-26 | 9:29 PM | 5/27/2016 | 12:40 AM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Transmission Interruption | 82 | 56,645 | Transmission Interruption |
| May | 2016-05-31 | 7:30 AM | 6/13/2016 | 7:27 AM | New York: Tompkins County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 150 | Unknown | Fuel Supply Deficiency |
| June | 2016-06-07 | 12:00 PM | 6/7/2016 | 12:15 PM | Utah | WECC | Suspected Physical Attack | Sabotage | 0 | 0 | Physical Attack |
| June | 2016-06-14 | 7:59 AM | 6/14/2016 | 8:00 AM | New Jersey | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| June | 2016-06-17 | 4:30 AM | 6/17/2016 | 4:31 AM | Delaware | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| June | 2016-06-17 | 3:40 PM | 6/18/2016 | 8:34 AM | Georgia, Alabama, Mississippi, Florida | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather | 304 | 91,260 | Weather |
| July | 2016-07-02 | 4:00 AM | 7/4/2016 | 12:40 AM | Oregon: Multnomah County | WECC | Suspected Physical Attack | Actual Physical Event | 0 | 0 | Physical Attack |
| July | 2016-07-05 | 2:45 AM | 7/6/2016 | 3:00 AM | Texas: Dallas County, Tarrant County | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 52,000 | Weather |
| July | 2016-07-05 | 5:30 PM | 7/6/2016 | 4:00 PM | Minnesota, Wisconsin | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 250,000 | Weather |
| July | 2016-07-07 | 5:53 AM | 7/7/2016 | 8:40 AM | North Carolina: New Hanover County | SERC | Actual Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| July | 2016-07-07 | 4:20 AM | 7/7/2016 | 8:00 AM | Kansas: Johnson County; Missouri: Jackson County, Platte County, Cass County, Buchanan County, Atchison County, Andrew County, Clay County, Nodaway County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 58,500 | Weather |
| July | 2016-07-08 | 6:00 PM | Unknown | Unknown | West Virginia: Virginia | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 62,961 | Weather |
| July | 2016-07-08 | 7:00 PM | 7/9/2016 | 12:00 AM | Michigan: Wayne County, Oakland County, Macomb County, St. Clair County, Lapeer County, Tuscola County, Sanilac County, Huron County | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 160,895 | Weather |
| July | 2016-07-08 | 8:50 PM | 7/9/2016 | 7:25 PM | North Carolina | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 600 | 203,345 | Weather |
| July | 2016-07-09 | 5:45 PM | 7/11/2016 | 2:00 PM | Texas: Dallas County | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 62,000 | Weather |
| July | 2016-07-12 | 2:10 PM | 7/12/2016 | 8:33 PM | Puerto Rico | PR | Voltage Reduction | System Operations | 450 | 218,000 | Operations |
| July | 2016-07-13 | 1:00 PM | 7/13/2016 | 1:01 PM | Washington | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| July | 2016-07-13 | 3:00 PM | Unknown | Unknown | Tennessee: Shelby County | SERC | Public Appeal | System Operations | Unknown | Unknown | Public Appeal |
| July | 2016-07-14 | 5:30 PM | 7/16/2016 | 8:00 PM | Oklahoma: Arkansas | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 7,300 | Weather |
| July | 2016-07-14 | 2:44 PM | 7/15/2016 | 4:00 AM | Oklahoma | SPP | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 96,966 | Weather |
| July | 2016-07-14 | 4:30 PM | 7/16/2016 | 12:00 AM | Arkansas: Louisiana: Mississippi: Texas | SPP, SERC, TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 170,244 | Weather |
| July | 2016-07-19 | 3:45 PM | 7/19/2016 | 7:29 PM | Idaho | WECC | Islanding, Uncontrolled Loss 300+ MW | System Operations | 290 | Unknown | Operations |
| July | 2016-07-19 | 3:45 PM | 7/19/2016 | 7:25 PM | Idaho | WECC | Islanding, Uncontrolled Loss 300+ MW | System Operations | 485 | Unknown | Operations |
| July | 2016-07-21 | 7:21 PM | 7/22/2016 | 12:09 AM | Puerto Rico | PR | Load Shed 100+ MW, Voltage Reduction | System Operations | 200 | 266,000 | Load Shed |
| July | 2016-07-21 | 6:18 AM | 7/21/2016 | 2:45 PM | Delaware: New Castle County | RFC | Suspected Physical Attack | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2016-07-22 | 11:50 PM | 7/23/2016 | 9:10 AM | Massachusetts: Connecticut: Rhode Island: New Hampshire: Vermont: Maine | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,058 | Weather |
| July | 2016-07-23 | 3:15 PM | 7/23/2016 | 7:53 PM | Pennsylvania: Cambria County | RFC | Voltage Reduction | System Operations | 87 | Unknown | Operations |
| July | 2016-07-23 | 7:30 PM | 7/24/2016 | 7:30 AM | Connecticut: Massachusetts: New Hampshire: Vermont: Rhode Island | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 101,073 | Weather |
| July | 2016-07-25 | 6:51 PM | 7/26/2016 | 2:19 AM | Puerto Rico | PR | Voltage Reduction | System Operations | 0 | 0 | Operations |
| July | 2016-07-26 | 6:51 PM | 7/27/2016 | 1:45 AM | Puerto Rico | PR | Voltage Reduction | System Operations | 25 | 37,100 | Operations |
| July | 2016-07-27 | 6:50 PM | 7/28/2016 | 1:38 AM | Puerto Rico | PR | Voltage Reduction | System Operations | 80 | 106,300 | Operations |
| July | 2016-07-28 | 6:51 PM | 7/29/2016 | 2:02 AM | Puerto Rico | PR | Voltage Reduction | System Operations | 22 | 21,600 | Operations |
| July | 2016-07-29 | 7:09 PM | 7/29/2016 | 7:57 PM | Puerto Rico | PR | Voltage Reduction | System Operations | 0 | 0 | Operations |
| August | 2016-08-04 | 2:15 PM | 8/4/2016 | 2:23 PM | Delaware: New Castle County; | RFC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| August | 2016-08-07 | 6:39 PM | 8/7/2016 | 8:27 PM | New Mexico: Bernalillo County; | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | Unknown | Unknown | Operations |
| August | 2016-08-10 | 6:00 AM | Unknown | Unknown | California: Butte County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| August | 2016-08-11 | 4:30 PM | 8/11/2016 | 7:15 PM | Ohio: | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 62,140 | Weather |
| August | 2016-08-13 | 11:42 AM | 8/13/2016 | 2:07 PM | South Carolina: | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 506 | 0 | Operations |
| August | 2016-08-20 | 2:18 PM | 8/20/2016 | 9:19 PM | New York: | NPCC | Actual Physical Attack | Actual Physical Event | Unknown | 40,000 | Physical Attack |
| August | 2016-08-23 | 5:00 PM | 8/24/2016 | 12:05 AM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 72,200 | Weather |
| August | 2016-08-24 | 7:18 PM | 8/24/2016 | 7:47 PM | Washington: King County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 9232 | Unknown | Islanding |
| August | 2016-08-24 | 6:13 PM | 8/24/2016 | 7:14 PM | Puerto Rico: | PR | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | System Operations | 600 | 400,000 | Operations |
| August | 2016-08-25 | 6:40 PM | 8/26/2016 | 6:19 PM | Oregon: Crook County; | WECC | Suspected Physical Attack | Vandalism | 0 | 0 | Physical Attack |
| August | 2016-08-31 | 2:52 PM | Unknown | Unknown | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 0 | 0 | Islanding |
| August | 2016-08-31 | 9:45 AM | 8/31/2016 | 9:55 AM | Colorado: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2016-09-01 | 10:00 PM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 100 | Unknown | Weather |
| September | 2016-09-02 | 5:45 AM | 9/3/2016 | 12:30 AM | Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,000 | Weather |
| September | 2016-09-02 | 12:40 AM | 9/4/2016 | 8:00 PM | Florida: Leon County, Wakulla County; | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 450 | 75,000 | Weather |
| September | 2016-09-02 | 4:00 AM | 9/2/2016 | 4:00 PM | Florida: Alachua County, Bay County, Citrus County, Columbia County, Dixie County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Suwannee County, Taylor County, Volusia County, Wakulla County; | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 225 | 90,000 | Weather |
| September | 2016-09-06 | 6:12 PM | 9/6/2016 | 9:24 PM | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 300 | Unknown | Islanding |
| September | 2016-09-08 | 8:30 AM | 9/25/2016 | 12:00 AM | New York: Tompkins County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 210 | Unknown | Fuel Supply Deficiency |
| September | 2016-09-08 | 2:49 PM | 9/8/2016 | 3:03 PM | Washington: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 0 | 0 | Islanding |
| September | 2016-09-10 | 9:42 AM | 9/10/2016 | 9:57 AM | Washington: Clark County; | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Generation Inadequacy | 135 | Unknown | Generation Interruption |
| September | 2016-09-11 | 12:05 PM | 9/11/2016 | 3:10 PM | Connecticut: Massachusetts: New Hampshire: Rhode Island: Vermont: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57,960 | Weather |
| September | 2016-09-12 | 12:30 PM | 9/12/2016 | 5:56 PM | New Mexico: Bernalillo County, Sandoval County, Santa Fe County, Valencia County; | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Generation Inadequacy | 110 | 53,753 | Generation Interruption |
| September | 2016-09-21 | 2:30 PM | 9/24/2016 | 2:30 AM | Puerto Rico: | Complete operational failure or shut-down of the transmission and/or distribution electrical system | System Operations | 2750 | 1,475,000 | Operations | |
| September | 2016-09-21 | 7:44 PM | 9/21/2016 | 9:17 PM | Texas: Lubbock County; | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Event | 0 | 0 | Physical Attack |
| September | 2016-09-22 | 10:56 AM | 9/22/2016 | 11:41 AM | Iowa: Black Hawk County; | MRO | Complete operational failure or shut-down of the transmission and/or distribution electrical system | System Operations | 69 | 19,124 | Operations |
| September | 2016-09-25 | 12:49 PM | 9/25/2016 | 6:20 PM | Utah: Kane County, Garfield County; Arizona: Coconino County, Mohave County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 20 | 10,000 | Physical Attack |
| October | 2016-10-01 | 12:24 PM | 10/02/2016 | 2:04 AM | California: Mendocino County; | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Actual Physical Event | 0 | 0 | Physical Attack |
| October | 2016-10-02 | 11:30 PM | 10/05/2016 | 8:00 AM | Utah: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Transmission Interruption | 50 | 4,000 | Transmission Interruption |
| October | 2016-10-03 | 3:09 PM | 10/04/2016 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Public Appeal | Unknown | Unknown | Public Appeal |
| October | 2016-10-05 | 3:51 PM | Unknown | Unknown | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2016-10-05 | 11:32 AM | 10/05/2016 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Public Appeal | Unknown | Unknown | Public Appeal |
| October | 2016-10-06 | 9:50 AM | 10/06/2016 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Public Appeal | Unknown | Unknown | Public Appeal |
| October | 2016-10-06 | 7:30 PM | 10/8/2016 | 6:00 PM | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 5600 | 1,200,000 | Weather |
| October | 2016-10-07 | 11:08 AM | 10/07/2016 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Generation Inadequacy | Unknown | Unknown | Generation Interruption |
| October | 2016-10-07 | 4:22 PM | 10/12/2016 | 11:00 AM | Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 122 | 36,384 | Weather |
| October | 2016-10-07 | 8:00 AM | 10/09/2016 | 1:00 PM | Florida: Alachua County, Bay County, Citrus County, Columbia County, Dixie County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Suwannee County, Taylor County, Volusia County, Wakulla County; | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 413 | 165,000 | Weather |
| October | 2016-10-07 | 10:45 PM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| October | 2016-10-07 | 11:00 PM | Unknown | Unknown | South Carolina: Allendale County, Bamberg County, Beaufort County, Berkeley County, Charleston County, Chesterfield County, Clarendon County, Colleton County, Darlington County, Dorchester County, Florence County, Georgetown County, Hampton County, Horry County, Jasper County, Kershaw County, Lee County, Marion County, Marlboro County, Orangeburg County, Richland County, Sumter County, Williamsburg County; | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| October | 2016-10-08 | 2:05 PM | 10/09/2016 | 6:06 AM | North Carolina: | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Severe Weather | Unknown | 44,875 | Weather |
| October | 2016-10-08 | 1:10 AM | Unknown | Unknown | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1050 | 290,824 | Weather |
| October | 2016-10-08 | 8:21 AM | 10/13/2016 | 5:30 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| October | 2016-10-10 | 1:15 PM | 10/10/2016 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Generation Inadequacy | Unknown | Unknown | Generation Interruption |
| October | 2016-10-12 | 12:09 PM | 10/12/2016 | 1:16 PM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 4 | 1,671 | Physical Attack |
| October | 2016-10-18 | 2:06 PM | 10/21/2016 | 3:00 PM | Oregon: Deschutes County, Lake County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2016-10-20 | 12:30 PM | 10/20/2016 | 12:31 PM | Oregon: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2016-10-25 | 7:40 AM | 10/27/2016 | 7:40 AM | Tennessee: Shelby County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2016-10-26 | 5:26 AM | 10/26/2016 | 5:27 AM | Wyoming: Sweetwater County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2016-10-28 | 1:29 PM | 10/28/2016 | 1:38 PM | California: Plumas County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Islanding | 4 | 482 | Islanding |
| October | 2016-10-31 | 8:06 AM | 10/31/2016 | 3:53 PM | North Carolina: Stokes County; | SERC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Actual Physical Event | 0 | 0 | Physical Attack |
| November | 2016-11-01 | 8:55 PM | Unknown | Unknown | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2016-11-09 | 11:59 AM | 11/09/2016 | 6:15 PM | California: Stanislaus County, San Joaquin County, Alameda County, Tuolumne County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Attack | 0 | 0 | Cyber Attack |
| November | 2016-11-09 | 6:44 AM | 11/09/2016 | 7:44 AM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2016-12-08 | 1:00 AM | 12/08/2016 | 2:30 AM | Oregon: Multnomah County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2016-12-11 | 7:45 AM | 12/11/2016 | 7:46 AM | Utah: Utah County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2016-12-13 | 2:09 PM | 12/13/2016 | 2:30 PM | California: Riverside County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| December | 2016-12-15 | 6:30 AM | Unknown | Unknown | California: Merced County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| December | 2016-12-16 | 7:45 AM | 12/16/2016 | 8:45 AM | Oregon: Multnomah County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2016-12-26 | 4:00 AM | 12/26/2016 | 6:00 AM | Washington: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2016-12-28 | 4:03 AM | 12/31/2016 | 6:00 AM | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| December | 2016-12-30 | 8:55 AM | 12/30/2016 | 8:56 AM | Vermont: Chittenden County; | NPCC | Cyber event that could potentially impact electric power system adequacy or reliability | Other | 0 | 0 | Cyber Attack |
| December | 2016-12-30 | 2:30 AM | 12/30/2016 | 7:00 PM | Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Weather or Natural Disaster | Unknown | 85,263 | Weather |
| January | 2017-01-05 | 4:56 PM | 01/05/2017 | 4:57 PM | Florida: Martin County; | FRCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspected Physical Attack | 0 | 0 | Physical Attack |
| January | 2017-01-08 | 11:59 PM | Unknown | Unknown | California | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| January | 2017-01-08 | 9:07 AM | 01/13/2017 | 2:30 PM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 106,000 | Weather |
| January | 2017-01-10 | 7:30 PM | 01/13/2017 | 2:30 PM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 87,000 | Weather |
| January | 2017-01-15 | 6:35 AM | 01/15/2017 | 7:44 AM | California: Los Angeles County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Transmission Disruption | 176 | 126,000 | Transmission Interruption |
| January | 2017-01-15 | 9:27 AM | 01/17/2017 | 1:58 AM | Oklahoma: Harper County; | SPP | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 1 | 788 | Weather |
| January | 2017-01-18 | 6:05 PM | 01/19/2017 | 12:05 AM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 75,000 | Weather |
| January | 2017-01-22 | 6:00 AM | Unknown | Unknown | California | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| January | 2017-01-22 | 4:00 PM | 01/23/2017 | 3:26 AM | Alabama: Georgia: Mississippi: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 100 | 29,965 | Weather |
| January | 2017-01-22 | 4:15 AM | 01/24/2017 | 2:00 PM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 97 | 64,000 | Weather |
| February | 2017-02-02 | 1:04 AM | 2/2/2017 | 5:00 AM | New Mexico: Bernalillo County, Santa Fe County; | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Transmission Interruption | 396 | 149,223 | Transmission Interruption |
| February | 2017-02-02 | 1:11 AM | Unknown | Unknown | New Mexico: Bernalillo County; | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Transmission Interruption | 400 | Unknown | Transmission Interruption |
| February | 2017-02-06 | 1:00 AM | 2/6/2017 | 7:30 PM | Washington: Skagit County, King County, Kitsap County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 103,000 | Weather |
| February | 2017-02-09 | 4:05 PM | 2/10/2017 | 5:15 AM | Connecticut: Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 11,525 | Weather |
| February | 2017-02-11 | 3:46 PM | 2/11/2017 | 3:50 PM | Utah | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| February | 2017-02-13 | 1:00 PM | 2/15/2017 | 1:35 PM | North Carolina: Union County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| February | 2017-02-17 | 4:32 AM | 2/17/2017 | 5:02 AM | Missouri: Arkansas: Oklahoma: Texas: | SPP | Cyber event that could potentially impact electric power system adequacy or reliability | System Operations | 0 | 0 | Cyber Attack |
| February | 2017-02-17 | 1:00 PM | 2/17/2017 | 1:15 PM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| February | 2017-02-17 | 3:00 PM | 2/20/2017 | 11:00 AM | California: Los Angeles County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 111,591 | Weather |
| February | 2017-02-17 | 8:09 AM | 2/22/2017 | 7:30 PM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 254 | 169,250 | Weather |
| March | 2017-03-01 | 8:30 AM | 03/01/2017 | 2:00 PM | Tennessee: Kentucky: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 58,000 | Weather |
| March | 2017-03-01 | 11:49 AM | 03/02/2017 | 9:30 PM | Kentucky: West Virginia: | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 98,575 | Weather |
| March | 2017-03-02 | 12:20 PM | 03/02/2017 | 11:45 PM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 54,316 | Weather |
| March | 2017-03-06 | 8:00 PM | 03/07/2017 | 1:00 AM | Missouri: Jackson County, Platte County, Cass County, Lafayette County, Chariton County, Carroll County, Clay County, Johnson County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 97,734 | Weather |
| March | 2017-03-08 | 3:33 PM | Unknown | Unknown | New York | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50,000 | Weather |
| March | 2017-03-08 | 11:30 AM | 03/08/2017 | 7:52 PM | Ohio | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 71,012 | Weather |
| March | 2017-03-08 | 1:30 PM | 03/08/2017 | 4:30 PM | New York | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 106,869 | Weather |
| March | 2017-03-08 | 9:30 AM | 03/11/2017 | 5:00 AM | Michigan: Jackson County, Calhoun County, Ingham County, Hillsdale County, Washtenaw County, Kent County, Ottawa County, Midland County, Saginaw County; | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 343,000 | Weather |
| March | 2017-03-08 | 12:00 PM | 03/11/2017 | 11:31 AM | Michigan | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 800,000 | Weather |
| March | 2017-03-12 | 9:56 AM | 03/12/2017 | 11:20 AM | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 1 | Physical Attack |
| March | 2017-03-14 | 12:32 PM | Unknown | Unknown | Connecticut: Massachusetts: Rhode Island: New Hampshire: Maine: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 69,647 | Weather |
| March | 2017-03-21 | 8:00 PM | 03/22/2017 | 9:15 AM | Georgia | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 857 | 257,000 | Weather |
| March | 2017-03-24 | 6:29 AM | 03/24/2017 | 7:13 AM | Oregon: Clatsop County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Sabotage | 0 | 0 | Physical Attack |
| March | 2017-03-28 | 4:07 PM | 03/28/2017 | 4:08 PM | Oregon: Josephine County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2017-03-29 | 3:30 AM | 03/31/2017 | 6:00 AM | Texas | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 175,000 | Weather |
| March | 2017-03-31 | 7:15 PM | 03/31/2017 | 9:07 PM | Mississippi: DeSoto County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2017-04-03 | 11:00 AM | 04/03/2017 | 8:00 PM | Alabama, Georgia | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 290 | 86,330 | Weather |
| April | 2017-04-06 | 7:00 PM | Unknown | Unknown | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 100,000 | Weather |
| April | 2017-04-07 | 4:16 AM | Unknown | Unknown | California: Fresno County | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| April | 2017-04-07 | 4:33 AM | 04/07/2017 | 8:20 AM | Oregon | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 100 | 64,852 | Weather |
| April | 2017-04-07 | 8:15 AM | 04/08/2017 | 12:14 AM | Oregon: Multnomah County, Washington County, Marion County, Clackamas County | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 153,867 | Weather |
| April | 2017-04-13 | 7:50 AM | 04/13/2017 | 8:07 AM | Washington: Pierce County | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Sabotage | 53 | 10,000 | Physical Attack |
| April | 2017-04-17 | 9:25 AM | 04/17/2017 | 9:26 AM | Utah: Emery County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Sabotage | 0 | 0 | Physical Attack |
| April | 2017-04-20 | 4:00 PM | 04/20/2017 | 6:00 PM | Wyoming: Converse County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2017-04-21 | 9:06 AM | 04/21/2017 | 5:45 PM | California: San Francisco, City and County of[10] | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | 130 | 88,000 | Operations |
| April | 2017-04-21 | 10:34 AM | 04/21/2017 | 3:55 PM | Kentucky: Bullitt County | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2017-04-23 | 11:55 PM | 04/23/2017 | 11:56 PM | Oregon: Multnomah County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2017-04-24 | 5:32 AM | 04/24/2017 | 6:33 AM | North Carolina: Mecklenburg County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 240 | 74,698 | Weather |
| April | 2017-04-30 | 1:00 AM | 04/30/2017 | 5:45 PM | Arkansas, Louisiana, Mississippi | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 145,174 | Weather |
| May | 2017-05-01 | 11:14 PM | 05/01/2017 | 11:34 PM | Ohio | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 92,390 | Weather |
| May | 2017-05-03 | 6:58 PM | 05/03/2017 | 9:15 PM | California | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Generation Inadequacy | 572 | 0 | Generation Interruption |
| May | 2017-05-03 | 7:05 PM | 05/03/2017 | 9:00 PM | California | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Generation Inadequacy | 878 | Unknown | Generation Interruption |
| May | 2017-05-03 | 11:00 PM | Unknown | Unknown | Pennsylvania: Philadelphia County, Montgomery County | RFC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2017-05-04 | 5:00 AM | 05/04/2017 | 10:00 PM | Alabama: Georgia | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 200 | 60,377 | Weather |
| May | 2017-05-07 | 5:15 AM | Unknown | Unknown | California: Fresno County | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| May | 2017-05-07 | 11:30 PM | 05/08/2017 | 5:00 AM | Kentucky: Daviess County | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Generation Inadequacy | 80 | 0 | Generation Interruption |
| May | 2017-05-11 | 11:05 AM | 05/11/2017 | 1:05 PM | Washington: Yakima County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2017-05-19 | 5:30 AM | Unknown | Unknown | Missouri: St. Louis County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 70,696 | Weather |
| May | 2017-05-21 | 4:44 PM | 05/21/2017 | 5:43 PM | Idaho: Lincoln County, Jerome County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 21 | 9,598 | Physical Attack |
| May | 2017-05-23 | 5:02 AM | 05/23/2017 | 8:40 AM | Tennessee: Davidson County | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 10 | 4,700 | Physical Attack |
| May | 2017-05-27 | 11:00 PM | Unknown | Unknown | Tennessee: Shelby County, Putnam County, Knox County, Davidson County, Hamilton County; Alabama: Madison County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 116,000 | Weather |
| May | 2017-05-27 | 11:10 PM | Unknown | Unknown | Tennessee: Shelby County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 391 | 188,000 | Weather |
| May | 2017-05-28 | 4:27 PM | 05/28/2017 | 4:28 PM | Nevada: Clark County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2017-05-28 | 7:30 PM | 05/29/2017 | 10:00 PM | Louisiana: Texas | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 103,000 | Weather |
| May | 2017-05-28 | 7:30 PM | 05/29/2017 | 10:00 PM | Texas: Louisiana | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 103,000 | Weather |
| June | 2017-06-07 | 1:12 PM | 06/07/2017 | 1:13 PM | Washington: Yakima County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| June | 2017-06-11 | 2:39 PM | 06/11/2017 | 5:55 PM | Michigan | RFC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 63 | Unknown | Transmission Interruption |
| June | 2017-06-11 | 1:25 PM | 06/11/2017 | 7:15 PM | Wisconsin | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 53,610 | Weather |
| June | 2017-06-11 | 7:00 AM | 06/11/2017 | 11:22 AM | Minnesota | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 70,000 | Weather |
| June | 2017-06-15 | 5:00 PM | 06/15/2017 | 10:00 PM | Alabama, Georgia | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 275 | 82,713 | Weather |
| June | 2017-06-16 | 8:00 PM | 06/17/2017 | 6:00 AM | Arkansas | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 76,000 | Weather |
| June | 2017-06-16 | 8:00 PM | Unknown | Unknown | Nebraska: Cass County, Douglas County, Sarpy County | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 76,000 | Weather |
| June | 2017-06-17 | 9:00 PM | 06/18/2017 | 7:00 AM | Kansas, Missouri: Jackson County, Platte County, Clay County, Cass County | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 84737 | Weather |
| June | 2017-06-21 | 12:00 AM | 06/21/2017 | 1:00 AM | Oregon: Baker County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Physical Attack | 0 | 0 | Physical Attack |
| June | 2017-06-22 | 6:00 PM | 06/25/2017 | 12:45 PM | Michigan: Wayne County, Monroe County | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 118,631 | Weather |
| June | 2017-06-29 | 4:00 AM | Unknown | Unknown | Louisiana: Orleans Parish | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 130 | 6,467 | Physical Attack |
| June | 2017-06-30 | 7:45 AM | 06/30/2017 | 7:46 AM | Idaho: Ada County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2017-07-06 | 12:00 AM | Unknown | Unknown | Idaho: Jerome County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2017-07-07 | 3:30 AM | 07/08/2017 | 7:30 PM | Michigan: Kent County, Ottawa County, Muskegon County, Barry County, Oceana County, Eaton County | RFC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 160000 | Weather |
| July | 2017-07-08 | 6:52 PM | 07/09/2017 | 8:00 AM | California: Los Angeles County | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Transmission Interruption | 645 | 176867 | Transmission Interruption |
| July | 2017-07-11 | 10:00 AM | 07/11/2017 | 12:00 PM | Minnesota | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2017-07-12 | 12:25 PM | 07/15/2017 | 9:00 AM | Tennessee | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2017-07-12 | 12:25 PM | Unknown | Unknown | Tennessee: Shelby County | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | Unknown | Unknown | Physical Attack |
| July | 2017-07-18 | 4:03 AM | Unknown | Unknown | Missouri | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | Unknown | 700 | Physical Attack |
| July | 2017-07-18 | 4:23 PM | 07/18/2017 | 6:39 PM | Nevada | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Severe Weather | 0 | 0 | Weather |
| July | 2017-07-20 | 1:00 AM | 07/20/2017 | 9:46 AM | Utah: Beaver County | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2017-07-22 | 10:00 PM | 07/23/2017 | 12:00 PM | Missouri: Clay County, Jackson County, Lafayette County, Platte County; Kansas: Johnson County, Miami County, Wyandotte County | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 112540 | Weather |
| July | 2017-07-22 | 10:00 PM | Unknown | Unknown | Missouri | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 115000 | Weather |
| July | 2017-07-22 | 10:00 PM | Unknown | Unknown | Missouri | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 131000 | Weather |
| July | 2017-07-23 | 4:00 AM | Unknown | Unknown | Missouri: Illinois | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 82000 | Weather |
| July | 2017-07-27 | 6:00 AM | 07/27/2017 | 11:29 AM | California: Butte County | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| August | 2017-08-05 | 1:20 PM | 08/05/2017 | 2:20 PM | California: Humboldt County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| August | 2017-08-21 | 11:41 PM | 08/22/2017 | 12:21 AM | California: Plumas County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 1 | 2 | Islanding |
| August | 2017-08-25 | 6:17 PM | 09/02/2017 | 5:00 PM | Texas: Matagorda County, Nueces County, Aransas County, Refugio County, San Patricio County, Calhoun County, Victoria County, Jackson County, Live Oak County, Jim Wells County, Bee County, Lavaca County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 220400 | Weather |
| August | 2017-08-25 | 6:30 PM | 09/05/2017 | 5:00 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 330000 | Weather |
| August | 2017-08-26 | 6:26 AM | 09/08/2017 | 12:00 AM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 1076868 | Weather |
| August | 2017-08-26 | 12:39 AM | 08/26/2017 | 12:52 AM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | Unknown | Unknown | Weather |
| August | 2017-08-27 | 5:10 AM | 09/08/2017 | 12:00 AM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 1076868 | Weather |
| August | 2017-08-30 | 2:15 AM | Unknown | Unknown | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 78500 | Weather |
| August | 2017-08-31 | 2:49 PM | 08/31/2017 | 5:14 PM | California: Los Angeles County; | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Severe Weather | 100 | 0 | Weather |
| September | 2017-09-01 | 3:41 PM | 09/01/2017 | 8:30 PM | California: | WECC | Load shedding of 100 Megawatts or more implemented under emergency operational policy | Severe Weather | 337 | 0 | Weather |
| September | 2017-09-09 | 12:00 AM | Unknown | Unknown | Florida: Hillsborough County, Pasco County, Polk County; | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1275 | 425000 | Weather |
| September | 2017-09-09 | 12:30 PM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 3500000 | Weather |
| September | 2017-09-10 | 8:37 PM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 452555 | Weather |
| September | 2017-09-10 | 6:35 PM | 09/13/2017 | 5:00 PM | Florida: Alachua County, Bay County, Brevard County, Citrus County, Columbia County, Dixie County, Flagler County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Leon County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Suwannee County, Taylor County, Volusia County, Wakulla County; | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 4500 | 1000000 | Weather |
| September | 2017-09-11 | 12:30 AM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 200 | 20000 | Weather |
| September | 2017-09-11 | 2:27 AM | 09/15/2017 | 8:44 PM | Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 132 | 39659 | Weather |
| September | 2017-09-11 | 12:55 PM | 09/12/2017 | 8:00 AM | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 687 | 154832 | Weather |
| September | 2017-09-11 | 5:30 PM | 09/13/2017 | 9:30 AM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 365 | 265729 | Weather |
| October | 2017-10-04 | 2:30 AM | Unknown | Unknown | Tennessee: Shelby County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2017-10-04 | 1:20 AM | 10/04/2017 | 3:00 AM | Mississippi: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | Unknown | Unknown | Physical Attack |
| October | 2017-10-08 | 3:00 AM | Unknown | Unknown | Alabama: Florida: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 306 | 91945 | Weather |
| October | 2017-10-09 | 2:03 AM | 10/17/2017 | 1:30 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | 177 | 117900 | Weather |
| October | 2017-10-09 | 6:44 AM | Unknown | Unknown | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 100 | Unknown | Weather |
| October | 2017-10-12 | 9:09 AM | Unknown | Unknown | Mississippi: Coahoma County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | Unknown | Unknown | Public Appeal |
| October | 2017-10-16 | 3:45 PM | 10/16/2017 | 4:09 PM | Washington: Montana: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2017-10-16 | 3:55 PM | 10/16/2017 | 4:10 PM | Washington: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2017-10-19 | 4:01 PM | 10/19/2017 | 4:02 PM | Utah: Salt Lake County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspected Physical Attack | 0 | 0 | Physical Attack |
| October | 2017-10-20 | 6:30 PM | 10/20/2017 | 10:22 PM | Texas: | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2017-10-20 | 3:44 AM | 10/20/2017 | 3:45 AM | Washington: | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Severe Weather | 900 | Unknown | Weather |
| October | 2017-10-22 | 8:45 AM | 10/22/2017 | 2:00 PM | Louisiana: Mississippi: Arkansas: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| October | 2017-10-23 | 5:50 PM | 10/24/2017 | 6:17 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 440 | 115144 | Weather |
| October | 2017-10-25 | 12:00 PM | 10/25/2017 | 4:00 PM | California: | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | Suspicious Activity | Unknown | Unknown | Cyber Attack |
| October | 2017-10-26 | 5:50 PM | Unknown | Unknown | Montana: Big Horn County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| October | 2017-10-26 | 8:17 AM | 10/26/2017 | 8:41 AM | Washington: Whatcom County; Montana: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2017-10-26 | 8:17 AM | 10/26/2017 | 8:41 AM | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2017-10-29 | 11:40 PM | 11/01/2017 | 6:08 PM | Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 310453 | Weather |
| November | 2017-11-01 | 3:40 PM | 11/01/2017 | 10:00 PM | Kentucky: Daviess County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Generation Inadequacy | 0 | 0 | Generation Interruption |
| November | 2017-11-05 | 7:35 PM | 11/05/2017 | 11:09 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 89216 | Weather |
| November | 2017-11-07 | 12:29 PM | Unknown | Unknown | Louisiana: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2017-11-09 | 8:45 AM | 11/09/2017 | 2:00 PM | Colorado: Weld County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | System Operations | 0 | 0 | Cyber Attack |
| November | 2017-11-13 | 4:33 PM | 11/16/2017 | 6:00 AM | Washington: King County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 85 | 68430 | Weather |
| November | 2017-11-13 | 2:00 AM | 11/15/2017 | 8:17 AM | Washington: Island County, King County, Kitsap County, Thurston County, Skagit County, Whatcom County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 236100 | Weather |
| November | 2017-11-16 | 3:05 PM | 11/16/2017 | 3:06 PM | Oregon: Tillamook County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| November | 2017-11-24 | 5:06 PM | 11/26/2017 | 5:22 PM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2017-12-04 | 9:53 PM | Unknown | Unknown | California: | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Severe Weather/Transmission Interruption | 540 | 263000 | Weather |
| December | 2017-12-05 | 6:50 AM | 12/05/2017 | 9:00 AM | Louisiana: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2017-12-05 | 6:30 AM | 12/06/2017 | 10:00 AM | Michigan: Oscoda County, Isabella County, Roscommon County, Ogemaw County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 117500 | Weather |
| December | 2017-12-07 | 8:00 PM | 12/08/2017 | 5:00 PM | Texas: Bexar County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 88000 | Weather |
| December | 2017-12-08 | 9:30 AM | 12/08/2017 | 10:30 PM | Louisiana: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 79000 | Weather |
| December | 2017-12-08 | 10:00 AM | 12/10/2017 | 8:50 PM | Alabama: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 865 | 301872 | Weather |
| December | 2017-12-10 | 1:25 AM | 12/10/2017 | 2:30 AM | California: Ventura County, Santa Barbara County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | 110 | 51323 | Weather |
| December | 2017-12-12 | 2:22 AM | 12/12/2017 | 2:25 AM | New York: Saratoga County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 3 | 1,208 | Physical Attack |
| December | 2017-12-13 | 9:55 AM | 12/13/2017 | 2:45 PM | New York: Suffolk County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| December | 2017-12-13 | 8:50 AM | Unknown | Unknown | Connecticut: New Haven County[13]; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2017-12-18 | 1:00 PM | 12/18/2017 | 5:00 PM | Mississippi: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2017-12-19 | 8:40 AM | 12/19/2017 | 10:36 AM | Florida: Alachua County; | FRCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| December | 2017-12-29 | 7:00 AM | Unknown | Unknown | New York: Tompkins County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 210 | Unknown | Fuel Supply Deficiency |
| December | 2017-12-29 | 6:15 AM | 12/29/2017 | 11:44 AM | Texas: Calhoun County; | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | Unknown | Unknown | Physical Attack |
| December | 2017-12-31 | 11:54 PM | 01/01/2018 | 2:14 PM | Colorado: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| January | 2018-01-01 | 9:37 PM | 01/02/2018 | 10:30 AM | Tennessee: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | Unknown | Unknown | Public Appeal |
| January | 2018-01-01 | 5:43 PM | Unknown | Unknown | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | Unknown | Unknown | Weather |
| January | 2018-01-01 | 6:21 PM | 01/02/2018 | 6:11 PM | Tennessee: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | Unknown | Unknown | Weather |
| January | 2018-01-02 | 10:00 AM | 02/12/2018 | 8:00 AM | New York: Niagara County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 675 | Unknown | Fuel Supply Deficiency |
| January | 2018-01-02 | 7:30 AM | Unknown | Unknown | South Carolina: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | 0 | 717000 | Weather |
| January | 2018-01-02 | 6:45 AM | 01/02/2018 | 9:00 AM | North Carolina: South Carolina: | SERC | System-wide voltage reductions of 3 percent or more | Severe Weather | 14998 | Unknown | Weather |
| January | 2018-01-04 | 1:49 AM | 01/04/2018 | 2:09 AM | Texas: Midland County; | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | Unknown | 500 | Physical Attack |
| January | 2018-01-12 | 1:08 PM | 01/12/2018 | 2:53 PM | Michigan: Midland County, Genesee County; | RF | Cyber event that causes interruptions of electrical system operations | System Operations | 41 | 23007 | Cyber Attack |
| January | 2018-01-15 | 4:20 AM | 01/18/2018 | 5:48 AM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | Unknown | Unknown | Weather |
| January | 2018-01-16 | 3:00 PM | 01/18/2018 | 1:00 PM | Tennessee: Shelby County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | Unknown | Unknown | Public Appeal |
| January | 2018-01-16 | 1:57 PM | 01/16/2018 | 2:32 PM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | Unknown | Unknown | Weather |
| January | 2018-01-16 | 3:00 PM | 01/18/2018 | 1:00 PM | Tennessee: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | Unknown | Unknown | Weather |
| January | 2018-01-17 | 5:10 AM | 01/17/2018 | 1:00 PM | Mississippi: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | 1788 | 420000 | Public Appeal |
| January | 2018-01-17 | 6:10 AM | 01/17/2018 | 2:00 PM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | Unknown | Unknown | Public Appeal |
| January | 2018-01-18 | 5:00 AM | 01/18/2018 | 9:45 AM | Mississippi: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | 1760 | 420000 | Public Appeal |
| January | 2018-01-18 | 6:00 AM | Unknown | Unknown | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | System Operations | Unknown | Unknown | Public Appeal |
| January | 2018-01-18 | 5:00 AM | 01/18/2018 | 11:00 AM | Arkansas: Mississippi: Louisiana: Texas: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | 31500 | Unknown | Weather |
| January | 2018-01-25 | 8:19 PM | 01/26/2018 | 2:00 AM | Pennsylvania: Montgomery County; | RF | Cyber event that could potentially impact electric power system adequacy or reliability | Suspicious Activity | Unknown | Unknown | Cyber Attack |
| February | 2018-02-04 | 1:42 PM | 02/04/2018 | 3:25 PM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 9760 | 0 | Physical Attack |
| February | 2018-02-08 | 1:25 PM | 02/08/2018 | 1:31 PM | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 30 | 10900 | Islanding |
| February | 2018-02-17 | 4:33 PM | 02/18/2018 | 12:00 AM | Oregon: Washington: California: | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Vandalism | 2330 | 0 | Physical Attack |
| February | 2018-02-17 | 5:56 PM | 02/18/2018 | 4:11 AM | Oregon: Washington: California: | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Vandalism | 2327 | 0 | Physical Attack |
| February | 2018-02-28 | 12:08 PM | 03/01/2018 | 3:45 PM | Florida: | FRCC | Cyber event that could potentially impact electric power system adequacy or reliability | System Operations | 0 | 0 | Cyber Attack |
| February | 2018-02-28 | 12:08 PM | 03/01/2018 | 3:45 PM | Florida: | FRCC | Cyber event that could potentially impact electric power system adequacy or reliability | System Operations | 0 | 0 | Cyber Attack |
| March | 2018-03-01 | 11:43 AM | 03/01/2018 | 11:56 AM | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 38 | 10898 | Weather |
| March | 2018-03-01 | 9:57 PM | 03/02/2018 | 10:14 AM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 86501 | Weather |
| March | 2018-03-01 | 10:20 PM | 03/04/2018 | 8:00 PM | Michigan: Wayne County, Washtenaw County, Oakland County, Macomb County, Monroe County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 95000 | Weather |
| March | 2018-03-02 | 11:17 PM | 03/03/2018 | 12:51 AM | Washington: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| March | 2018-03-02 | 11:34 AM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50000 | Weather |
| March | 2018-03-02 | 5:00 PM | 03/06/2018 | 11:00 AM | Delaware: Maryland: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 60000 | Weather |
| March | 2018-03-02 | 8:42 AM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 63331 | Weather |
| March | 2018-03-02 | 8:00 AM | 03/03/2018 | 11:00 PM | Virginia: West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 65198 | Weather |
| March | 2018-03-02 | 3:46 PM | 03/04/2018 | 7:46 PM | New York: New York County, Westchester County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 72353 | Weather |
| March | 2018-03-02 | 7:00 AM | Unknown | Unknown | New York: Dutchess County, Orange County, Greene County, Ulster County, Putnam County, Sullivan County, Albany County, Columbia County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 90000 | Weather |
| March | 2018-03-02 | 11:58 AM | Unknown | Unknown | Pennsylvania: Berks County, Bucks County, Carbon County, Chester County, Clinton County, Columbia County, Cumberland County, Dauphin County, Juniata County, Lackawanna County, Lancaster County, Lebanon County, Lehigh County, Luzerne County, Lycoming County, Monroe County, Montgomery County, Montour County, Northampton County, Northumberland County, Pike County, Schuylkill County, Snyder County; | RF | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | Unknown | 126000 | Weather |
| March | 2018-03-02 | 1:51 PM | 03/04/2018 | 12:11 PM | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 233136 | Weather |
| March | 2018-03-02 | 3:10 PM | 03/06/2018 | 4:57 AM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 249322 | Weather |
| March | 2018-03-02 | 1:51 PM | 03/05/2018 | 1:18 PM | Connecticut: Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 325000 | Weather |
| March | 2018-03-02 | 12:00 PM | Unknown | Unknown | Maryland: | RF | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system | Severe Weather | 670 | 474019 | Weather |
| March | 2018-03-02 | 12:00 PM | 03/05/2018 | 12:00 AM | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 630000 | Weather |
| March | 2018-03-07 | 5:15 PM | Unknown | Unknown | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 50 | 58000 | Weather |
| March | 2018-03-07 | 7:37 PM | 03/10/2018 | 4:35 PM | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 102000 | Weather |
| March | 2018-03-07 | 12:00 PM | 03/07/2018 | 5:00 PM | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 120000 | Weather |
| March | 2018-03-07 | 4:10 PM | 03/10/2018 | 11:32 AM | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 216800 | Weather |
| March | 2018-03-12 | 12:00 AM | 04/06/2018 | 11:00 AM | New York: Dutchess County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| March | 2018-03-13 | 12:10 AM | 03/13/2018 | 12:34 AM | Colorado: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2018-03-13 | 8:50 AM | 03/14/2018 | 11:22 PM | Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 123629 | Weather |
| March | 2018-03-19 | 11:29 PM | 03/20/2018 | 3:37 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 261 | 78220 | Weather |
| March | 2018-03-20 | 7:00 PM | 03/25/2018 | 6:30 AM | New Jersey: Atlantic County, Camden County, Cape May County, Gloucester County, Salem County, Cumberland County, Burlington County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 80 | 124000 | Weather |
| March | 2018-03-24 | 10:30 PM | 03/26/2018 | 8:00 PM | Virginia: West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 81227 | Weather |
| March | 2018-03-26 | 3:05 AM | 03/26/2018 | 3:35 AM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| March | 2018-03-28 | 3:00 PM | 03/28/2018 | 4:00 PM | Washington: Walla Walla County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 12 | 1,185 | Physical Attack |
| April | 2018-04-03 | 11:15 AM | 04/03/2018 | 11:30 AM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2018-04-04 | 4:42 PM | 04/07/2018 | 6:22 AM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 72896 | Weather |
| April | 2018-04-05 | 12:50 AM | 04/05/2018 | 4:00 PM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 65932 | Weather |
| April | 2018-04-09 | 10:07 AM | 04/09/2018 | 4:00 PM | Washington: Walla Walla County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2018-04-09 | 11:10 PM | 04/10/2018 | 6:47 AM | Florida: Palm Beach County; | FRCC | Physical attack that causes major interruptions or impacts to critical infrastructure facilities or to operations | Sabotage | 55 | 27,000 | Physical Attack |
| April | 2018-04-09 | 12:16 PM | 04/09/2018 | 1:52 PM | Utah: Salt Lake County; | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Transmission Interruption | 806 | 57000 | Transmission Interruption |
| April | 2018-04-09 | 11:16 AM | Unknown | Unknown | Utah: | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident | Transmission Interruption | 300 | 250000 | Transmission Interruption |
| April | 2018-04-14 | 9:30 AM | 04/14/2018 | 10:00 AM | Louisiana: Arkansas: Mississippi: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 56350 | Weather |
| April | 2018-04-15 | 5:14 PM | 04/15/2018 | 11:25 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 78100 | Weather |
| April | 2018-04-15 | 7:30 AM | 04/18/2018 | 7:30 AM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 389591 | Weather |
| May | 2018-05-02 | 2:52 PM | 05/02/2018 | 4:14 PM | North Carolina: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2018-05-04 | 11:10 PM | 05/05/2018 | 12:40 AM | New Hampshire: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 56000 | Weather |
| May | 2018-05-04 | 2:00 PM | 05/05/2018 | 9:30 AM | Michigan: Calhoun County, Genesee County, Ingham County, Kent County, Macomb County, Midland County, Saginaw County, Gratiot County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 90000 | Weather |
| May | 2018-05-04 | 8:10 PM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 106150 | Weather |
| May | 2018-05-04 | 12:00 PM | 05/06/2018 | 1:00 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 300000 | Weather |
| May | 2018-05-05 | 4:30 AM | 05/05/2018 | 3:30 PM | Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 31900 | Weather |
| May | 2018-05-07 | 10:30 AM | 05/07/2018 | 10:36 AM | New York: Tompkins County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspected Physical Attack | 0 | 0 | Physical Attack |
| May | 2018-05-08 | 4:00 PM | 05/08/2018 | 4:01 PM | Utah: Washington County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| May | 2018-05-14 | 7:08 PM | Unknown | Unknown | Virginia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 112000 | Weather |
| May | 2018-05-15 | 3:00 PM | 05/18/2018 | 1:48 PM | Massachusetts: | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2018-05-15 | 5:15 PM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 49999 | Weather |
| May | 2018-05-15 | 6:14 PM | 05/15/2018 | 7:00 PM | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 52872 | Weather |
| May | 2018-05-15 | 4:00 PM | Unknown | Unknown | New York: Dutchess County, Ulster County, Orange County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 72000 | Weather |
| May | 2018-05-15 | 5:25 PM | Unknown | Unknown | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 82372 | Weather |
| May | 2018-05-15 | 2:50 PM | Unknown | Unknown | Pennsylvania: Lehigh County, Schuylkill County, Cumberland County, Lancaster County, Northampton County, Berks County, Clinton County, Susquehanna County, Bucks County, Carbon County, Chester County, Columbia County, Juniata County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 114000 | Weather |
| May | 2018-05-15 | 6:35 PM | 05/18/2018 | 3:57 PM | Connecticut: Massachusetts: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 120000 | Weather |
| May | 2018-05-17 | 1:11 AM | 05/18/2018 | 12:38 AM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Transmission Disruption | 124 | 70000 | Transmission Interruption |
| May | 2018-05-17 | 1:11 AM | Unknown | Unknown | California: Contra Costa County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 70 | 70000 | Weather |
| May | 2018-05-26 | 6:40 PM | 05/27/2018 | 11:50 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 163932 | Weather |
| June | 2018-06-02 | 5:00 AM | 06/02/2018 | 11:00 AM | Missouri: Jackson County, Clay County, Platte County, Andrew County; Kansas: Johnson County; | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 103535 | Weather |
| June | 2018-06-04 | 8:50 AM | 06/04/2018 | 2:00 PM | Florida: Alachua County; | FRCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| June | 2018-06-09 | 9:54 AM | 06/09/2018 | 12:12 PM | Georgia: | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more | System Operations | 0 | 0 | Operations |
| June | 2018-06-10 | 2:25 PM | 06/11/2018 | 5:58 AM | Kentucky: | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more | System Operations | Unknown | Unknown | Operations |
| June | 2018-06-12 | 3:00 PM | 06/12/2018 | 3:15 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2018-06-12 | 4:15 PM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2018-06-18 | 6:20 PM | 06/19/2018 | 12:15 AM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 112927 | Weather |
| June | 2018-06-20 | 10:58 PM | 06/21/2018 | 6:05 AM | Florida: Palm Beach County; | FRCC | Complete operational failure or shut-down of the transmission and/or distribution of electrical system | Transmission Interruption | 73 | 27000 | Transmission Interruption |
| June | 2018-06-22 | 2:38 PM | Unknown | Unknown | Washington: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system | Severe Weather | 10000 | 4200000 | Weather |
| June | 2018-06-27 | 2:30 PM | 06/27/2018 | 2:33 PM | New York: New York County; | NPCC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2018-06-28 | 2:50 PM | 06/29/2018 | 9:00 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 160 | 48109 | Weather |
| June | 2018-06-28 | 6:36 PM | 07/01/2018 | 7:00 AM | Missouri: Illinois: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 112000 | Weather |
| June | 2018-06-29 | 3:38 AM | Unknown | Unknown | Kentucky: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more | System Operations | Unknown | Unknown | Operations |
| June | 2018-06-29 | 7:35 AM | 06/29/2018 | 9:30 AM | Minnesota: St. Louis County; | MRO | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Severe Weather | 350 | Unknown | Weather |
| June | 2018-06-30 | 10:45 AM | 06/30/2018 | 11:28 AM | Texas: Travis County, Williamson County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more | System Operations | 0 | 0 | Operations |
| June | 2018-06-30 | 12:30 PM | 06/30/2018 | 12:31 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2018-07-04 | 5:54 PM | 07/04/2018 | 7:20 PM | Tennessee: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2018-07-04 | 10:00 PM | 07/04/2018 | 10:30 PM | Colorado: Pueblo County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 5,058 | Physical Attack |
| July | 2018-07-09 | 1:10 PM | 07/09/2018 | 2:45 PM | California: Merced County, Kern County; Nevada: Clark County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2018-07-11 | 12:58 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2018-07-11 | 3:40 PM | 07/11/2018 | 4:00 PM | Tennessee: | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Transmission Interruption | 425 | 26195 | Transmission Interruption |
| July | 2018-07-14 | 10:20 AM | Unknown | Unknown | Ohio: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| July | 2018-07-16 | 5:15 AM | Unknown | Unknown | California: Merced County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2018-07-18 | 4:00 AM | Unknown | Unknown | California: Fresno County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2018-07-18 | 5:28 PM | 07/18/2018 | 5:31 PM | Oregon: | WECC | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | Severe Weather/Transmission Interruption | Unknown | Unknown | Weather |
| July | 2018-07-19 | 12:38 PM | 07/19/2018 | 1:22 PM | Louisiana: Rapides Parish; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2018-07-19 | 8:25 PM | Unknown | Unknown | Kentucky: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| July | 2018-07-20 | 12:46 PM | 07/20/2018 | 1:30 PM | Maine: Hancock County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | System Operations | 0 | 0 | Physical Attack |
| July | 2018-07-20 | 4:19 PM | 07/20/2018 | 4:48 PM | Kentucky: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 87833 | Weather |
| July | 2018-07-21 | 7:20 AM | 07/21/2018 | 11:30 AM | Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 143 | 42901 | Weather |
| July | 2018-07-21 | 4:45 AM | 07/21/2018 | 11:15 AM | Arkansas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 64930 | Weather |
| July | 2018-07-23 | 4:16 AM | 07/23/2018 | 4:29 AM | Florida: Pinellas County; | FRCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 40 | Unknown | Weather |
| July | 2018-07-26 | 8:24 PM | Unknown | Unknown | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Natural Disaster | Unknown | Unknown | Natural Disaster |
| July | 2018-07-27 | 9:34 AM | 07/27/2018 | 9:51 AM | Washington: Clark County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system | System Operations | Unknown | Unknown | Islanding |
| July | 2018-07-27 | 4:28 PM | 07/27/2018 | 4:33 PM | New York: New York County; | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| July | 2018-07-28 | 11:11 PM | 07/29/2018 | 1:51 AM | Nevada: Nye County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2018-07-29 | 2:33 PM | 07/29/2018 | 6:23 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Natural Disaster | 83 | 57670 | Natural Disaster |
| July | 2018-07-30 | 6:30 AM | 07/30/2018 | 11:00 PM | Arizona: Maricopa County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 82000 | Weather |
| July | 2018-07-31 | 11:44 AM | 07/31/2018 | 2:17 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| August | 2018-08-01 | 9:11 AM | 08/01/2018 | 10:56 AM | Montana: | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure or to operations. | Vandalism | 0 | 0 | Physical Attack |
| August | 2018-08-04 | 8:20 AM | 08/04/2018 | 8:21 AM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| August | 2018-08-07 | 1:22 AM | 08/07/2018 | 1:59 AM | California: Butte County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Natural Disaster | 5 | 485 | Natural Disaster |
| August | 2018-08-07 | 1:22 AM | 08/07/2018 | 7:04 PM | California: Butte County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Natural Disaster | 27 | 11383 | Natural Disaster |
| August | 2018-08-14 | 9:00 PM | 08/14/2018 | 9:01 PM | Virginia: Hanover County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2018-08-15 | 12:00 AM | 08/15/2018 | 1:00 AM | Missouri: Boone County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2018-08-17 | 1:07 PM | 08/17/2018 | 1:40 PM | California: | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2018-08-19 | 3:20 PM | 08/19/2018 | 3:21 PM | Utah: Box Elder County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2018-08-20 | 10:46 PM | 08/21/2018 | 12:14 AM | Louisiana: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2018-08-24 | 12:24 PM | 08/24/2018 | 12:59 PM | Virginia: Roanoke County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2018-08-26 | 10:00 PM | 08/27/2018 | 4:56 AM | Michigan: Muskegon County, Newaygo County, Oceana County, Mason County, Kent County, Mecosta County, Montcalm County, Isabella County, Midland County, Saginaw County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 67000 | Weather |
| August | 2018-08-28 | 11:41 PM | 08/29/2018 | 12:13 AM | Ohio: Montgomery County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2018-08-28 | 8:00 PM | 08/30/2018 | 2:59 PM | Michigan: Benzie County, Barry County, Grand Traverse County, Kalkaska County, Mason County, Oceana County, Muskegon County, Kent County, Newaygo County, Montcalm County, Mecosta County, Antrim County, Eaton County, Ionia County, Isabella County, Clare County, Saginaw County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 110000 | Weather |
| August | 2018-08-29 | 3:27 AM | 08/29/2018 | 4:00 AM | Maryland: Montgomery County; District of Columbia: | RF | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. OR suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2018-08-29 | 9:00 AM | 08/29/2018 | 9:06 AM | Arkansas: | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2018-08-29 | 12:00 AM | 08/30/2018 | 12:00 AM | Illinois: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 100000 | Weather |
| August | 2018-08-30 | 12:00 PM | 08/30/2018 | 12:20 PM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| August | 2018-08-31 | 3:07 PM | 08/31/2018 | 3:31 PM | Oregon: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Natural Disaster/Transmission Interruption | 96 | 50000 | Natural Disaster |
| August | 2018-08-31 | 6:34 PM | 08/31/2018 | 6:40 PM | New York: New York County, Westchester County; | NPCC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. OR suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2018-09-01 | 12:00 AM | 09/01/2018 | 3:22 PM | Arkansas: | SPP RE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2018-09-05 | 1:00 PM | 09/05/2018 | 1:01 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| September | 2018-09-06 | 2:26 AM | 09/06/2018 | 2:27 AM | Florida: Hillsborough County; | FRCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2018-09-12 | 10:00 PM | 09/12/2018 | 10:05 PM | Texas: | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2018-09-13 | 8:30 PM | 09/19/2018 | 5:00 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 300 | 325000 | Weather |
| September | 2018-09-13 | 8:56 PM | 09/20/2018 | 7:00 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 1457583 | Weather |
| September | 2018-09-15 | 3:00 PM | 09/15/2018 | 6:00 PM | Mississippi: Forrest County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | 1322 | 420000 | Public Appeal |
| September | 2018-09-15 | 3:00 PM | 09/15/2018 | 6:00 PM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Public Appeal |
| September | 2018-09-15 | 1:05 AM | 09/17/2018 | 4:00 PM | South Carolina: Horry County, Chesterfield County, Dillon County, Georgetown County, Marlboro County, Darlington County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 50100 | Weather |
| September | 2018-09-16 | 8:00 AM | 09/18/2018 | 7:40 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 50000 | Weather |
| September | 2018-09-19 | 11:00 AM | 09/20/2018 | 12:00 PM | Indiana: Benton County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2018-09-20 | 12:39 PM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2018-09-22 | 3:23 PM | 09/22/2018 | 11:00 PM | California: Los Angeles County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Natural Disaster | 3507 | 2500 | Natural Disaster |
| September | 2018-09-25 | 12:33 AM | 09/25/2018 | 3:10 AM | Illinois: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2018-09-26 | 1:54 PM | 09/26/2018 | 5:58 PM | Texas: Harris County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2018-09-28 | 6:58 PM | 09/28/2018 | 7:29 PM | Ohio: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-01 | 12:44 PM | 10/01/2018 | 5:32 PM | Ohio: Indiana: Michigan: Kentucky: West Virginia: Virginia: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| October | 2018-10-03 | 7:38 AM | 10/03/2018 | 7:48 AM | Illinois: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-04 | 4:01 PM | 10/04/2018 | 6:25 PM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2018-10-04 | 6:00 AM | 10/04/2018 | 8:00 AM | Oklahoma: Osage County; | SPP RE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 4 | 2,089 | Physical Attack |
| October | 2018-10-09 | 8:12 PM | 10/09/2018 | 9:12 PM | Colorado: El Paso County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more; Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-10 | 5:41 AM | 10/10/2018 | 7:54 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-10 | 5:00 PM | 10/15/2018 | 5:00 AM | Utah: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2018-10-10 | 11:59 AM | Unknown | Unknown | Florida: Alabama: Georgia: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 152 | 45604 | Weather |
| October | 2018-10-10 | 4:00 PM | 10/19/2018 | 6:00 AM | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 330 | 55000 | Weather |
| October | 2018-10-10 | 2:00 PM | 10/11/2018 | 6:00 AM | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 135 | 60717 | Weather |
| October | 2018-10-11 | 7:21 AM | 10/11/2018 | 3:00 PM | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 71654 | Weather |
| October | 2018-10-11 | 6:55 PM | 10/12/2018 | 12:00 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 117000 | Weather |
| October | 2018-10-11 | 4:42 PM | 10/12/2018 | 9:00 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 170222 | Weather |
| October | 2018-10-11 | 1:15 PM | Unknown | Unknown | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 240807 | Weather |
| October | 2018-10-12 | 3:36 AM | 10/12/2018 | 1:56 PM | Maryland: Garrett County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2018-10-14 | 10:11 PM | Unknown | Unknown | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Natural Disaster | Unknown | 60000 | Natural Disaster |
| October | 2018-10-16 | 4:15 AM | 10/16/2018 | 5:11 PM | Connecticut: Rhode Island: Massachusetts: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 18000 | Weather |
| October | 2018-10-21 | 12:16 AM | 10/21/2018 | 4:14 PM | West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 63408 | Weather |
| October | 2018-10-22 | 10:25 AM | 10/22/2018 | 10:31 AM | Utah: Salt Lake County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2018-10-24 | 12:32 PM | 10/24/2018 | 1:33 PM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-29 | 5:00 AM | 11/07/2018 | 7:00 AM | California: Shasta County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2018-10-29 | 8:39 AM | Unknown | Unknown | Minnesota: Douglas County; | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2018-10-30 | 2:02 PM | 10/30/2018 | 2:42 PM | Maryland: Baltimore, City of; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2018-10-31 | 7:30 PM | 11/01/2018 | 6:55 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 402 | 140932 | Weather |
| November | 2018-11-02 | 9:50 AM | Unknown | Unknown | Minnesota: Douglas County; | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| November | 2018-11-03 | 5:53 AM | 11/03/2018 | 5:57 AM | Illinois: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2018-11-03 | 5:20 PM | 11/04/2018 | 2:30 PM | Connecticut: Massachusetts: New Hampshire: Vermont: Maine: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 62000 | Weather |
| November | 2018-11-06 | 9:49 AM | 11/09/2018 | 2:05 PM | Tennessee: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 61000 | Weather |
| November | 2018-11-08 | 7:16 AM | 11/28/2018 | 4:32 PM | California: Butte County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system | Natural Disaster/Transmission Interruption | 32 | 11844 | Natural Disaster |
| November | 2018-11-08 | 4:00 PM | Unknown | Unknown | Nevada: Carson City, Consolidated Municipality of[19]; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2018-11-09 | 9:02 AM | 11/09/2018 | 10:23 AM | Iowa: Muscatine County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2018-11-10 | 5:02 PM | 11/14/2018 | 3:00 PM | Wisconsin: | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| November | 2018-11-13 | 6:19 PM | 11/13/2018 | 7:40 PM | Arkansas: Oklahoma: Louisiana: Texas: | SPP RE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2018-11-15 | 10:50 AM | 11/17/2018 | 1:12 PM | Virginia: West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 50600 | Weather |
| November | 2018-11-15 | 5:28 AM | 11/15/2018 | 8:35 AM | Indiana: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55000 | Weather |
| November | 2018-11-15 | 5:38 AM | 11/16/2018 | 6:00 AM | Kentucky: Ohio: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 104000 | Weather |
| November | 2018-11-15 | 3:23 AM | 11/15/2018 | 5:35 PM | Kentucky: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 150000 | Weather |
| November | 2018-11-18 | 1:10 PM | Unknown | Unknown | Nebraska: Holt County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 2 | 0 | Physical Attack |
| November | 2018-11-25 | 10:30 PM | 11/28/2018 | 8:17 PM | Illinois: Will County, DuPage County, Kane County, McHenry County, Winnebago County, Ogle County, DeKalb County, Lee County, Grundy County, Lake County, Cook County, Livingston County, Stephenson County, LaSalle County, Kankakee County, Kendall County, Boone County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 313448 | Weather |
| November | 2018-11-27 | 8:00 AM | 11/28/2018 | 4:50 PM | Maine: New Hampshire: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 32000 | Weather |
| December | 2018-12-01 | 4:23 PM | 12/01/2018 | 5:09 PM | Florida: Leon County; | FRCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2018-12-01 | 9:40 AM | 12/04/2018 | 5:17 PM | Pennsylvania: | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-02 | 4:17 PM | 12/02/2018 | 8:30 PM | Maryland: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2018-12-03 | 3:15 AM | 12/03/2018 | 3:44 AM | Texas: | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 16 | Unknown | Transmission Interruption |
| December | 2018-12-05 | 8:00 AM | 12/06/2018 | 8:00 AM | Alabama: Chambers County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-05 | 12:48 PM | 12/05/2018 | 12:49 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-07 | 3:10 AM | 12/07/2018 | 4:35 AM | Utah: Weber County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Actual Physical Attack | 0 | 0 | Physical Attack |
| December | 2018-12-09 | 11:28 PM | 12/10/2018 | 1:30 AM | Virginia: Loudoun County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-09 | 12:23 AM | 12/09/2018 | 11:54 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 137 | 41126 | Weather |
| December | 2018-12-09 | 3:35 AM | 12/10/2018 | 11:45 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | Unknown | 50000 | Weather |
| December | 2018-12-09 | 8:41 AM | 12/09/2018 | 6:00 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 70000 | Weather |
| December | 2018-12-11 | 9:10 AM | 12/11/2018 | 10:26 AM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2018-12-11 | 7:00 AM | 12/13/2018 | 2:00 PM | Oregon: Josephine County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-12 | 10:00 AM | 12/12/2018 | 10:31 AM | Oregon: Gilliam County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-13 | 10:00 AM | Unknown | Unknown | California: Stanislaus County, San Joaquin County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2018-12-14 | 8:40 AM | 12/14/2018 | 10:00 AM | Texas: Jasper County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2018-12-14 | 6:00 PM | Unknown | Unknown | Washington: Snohomish County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 200 | 60000 | Weather |
| December | 2018-12-14 | 4:00 PM | 12/17/2018 | 2:00 AM | Washington: King County, Kitsap County, Island County, Pierce County, Thurston County, Whatcom County, Skagit County, Kittitas County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 150000 | Weather |
| December | 2018-12-18 | 8:47 AM | 12/18/2018 | 8:48 AM | Utah: Salt Lake County; California: Oregon: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-20 | 9:30 AM | 12/20/2018 | 5:00 PM | Washington: Skagit County, Snohomish County, King County, Kitsap County, Island County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 165000 | Weather |
| December | 2018-12-26 | 1:00 AM | 01/03/2019 | 10:27 AM | California: Kern County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-27 | 12:05 AM | 12/27/2018 | 1:05 AM | Maryland: Montgomery County, Prince George's County; District of Columbia: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2018-12-27 | 12:50 PM | 12/27/2018 | 1:00 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2018-12-27 | 9:12 PM | 12/27/2018 | 9:16 PM | New York: New York County; | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| December | 2018-12-30 | 11:41 AM | 12/30/2018 | 1:20 PM | Washington: King County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-05 | 1:19 PM | 01/05/2019 | 3:07 PM | Washington: | WECC | Complete loss of Interpersonal Communication and Alternative Interpersonal Communication capability affecting its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | Unknown | Operations |
| January | 2019-01-06 | 5:56 PM | 01/06/2019 | 9:52 PM | California: Sacramento County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 300 | 90382 | Weather |
| January | 2019-01-06 | 1:00 AM | 01/06/2019 | 12:00 PM | Washington: King County, Thurston County, Pierce County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 230000 | Weather |
| January | 2019-01-06 | 3:00 AM | 01/09/2019 | 7:00 AM | Washington: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 230 | 230000 | Weather |
| January | 2019-01-07 | 8:57 PM | 01/07/2019 | 9:32 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-09 | 11:55 AM | 01/09/2019 | 11:56 AM | New Mexico: San Juan County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2019-01-10 | 12:19 PM | 01/10/2019 | 12:48 PM | Montana: Valley County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 11 | 2 | Operations |
| January | 2019-01-11 | 11:36 AM | 01/11/2019 | 12:43 PM | Maine: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-12 | 7:20 PM | 01/12/2019 | 9:38 PM | New Hampshire: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-12 | 11:30 AM | 01/13/2019 | 10:00 PM | Missouri: Jackson County; Kansas: Johnson County; | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 112530 | Weather |
| January | 2019-01-12 | 11:30 AM | Unknown | Unknown | Missouri: Nebraska: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 116600 | Weather |
| January | 2019-01-13 | 5:30 AM | 01/15/2019 | 5:00 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 133200 | Unknown | Weather |
| January | 2019-01-14 | 11:10 AM | Unknown | Unknown | Michigan: | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Actual Physical Attack | Unknown | Unknown | Physical Attack |
| January | 2019-01-15 | 8:00 AM | 01/15/2019 | 8:02 AM | Pennsylvania: | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| January | 2019-01-16 | 5:19 AM | 01/16/2019 | 7:14 AM | Texas: Nueces County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-16 | 5:26 PM | 01/17/2019 | 12:19 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 190 | 126700 | Weather |
| January | 2019-01-18 | 9:54 PM | 01/19/2019 | 12:19 AM | Nebraska: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 8 | Unknown | Transmission Interruption |
| January | 2019-01-23 | 7:26 AM | 01/23/2019 | 5:05 PM | Colorado: Larimer County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| January | 2019-01-24 | 4:39 AM | 01/24/2019 | 5:16 AM | Ohio: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2019-01-28 | 1:35 PM | 01/28/2019 | 1:40 PM | Utah: Iron County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| January | 2019-01-29 | 6:34 PM | 01/29/2019 | 6:36 PM | Louisiana: Washington Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| January | 2019-01-30 | 4:23 AM | 02/02/2019 | 9:00 AM | Illinois: Scott County; | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| January | 2019-01-30 | 4:30 PM | Unknown | Unknown | Washington: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| January | 2019-01-30 | 7:00 AM | 01/30/2019 | 8:08 AM | Illinois: Pike County; | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Severe Weather | Unknown | Unknown | Weather |
| January | 2019-01-30 | 9:30 AM | 01/31/2019 | 6:00 PM | Michigan: | RF | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| January | 2019-01-31 | 9:33 PM | 01/31/2019 | 9:34 PM | California: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-01 | 5:35 AM | 02/01/2019 | 6:10 AM | Massachusetts | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2019-02-01 | 11:57 PM | 02/02/2019 | 8:49 AM | Nevada | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 1 | Physical Attack |
| February | 2019-02-02 | 10:28 AM | 02/02/2019 | 10:29 AM | California | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-05 | 6:17 PM | 02/05/2019 | 8:26 PM | California | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Severe Weather | 42 | 33200 | Weather |
| February | 2019-02-07 | 7:39 AM | 02/07/2019 | 7:40 AM | Arkansas | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 3 | 3370 | Weather |
| February | 2019-02-07 | 8:55 AM | 02/09/2019 | 4:30 PM | Michigan | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 233000 | Weather |
| February | 2019-02-08 | 10:00 AM | 02/08/2019 | 10:30 AM | Pennsylvania | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-08 | 6:30 PM | Unknown | Unknown | Washington | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 50940 | Weather |
| February | 2019-02-13 | 2:48 AM | 02/15/2019 | 12:28 AM | California | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 182 | 121000 | Weather |
| February | 2019-02-14 | 8:50 AM | 02/14/2019 | 12:10 PM | New Jersey | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-14 | 12:15 PM | 02/14/2019 | 12:16 PM | Utah | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-19 | 9:45 AM | Unknown | Unknown | Texas | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2019-02-20 | 12:50 PM | 02/20/2019 | 1:32 PM | Wisconsin, Minnesota, Iowa, Illinois | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 740 | 0 | Operations |
| February | 2019-02-23 | 2:05 PM | Unknown | Unknown | Virginia | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | Unknown | Unknown | Weather |
| February | 2019-02-24 | 2:33 PM | 02/24/2019 | 6:03 PM | Pennsylvania | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 94048 | Weather |
| February | 2019-02-24 | 8:02 PM | 02/25/2019 | 2:30 PM | Michigan | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 115000 | Weather |
| February | 2019-02-24 | 11:21 AM | 02/26/2019 | 5:29 PM | Ohio, Virginia, West Virginia | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 118781 | Weather |
| February | 2019-02-24 | 6:00 PM | 02/25/2019 | 10:00 PM | Pennsylvania | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 132000 | Weather |
| February | 2019-02-24 | 6:47 PM | 02/25/2019 | 1:55 PM | Pennsylvania | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 137216 | Weather |
| February | 2019-02-24 | 12:31 PM | 02/24/2019 | 2:57 PM | Ohio | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 157274 | Weather |
| February | 2019-02-25 | 7:45 AM | 02/25/2019 | 6:40 PM | Massachusetts | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2019-02-25 | 1:35 PM | 02/26/2019 | 2:50 AM | Connecticut, Massachusetts, New Hampshire, Maine, Vermont, Rhode Island | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 72332 | Weather |
| February | 2019-02-27 | 9:35 PM | 02/27/2019 | 9:45 PM | South Carolina | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2019-02-27 | 11:25 AM | 02/27/2019 | 5:39 PM | Iowa | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2019-02-28 | 7:02 AM | 02/28/2019 | 7:33 AM | Oklahoma, Arkansas, Louisiana | SPP RE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2019-03-04 | 11:39 AM | 03/08/2019 | 4:52 PM | Oklahoma: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2019-03-05 | 9:12 AM | 03/05/2019 | 6:57 PM | California: Kern County, Los Angeles County; Utah: Salt Lake County; Wyoming: Converse County; | WECC | Cyber event that causes interruptions of electrical system operations. | System Operations | 0 | 0 | Cyber Attack |
| March | 2019-03-13 | 6:12 AM | 03/13/2019 | 6:13 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2019-03-13 | 3:51 PM | 03/16/2019 | 6:00 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 50 | 54290 | Weather |
| March | 2019-03-13 | 11:29 AM | 03/14/2019 | 9:11 PM | Colorado: Jefferson County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 58 | 58379 | Weather |
| March | 2019-03-13 | 3:00 PM | 03/14/2019 | 12:00 AM | Texas: Kansas: Oklahoma: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | Unknown | 66000 | Weather |
| March | 2019-03-13 | 5:50 AM | 03/13/2019 | 10:30 AM | Texas: Midland County, Ector County, Tarrant County, Dallas County, Wichita County, Brown County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 154124 | Weather |
| March | 2019-03-19 | 10:53 PM | 03/19/2019 | 10:54 PM | Oklahoma: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2019-03-21 | 10:00 AM | 03/21/2019 | 10:05 AM | Utah: Salt Lake County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| March | 2019-03-25 | 7:47 AM | 03/25/2019 | 7:48 AM | Oregon: Lane County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Actual Physical Attack | 5 | Unknown | Physical Attack |
| March | 2019-03-29 | 11:36 PM | 03/30/2019 | 2:00 AM | California: San Diego County, Los Angeles County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2019-04-01 | 6:51 AM | 04/01/2019 | 7:53 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2019-04-01 | 6:51 AM | 04/01/2019 | 7:53 AM | New York: Monroe County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2019-04-01 | 2:15 PM | 04/06/2019 | 5:20 PM | Nevada: Carson City, Consolidated Municipality of[19], Washoe County, Churchill County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| April | 2019-04-02 | 8:33 AM | 04/02/2019 | 9:00 AM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-02 | 10:15 AM | 04/02/2019 | 10:16 AM | Utah: Salt Lake County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-03 | 5:15 AM | 04/03/2019 | 12:39 PM | California: Fresno County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| April | 2019-04-04 | 10:13 AM | 04/04/2019 | 12:08 PM | Montana: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2019-04-07 | 1:46 PM | 04/08/2019 | 5:50 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 537 | 231956 | Weather |
| April | 2019-04-10 | 11:59 AM | 04/10/2019 | 12:00 PM | Virginia: | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2019-04-11 | 7:48 PM | 04/11/2019 | 8:00 PM | Oregon: Washington: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2019-04-12 | 11:20 AM | 04/12/2019 | 12:46 PM | Minnesota: Martin County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2019-04-13 | 6:15 PM | 04/13/2019 | 11:15 PM | Mississippi: Arkansas: Texas: Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 60467 | Weather |
| April | 2019-04-15 | 10:00 AM | 04/15/2019 | 2:00 PM | Minnesota: | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-15 | 4:35 AM | 04/15/2019 | 2:40 PM | Virginia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 75290 | Weather |
| April | 2019-04-16 | 10:30 AM | 04/16/2019 | 11:00 AM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-17 | 7:38 PM | 04/17/2019 | 11:52 PM | Arizona: | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2019-04-18 | 8:08 PM | 04/19/2019 | 11:00 AM | Colorado: Clear Creek County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2019-04-18 | 7:55 PM | 04/19/2019 | 5:29 PM | Alabama: Mississippi: Georgia: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 116 | 34695 | Weather |
| April | 2019-04-21 | 10:40 AM | 04/21/2019 | 10:45 AM | Utah: Salt Lake County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-25 | 6:03 PM | 04/25/2019 | 6:32 PM | Arizona: Maricopa County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Generation Inadequacy | 150 | 51366 | Generation Interruption |
| April | 2019-04-26 | 1:00 AM | 04/26/2019 | 1:27 PM | Pennsylvania: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 7 | 5830 | Transmission Interruption |
| April | 2019-04-26 | 3:16 PM | 04/26/2019 | 3:17 PM | Massachusetts: Hampden County[13]; | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| April | 2019-04-26 | 5:46 PM | 04/27/2019 | 11:49 AM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 54071 | Weather |
| April | 2019-04-28 | 1:40 PM | 04/28/2019 | 2:49 PM | South Carolina: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2019-04-28 | 10:43 AM | 04/29/2019 | 2:06 AM | Ohio: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2019-04-29 | 5:17 PM | 04/30/2019 | 9:22 AM | Virginia: Surry County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2019-04-30 | 12:25 PM | 04/30/2019 | 1:11 PM | Indiana: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2019-05-08 | 9:22 AM | 05/08/2019 | 9:56 AM | Pennsylvania: Mercer County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 29 | 1 | Transmission Interruption |
| May | 2019-05-08 | 3:50 PM | 05/13/2019 | 12:00 AM | Louisiana: Texas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 65844 | Weather |
| May | 2019-05-09 | 7:06 PM | 05/10/2019 | 2:57 AM | Texas: Harris County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| May | 2019-05-09 | 5:55 PM | 05/11/2019 | 8:50 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 691 | 238015 | Weather |
| May | 2019-05-10 | 2:00 AM | 05/10/2019 | 12:15 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 61008 | Weather |
| May | 2019-05-11 | 2:08 PM | 05/11/2019 | 3:00 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2019-05-15 | 12:10 PM | 05/15/2019 | 12:11 PM | West Virginia: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| May | 2019-05-18 | 1:55 AM | 05/18/2019 | 3:06 PM | Colorado: Wyoming: Nebraska: Utah: Daggett County; New Mexico: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 30 | 0 | Physical Attack |
| May | 2019-05-18 | 3:45 PM | 05/20/2019 | 4:00 AM | Texas: Ector County, Midland County, Tarrant County, Dallas County, Stephens County, Anderson County, McLennan County, Ellis County, Hunt County, Young County, Bell County, Limestone County, Collin County, Rockwall County, Henderson County, Parker County, Falls County, Freestone County, Kaufman County, Grayson County, Smith County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 68000 | Weather |
| May | 2019-05-23 | 1:11 AM | 05/23/2019 | 12:00 PM | Indiana: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| May | 2019-05-23 | 4:55 PM | 05/23/2019 | 11:40 PM | Virginia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 100000 | Weather |
| May | 2019-05-24 | 7:28 AM | 05/24/2019 | 8:30 AM | Kentucky: Shelby County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2019-05-24 | 8:09 PM | 05/25/2019 | 2:23 PM | North Dakota: Minnesota: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2019-05-24 | 9:47 PM | 05/24/2019 | 11:58 PM | California: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system | Severe Weather | 20 | 10961 | Weather |
| May | 2019-05-27 | 10:07 PM | 05/28/2019 | 3:00 AM | Ohio: Montgomery County, Darke County, Mercer County, Miami County, Greene County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 347 | 70000 | Weather |
| June | 2019-06-02 | 6:19 PM | 06/02/2019 | 8:43 PM | California: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Severe Weather/Transmission Interruption | Unknown | Unknown | Weather |
| June | 2019-06-04 | 10:15 AM | 06/04/2019 | 1:15 PM | Nevada: Washoe County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2019-06-05 | 8:37 AM | 06/05/2019 | 8:40 AM | Idaho: Bannock County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-05 | 10:16 AM | 06/05/2019 | 10:17 AM | South Dakota: Lincoln County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-05 | 9:46 AM | 06/05/2019 | 12:00 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-06 | 6:09 PM | 06/06/2019 | 6:35 PM | Texas: Bexar County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55017 | Weather |
| June | 2019-06-07 | 2:43 PM | 06/07/2019 | 4:20 PM | Texas: Pecos County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 8 | 1 | Transmission Interruption |
| June | 2019-06-08 | 3:50 PM | 06/08/2019 | 7:40 PM | Texas: Potter County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| June | 2019-06-09 | 2:45 PM | 06/13/2019 | 10:30 PM | Texas: Collin County, Dallas County, Denton County, Palo Pinto County, Tarrant County, Ellis County, Williamson County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 558000 | Weather |
| June | 2019-06-11 | 3:11 PM | 06/11/2019 | 5:00 PM | North Dakota: Mountrail County, Williams County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-11 | 7:52 AM | 06/11/2019 | 7:53 AM | Utah: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-12 | 2:56 PM | 06/12/2019 | 3:50 PM | California: Imperial County, Riverside County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Generation Inadequacy | 982 | 30907 | Generation Interruption |
| June | 2019-06-16 | 2:00 AM | 06/17/2019 | 11:59 PM | Texas: Dallas County, Tarrant County, Collin County, Denton County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 340000 | Weather |
| June | 2019-06-16 | 3:25 AM | Unknown | Unknown | Oklahoma: | SPP RE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | Unknown | Unknown | Weather |
| June | 2019-06-18 | 6:21 AM | 06/18/2019 | 6:40 AM | Washington: Grant County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2019-06-19 | 3:00 PM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-19 | 11:00 AM | 06/19/2019 | 11:01 AM | Oklahoma: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-19 | 10:30 PM | 06/20/2019 | 7:00 PM | Arkansas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 82045 | Weather |
| June | 2019-06-20 | 4:11 PM | 06/21/2019 | 12:45 PM | Virginia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 60000 | Weather |
| June | 2019-06-21 | 6:36 PM | 06/21/2019 | 7:27 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2019-06-21 | 10:00 AM | 06/21/2019 | 11:00 AM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2019-06-21 | 7:15 PM | Unknown | Unknown | Kentucky: Tennessee: | SERC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Severe Weather | Unknown | 50000 | Weather |
| June | 2019-06-22 | 8:46 PM | 06/23/2019 | 12:30 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 115 | 34637 | Weather |
| June | 2019-06-23 | 5:13 AM | 06/23/2019 | 10:58 AM | Arkansas: | SPP RE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 47 | 16199 | Transmission Interruption |
| June | 2019-06-23 | 10:00 PM | 06/25/2019 | 11:00 PM | Texas: Dallas County, Denton County, Ellis County, Collin County, Ellis County, Hood County, Johnson County, Kaufman County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 265000 | Weather |
| June | 2019-06-24 | 9:40 AM | 06/24/2019 | 3:17 PM | Oklahoma: Oklahoma County; | SPP RE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2019-06-24 | 5:30 AM | 06/24/2019 | 8:45 AM | Arkansas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 56451 | Weather |
| June | 2019-06-26 | 1:58 PM | 06/26/2019 | 2:03 PM | North Dakota: Williams County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 53 | 0 | Transmission Interruption |
| June | 2019-06-28 | 2:25 PM | Unknown | Unknown | Idaho: Nez Perce County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| June | 2019-06-30 | 3:15 PM | 06/30/2019 | 4:15 PM | New York: Nassau County, Suffolk County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 3189 | 52498 | Weather |
| June | 2019-06-30 | 3:30 PM | 06/30/2019 | 8:30 PM | Illinois: Cook County, DeKalb County, DuPage County, Grundy County, Iroquois County, Ford County, Lake County, Kendall County, Kankakee County, Kane County, Ogle County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 100000 | Weather |
| July | 2019-07-02 | 1:00 PM | 07/02/2019 | 1:22 PM | Idaho: Ada County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2019-07-06 | 10:00 PM | 07/07/2019 | 1:57 PM | Mississippi: Panola County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | Unknown | 3,000 | Physical Attack |
| July | 2019-07-09 | 1:59 AM | 07/09/2019 | 3:50 PM | Texas: Louisiana: Arkansas: Mississippi: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2019-07-10 | 12:00 PM | 07/10/2019 | 12:15 PM | Utah: Salt Lake County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2019-07-10 | 12:10 PM | 07/12/2019 | 12:30 PM | Texas: Collin County, Dallas County, Denton County, Hood County, Johnson County, Tarrant County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 57000 | Weather |
| July | 2019-07-11 | 11:08 AM | 07/11/2019 | 11:13 AM | Texas: Lynn County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 26 | 2043 | Transmission Interruption |
| July | 2019-07-13 | 6:47 PM | 07/13/2019 | 11:37 PM | New York: New York County; | NPCC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Transmission Interruption | 452 | 72669 | Transmission Interruption |
| July | 2019-07-13 | 7:15 AM | 07/14/2019 | 5:00 PM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55730 | Weather |
| July | 2019-07-13 | 11:55 PM | 07/14/2019 | 1:00 PM | Louisiana: Acadia Parish, Avoyelles Parish, Catahoula Parish, Evangeline Parish, Grant Parish, Iberia Parish, LaSalle Parish, Natchitoches Parish, Rapides Parish, Sabine Parish, St. Landry Parish, St. Martin Parish, St. Mary Parish, St. Tammany Parish, Allen Parish, Beauregard Parish, Calcasieu Parish, Vermilion Parish, De Soto Parish, Jefferson Davis Parish, Red River Parish, Tangipahoa Parish, Vernon Parish, Washington Parish; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 63000 | Weather |
| July | 2019-07-17 | 2:12 PM | 07/17/2019 | 2:30 PM | Oklahoma: Oklahoma County; | SPP RE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2019-07-19 | 9:55 AM | 07/19/2019 | 1:00 PM | Wisconsin: Dane County; | MRO | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| July | 2019-07-19 | 7:00 PM | 07/21/2019 | 8:00 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 400000 | Weather |
| July | 2019-07-20 | 7:37 AM | 07/20/2019 | 9:20 AM | Missouri: Boone County; | SERC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2019-07-20 | 11:55 AM | 07/23/2019 | 12:00 AM | Wisconsin: Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 200 | 50000 | Weather |
| July | 2019-07-20 | 3:00 AM | 07/22/2019 | 7:00 AM | Michigan: Kent County, Newaygo County, Mecosta County, Montcalm County, Isabella County, Ionia County, Allegan County, Barry County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 160000 | Weather |
| July | 2019-07-21 | 11:00 PM | 07/22/2019 | 8:54 PM | New York: Kings County, New York County, Queens County, Bronx County, Westchester County, Richmond County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 60 | 45000 | Weather |
| July | 2019-07-22 | 5:50 PM | 07/25/2019 | 1:15 PM | New Jersey: Gloucester County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 49 | 95600 | Weather |
| July | 2019-07-22 | 4:00 PM | 07/24/2019 | 11:00 PM | Pennsylvania: Bucks County, Delaware County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 165000 | Weather |
| July | 2019-07-23 | 3:22 AM | 07/23/2019 | 5:40 AM | California: Santa Cruz County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 25 | Physical Attack |
| July | 2019-07-23 | 11:55 PM | 07/23/2019 | 11:56 PM | Nebraska: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2019-07-23 | 11:55 PM | 07/24/2019 | 5:22 AM | Nebraska: Scotts Bluff County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2019-07-23 | 3:39 PM | 07/23/2019 | 7:00 PM | Massachusetts: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 54 | 54535 | Weather |
| July | 2019-07-24 | 8:01 AM | 07/24/2019 | 12:49 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2019-07-24 | 1:30 PM | 07/24/2019 | 1:31 PM | Utah: Iron County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 1 | Physical Attack |
| July | 2019-07-28 | 6:48 PM | 07/28/2019 | 7:18 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2019-07-30 | 8:45 AM | 07/30/2019 | 9:45 AM | Louisiana: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | Unknown | 13720 | Weather |
| August | 2019-08-02 | 6:24 PM | 08/02/2019 | 7:28 PM | Washington: Clark County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-02 | 1:49 AM | 08/02/2019 | 1:55 AM | Minnesota: Chisago County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| August | 2019-08-05 | 5:23 PM | 08/06/2019 | 12:02 AM | Oregon: Umatilla County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 66 | Unknown | Transmission Interruption |
| August | 2019-08-07 | 9:30 AM | 08/07/2019 | 11:15 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-07 | 3:00 PM | 08/07/2019 | 3:30 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2019-08-07 | 8:40 AM | Unknown | Unknown | Washington: Pierce County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| August | 2019-08-08 | 4:16 PM | 08/08/2019 | 10:41 PM | Ohio: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | Unknown | 5600 | Weather |
| August | 2019-08-09 | 9:53 AM | 08/09/2019 | 10:46 AM | Texas: Travis County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2019-08-10 | 4:11 PM | 08/10/2019 | 4:46 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-10 | 7:59 PM | 08/10/2019 | 9:04 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-13 | 10:00 AM | 08/13/2019 | 11:00 AM | California: Placer County; | WECC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident. | Vandalism | 0 | 0 | Physical Attack |
| August | 2019-08-13 | 12:00 AM | Unknown | Unknown | North Dakota: Mercer County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| August | 2019-08-13 | 3:10 PM | 08/13/2019 | 5:30 PM | Texas: Williamson County; | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2019-08-15 | 11:03 PM | 08/16/2019 | 12:37 AM | California: Marin County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Distribution Interruption | 80 | 61318 | Distribution Interruption |
| August | 2019-08-15 | 8:30 AM | Unknown | Unknown | New York: Tompkins County; | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 150 | Unknown | Fuel Supply Deficiency |
| August | 2019-08-15 | 3:07 AM | 08/15/2019 | 3:56 AM | District of Columbia: Maryland: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-15 | 11:00 AM | 08/15/2019 | 3:30 PM | Kentucky: Ohio County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2019-08-15 | 3:11 PM | 08/15/2019 | 6:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2019-08-18 | 4:47 PM | 08/18/2018 | 11:00 PM | Texas: | TRE | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Distribution Interruption | 752 | 86373 | Distribution Interruption |
| August | 2019-08-18 | 4:30 PM | 08/18/2019 | 10:00 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Transmission Interruption/Distribution Interruption | 259 | 61000 | Transmission Interruption |
| August | 2019-08-18 | 3:59 PM | 08/18/2019 | 11:00 PM | Louisiana: Texas: | SPP RE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Transmission Interruption | 271 | 86373 | Transmission Interruption |
| August | 2019-08-21 | 3:30 PM | Unknown | Unknown | Massachusetts: Middlesex County[13]; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| August | 2019-08-21 | 7:56 AM | Unknown | Unknown | Ohio: | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 1,397 | Physical Attack |
| August | 2019-08-24 | 4:10 PM | 08/24/2019 | 7:28 PM | Washington: | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | Suspicious Activity | 0 | 0 | Cyber Attack |
| August | 2019-08-25 | 1:44 AM | 08/25/2019 | 2:20 AM | Washington: King County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2019-08-26 | 9:09 AM | 08/26/2019 | 1:34 PM | North Dakota: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| August | 2019-08-26 | 7:00 PM | 08/27/2019 | 3:00 AM | Oklahoma: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | Unknown | 95000 | Weather |
| August | 2019-08-26 | 7:00 PM | 08/29/2019 | 1:00 PM | Oklahoma: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 103779 | Weather |
| August | 2019-08-29 | 11:30 PM | 08/30/2019 | 5:30 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-31 | 3:05 PM | 08/31/2019 | 3:46 PM | Pennsylvania: New Jersey: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2019-08-31 | 4:00 PM | 09/02/2019 | 6:00 AM | California: Calaveras County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2019-09-04 | 11:13 AM | 09/04/2019 | 11:57 AM | Maryland: District of Columbia: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-04 | 2:30 PM | 09/06/2019 | 6:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| September | 2019-09-05 | 10:08 AM | 09/05/2019 | 12:08 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-05 | 10:00 PM | 09/06/2019 | 12:00 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 3 | 2000 | Weather |
| September | 2019-09-05 | 10:36 PM | 09/06/2019 | 4:00 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 116000 | Weather |
| September | 2019-09-05 | 4:15 AM | 09/05/2019 | 3:17 PM | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 172278 | Weather |
| September | 2019-09-06 | 8:20 AM | Unknown | Unknown | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 77000 | Weather |
| September | 2019-09-10 | 9:22 PM | 09/10/2019 | 9:23 PM | Wyoming: Sweetwater County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 885 | 0 | Transmission Interruption |
| September | 2019-09-11 | 10:35 PM | 09/11/2019 | 11:59 PM | Michigan: Ionia County, Kent County, Barry County, Montcalm County, Allegan County, Ottawa County, Newaygo County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 54000 | Weather |
| September | 2019-09-13 | 2:31 AM | 09/16/2019 | 5:00 PM | Tennessee: | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-19 | 5:55 AM | 09/19/2019 | 2:30 PM | Arizona: Pima County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| September | 2019-09-19 | 6:40 PM | 09/19/2019 | 6:46 PM | Minnesota: Washington County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| September | 2019-09-20 | 12:21 AM | 09/20/2019 | 12:04 PM | Oklahoma: Oklahoma County; | SPP RE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-24 | 3:56 PM | 09/26/2019 | 7:25 PM | Washington: King County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2019-09-25 | 5:25 PM | 09/25/2019 | 6:16 PM | Wisconsin: Marathon County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2019-09-25 | 9:59 AM | 09/25/2019 | 10:00 AM | Texas: | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| September | 2019-09-25 | 3:47 AM | 09/25/2019 | 3:40 PM | California: Napa County, Nevada County, Placer County, Plumas County, Sonoma County, Butte County, Yuba County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 25 | 69524 | Weather |
| September | 2019-09-26 | 2:31 PM | 09/26/2019 | 3:14 PM | Maryland: Baltimore County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-29 | 7:38 AM | Unknown | Unknown | California: Alameda County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Distribution Interruption | Unknown | 50072 | Distribution Interruption |
| September | 2019-09-30 | 5:35 AM | 09/30/2019 | 8:10 AM | Washington: King County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2019-09-30 | 12:17 PM | 09/30/2019 | 12:58 PM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Actual Physical Attack | 3736 | 0 | Physical Attack |
| September | 2019-09-30 | 10:53 AM | 09/30/2019 | 10:54 AM | Idaho: Bonneville County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2019-10-03 | 12:13 AM | 10/03/2019 | 4:00 AM | Missouri: Reynolds County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2019-10-04 | 5:15 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| October | 2019-10-06 | 5:15 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| October | 2019-10-06 | 2:50 PM | 10/06/2019 | 3:00 PM | Texas: Hidalgo County, Cameron County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| October | 2019-10-09 | 12:27 AM | Unknown | Unknown | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 2400 | 737808 | Weather |
| October | 2019-10-10 | 2:06 AM | 10/10/2019 | 5:05 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-10 | 12:22 AM | 10/10/2019 | 2:12 AM | Colorado: Jefferson County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-11 | 10:56 AM | 10/11/2019 | 11:46 AM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-12 | 3:00 PM | 10/12/2019 | 4:21 PM | Texas: | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2019-10-15 | 7:57 PM | 10/15/2019 | 8:44 PM | Kansas: Shawnee County; | SPP RE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-15 | 3:19 AM | 10/15/2019 | 6:38 AM | Ohio: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2019-10-16 | 7:00 AM | Unknown | Unknown | Texas: Louisiana: Arkansas: Mississippi: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2019-10-17 | 12:45 AM | 10/19/2019 | 9:30 AM | Connecticut: Rhode Island: Massachusetts: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 101683 | Weather |
| October | 2019-10-19 | 2:00 PM | 10/19/2019 | 9:07 PM | California: Imperial County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-19 | 5:57 AM | 10/19/2019 | 1:58 PM | South Dakota: Codington County; Nebraska: Scotts Bluff County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2019-10-20 | 10:15 PM | 10/25/2019 | 2:00 AM | Texas: Cass County, Cameron County, Collin County, Dallas County, Ellis County, Erath County, Hunt County, Kaufman County, Lamar County, Panola County, Rains County, Rockwall County, Rusk County, Tarrant County, Van Zandt County, Wood County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 400000 | Weather |
| October | 2019-10-23 | 12:49 AM | 10/23/2019 | 4:05 AM | New York: Monroe County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-23 | 12:49 AM | 10/23/2019 | 4:05 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-23 | 2:36 PM | Unknown | Unknown | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | Unknown | 50000 | Weather |
| October | 2019-10-24 | 5:15 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| October | 2019-10-24 | 5:02 PM | 10/24/2019 | 5:09 PM | Ohio: Lorain County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2019-10-25 | 2:53 AM | 10/25/2019 | 4:37 AM | South Carolina: Cherokee County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2019-10-26 | 8:07 AM | 10/26/2019 | 8:45 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-26 | 6:00 PM | Unknown | Unknown | Tennessee: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 70000 | Weather |
| October | 2019-10-26 | 5:15 AM | 10/26/2019 | 5:31 PM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 82124 | Weather |
| October | 2019-10-26 | 6:20 PM | 10/31/2019 | 1:27 AM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 3190 | 972000 | Weather |
| October | 2019-10-29 | 1:46 PM | 10/29/2019 | 2:49 PM | Wisconsin: Brown County, Manitowoc County, Calumet County, Winnebago County, Kewaunee County, Door County, Oconto County, Marinette County, Forest County, Langlade County, Oneida County, Vilas County, Lincoln County, Oneida County, Portage County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2019-10-30 | 6:32 AM | 11/01/2019 | 1:29 PM | California: Los Angeles County, Orange County, Riverside County, San Bernardino County, Ventura County, Kern County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | 285 | 114402 | Weather |
| October | 2019-10-31 | 10:00 PM | Unknown | Unknown | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 53943 | Weather |
| November | 2019-11-01 | 11:45 PM | 11/02/2019 | 12:48 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2019-11-01 | 11:45 PM | 11/02/2019 | 12:48 AM | New York: Monroe County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2019-11-01 | 1:00 AM | 11/03/2019 | 1:00 PM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 8000 | Weather |
| November | 2019-11-01 | 2:41 AM | Unknown | Unknown | New York: Broome County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 66325 | Weather |
| November | 2019-11-01 | 1:15 AM | 11/02/2019 | 9:30 PM | Connecticut: Maine: Massachusetts: Rhode Island: New Hampshire: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 80066 | Weather |
| November | 2019-11-03 | 10:17 PM | 11/04/2019 | 11:10 AM | Minnesota: Sherburne County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2019-11-05 | 8:30 AM | 11/05/2019 | 4:16 PM | Indiana: | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2019-11-05 | 3:40 PM | 11/05/2019 | 5:11 PM | Idaho: Elmore County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 131 | Physical Attack |
| November | 2019-11-05 | 8:56 AM | 11/05/2019 | 11:51 AM | Florida: Duval County; | FRCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 1500 | Unknown | Transmission Interruption |
| November | 2019-11-08 | 5:50 AM | 11/08/2019 | 6:10 AM | Utah: California: Oregon: Wyoming: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | System Operations | 72 | Unknown | Operations |
| November | 2019-11-16 | 4:11 PM | 11/16/2019 | 5:01 PM | Oregon: Lane County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2019-11-16 | 6:00 AM | 11/16/2019 | 5:45 PM | Texas: New York: Dutchess County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2019-11-20 | 4:55 PM | 11/20/2019 | 5:37 PM | California: Imperial County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2019-11-20 | 9:49 AM | 11/20/2019 | 3:20 PM | California: Colusa County, Lake County, Mendocino County, Napa County, Solano County, Sonoma County, Yolo County, Shasta County, Tehama County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 178 | 54000 | Weather |
| November | 2019-11-22 | 12:00 AM | 11/22/2019 | 1:10 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2019-11-22 | 12:00 AM | 11/22/2019 | 1:10 AM | New York: Monroe County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2019-11-26 | 6:07 PM | 11/27/2019 | 12:27 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 300 | 93000 | Weather |
| November | 2019-11-27 | 2:44 AM | 11/27/2019 | 4:00 PM | California: Santa Clara County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 35 | 2 | Physical Attack |
| November | 2019-11-27 | 12:00 PM | 11/30/2019 | 2:00 AM | Michigan: Tuscola County, Sanilac County, Huron County, St. Clair County, Macomb County, Oakland County, Wayne County, Livingston County, Washtenaw County, Monroe County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 30 | 107000 | Weather |
| November | 2019-11-29 | 12:00 AM | 12/01/2019 | 12:00 AM | Texas: Dawson County; | TRE | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Actual Physical Attack | 0 | 0 | Physical Attack |
| December | 2019-12-03 | 7:16 PM | 12/03/2019 | 7:49 PM | Alabama: Covington County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2019-12-03 | 6:55 AM | Unknown | Unknown | California: Fresno County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| December | 2019-12-05 | 4:48 PM | 12/09/2019 | 5:16 AM | Ohio: Kentucky: | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2019-12-05 | 12:00 AM | Unknown | Unknown | Washington: Chelan County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| December | 2019-12-07 | 6:10 AM | 12/08/2019 | 2:20 AM | Oklahoma: Stephens County; | SPP RE | Physical attack that causes major interruptions or impacts to critical infrastructure or to operations. | Actual Physical Attack | 2 | 400 | Physical Attack |
| December | 2019-12-08 | 1:40 PM | 12/08/2019 | 1:41 PM | Texas: Dallas County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2019-12-11 | 1:22 PM | 12/11/2019 | 4:28 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2019-12-11 | 8:53 PM | 12/11/2019 | 9:33 PM | Oklahoma: Stephens County; | SPP RE | Physical attack that causes major interruptions or impacts to critical infrastructure or to operations. | Actual Physical Attack | 1 | 392 | Physical Attack |
| December | 2019-12-11 | 1:27 PM | 12/11/2019 | 1:51 PM | North Dakota: Burleigh County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 18 | 1 | Transmission Interruption |
| December | 2019-12-16 | 11:55 PM | 12/17/2019 | 1:47 AM | Texas: | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| December | 2019-12-18 | 2:30 PM | 12/18/2019 | 3:25 PM | Texas: Nueces County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2019-12-19 | 2:58 AM | 12/19/2019 | 3:46 AM | Nebraska: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2019-12-24 | 3:30 PM | 12/24/2019 | 7:34 PM | Illinois: | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2019-12-31 | 12:00 PM | 12/31/2019 | 1:00 PM | Washington: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2019-12-31 | 11:03 AM | 01/01/2020 | 10:59 AM | Texas: Nueces County; | TRE | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blocked out area or within the partial failure of an integrated electrical system. | Transmission Interruption | 25 | 0 | Transmission Interruption |
| January | 2020-01-09 | 8:45 PM | 1/10/2020 | 9:23 PM | Washington: King County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | Suspicious Activity | 0 | 0 | Cyber Attack |
| January | 2020-01-09 | 7:40 AM | 1/9/2020 | 8:48 AM | Minnesota: North Dakota: Wisconsin: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2020-01-09 | 11:07 PM | 1/9/2020 | 11:18 PM | Arkansas: | SPP RE | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | System Operations | Unknown | Unknown | Operations |
| January | 2020-01-09 | 11:07 PM | 1/9/2020 | 11:19 PM | Arkansas: Yell County; | SPP RE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| January | 2020-01-10 | 2:53 PM | Unknown | Unknown | Tennessee: Hamilton County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2020-01-11 | 2:25 AM | 1/11/2020 | 7:56 AM | Arkansas: Cross County; | SPP RE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 22 | 7,541 | Weather |
| January | 2020-01-11 | 12:50 PM | 1/12/2020 | 1:33 PM | Alabama: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 219 | 30,715 | Weather |
| January | 2020-01-11 | 11:02 PM | 1/12/2020 | 2:01 AM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 66,475 | Weather |
| January | 2020-01-11 | 3:30 AM | 1/11/2020 | 5:30 PM | Arkansas: Texas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 68,138 | Weather |
| January | 2020-01-11 | 1:20 PM | Unknown | Unknown | Tennessee: | SERC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 4 | Unknown | Weather |
| January | 2020-01-12 | 11:15 AM | 1/12/2020 | 11:18 AM | Texas: Brazos County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2020-01-14 | 12:00 AM | 1/14/2020 | 1:00 AM | Florida: Alachua County; | FRCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2020-01-16 | 11:06 AM | 1/16/2020 | 11:36 AM | Texas: Harris County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2020-01-17 | 5:28 AM | 1/17/2020 | 10:13 AM | California: Humboldt County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather/Transmission Interruption | 87 | 67,864 | Weather |
| January | 2020-01-20 | 6:30 AM | 1/20/2020 | 6:31 AM | California: Los Angeles County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| January | 2020-01-22 | 2:57 AM | 1/22/2020 | 3:17 AM | Nevada: Humboldt County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 7 | 3,120 | Physical Attack |
| January | 2020-01-23 | 11:30 PM | 1/24/2020 | 12:39 AM | Florida: Manatee County; | FRCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| January | 2020-01-24 | 4:34 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| January | 2020-01-27 | 2:10 PM | 1/27/2020 | 6:58 PM | North Dakota: South Dakota: Montana: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 540 | 130,000 | Operations |
| January | 2020-01-30 | 3:01 AM | 1/30/2020 | 4:36 AM | North Dakota: Burleigh County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 75 | 0 | Transmission Interruption |
| January | 2020-01-31 | 9:50 AM | 2/3/2020 | 10:00 AM | California: | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | Suspicious Activity | 0 | 0 | Cyber Attack |
| February | 2020-02-06 | 1:30 PM | 2/7/2020 | 8:08 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | Unknown | 89,500 | Weather |
| February | 2020-02-06 | 2:29 PM | 2/7/2020 | 12:44 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 284,256 | Weather |
| February | 2020-02-07 | 2:42 PM | 2/10/2020 | 9:25 AM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 7,500 | Weather |
| February | 2020-02-07 | 11:00 AM | Unknown | Unknown | Pennsylvania: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 52,000 | Weather |
| February | 2020-02-07 | 8:48 AM | Unknown | Unknown | Virginia: North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 87,000 | Weather |
| February | 2020-02-07 | 4:25 PM | 2/8/2020 | 12:00 PM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 123,359 | Weather |
| February | 2020-02-08 | 1:56 PM | 2/8/2020 | 3:04 PM | California: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2020-02-09 | 9:30 AM | 2/9/2020 | 9:40 PM | California: Alameda County, Contra Costa County, El Dorado County, Nevada County, Placer County, Sierra County, Santa Clara County, Napa County, Marin County, Santa Cruz County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 500 | 145,000 | Weather |
| February | 2020-02-11 | 2:53 AM | 2/11/2020 | 1:30 PM | Texas: Sterling County; | TRE | Cyber event that could potentially impact electric power system adequacy or reliability. | System Operations | 0 | 0 | Cyber Attack |
| February | 2020-02-11 | 7:13 AM | 2/11/2020 | 4:00 PM | Oregon: Clackamas County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | 0 | Transmission Interruption |
| February | 2020-02-12 | 7:36 AM | 2/12/2020 | 8:53 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2020-02-13 | 8:01 AM | 2/13/2020 | 2:38 PM | Oregon: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2020-02-17 | 1:18 PM | 2/20/2020 | 9:51 AM | Michigan: Eaton County; | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| February | 2020-02-17 | 9:47 AM | 2/17/2020 | 3:31 PM | Alabama: Chambers County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 97 | Unknown | Physical Attack |
| February | 2020-02-17 | 4:00 AM | Unknown | Unknown | Northern and Central California; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 91 | 70,000 | Weather |
| February | 2020-02-18 | 1:00 PM | 2/18/2020 | 2:00 PM | California: Kern County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| February | 2020-02-25 | 11:45 AM | 2/25/2020 | 1:00 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2020-02-26 | 4:30 PM | 2/26/2020 | 5:02 PM | Oklahoma: | SPP RE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2020-02-26 | 5:00 PM | 2/26/2020 | 6:05 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2020-02-26 | 11:29 AM | 2/26/2020 | 12:14 PM | South Dakota: Wyoming: Colorado: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2020-02-29 | 1:45 AM | 2/29/2020 | 2:30 AM | Nevada: Clark County, Washoe County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-01 | 8:00 AM | Unknown | Unknown | Western NY | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 675 | Unknown | Fuel Supply Deficiency |
| March | 2020-03-01 | 10:15 PM | Unknown | Unknown | New York: | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-01 | 11:27 AM | 03/01/2020 | 9:47 PM | Mississippi: Rankin County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 19 | 3136 | Transmission Interruption |
| March | 2020-03-02 | 1:43 AM | 03/02/2020 | 2:43 AM | Nevada: Clark County, Washoe County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-03 | 2:30 PM | 03/03/2020 | 2:31 PM | Alabama: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-08 | 10:10 PM | 03/09/2020 | 1:02 AM | Texas: Llano County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2020-03-12 | 1:03 AM | 03/12/2020 | 3:00 AM | Pennsylvania: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 40 | 15864 | Transmission Interruption |
| March | 2020-03-16 | 8:00 AM | 03/16/2020 | 8:01 AM | California: Los Angeles County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-16 | 8:00 AM | 03/16/2020 | 8:01 AM | California: Los Angeles County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-16 | 12:01 PM | 03/16/2020 | 1:10 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 165 | 110800 | Weather |
| March | 2020-03-17 | 10:30 AM | 03/17/2020 | 11:41 AM | Michigan: Washtenaw County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 6062 | 0 | Operations |
| March | 2020-03-18 | 7:09 AM | Unknown | Unknown | Utah: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Natural Disaster | 237 | 73000 | Natural Disaster |
| March | 2020-03-19 | 5:05 PM | 03/19/2020 | 5:43 PM | Minnesota: St. Louis County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-20 | 10:20 PM | 03/20/2020 | 11:30 PM | Connecticut: Massachusetts: Rhode Island: Maine: New Hampshire: Vermont: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-20 | 11:38 PM | 03/20/2020 | 11:59 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-20 | 11:45 PM | 03/21/2020 | 12:30 AM | Connecticut: Massachusetts: | NPCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-23 | 12:15 AM | 03/25/2020 | 5:11 PM | Wisconsin: Columbia County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-23 | 2:15 PM | 03/23/2020 | 4:37 PM | Virginia: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Sabotage | Unknown | 1,018 | Physical Attack |
| March | 2020-03-24 | 12:45 PM | 03/24/2020 | 2:00 PM | California: Nevada County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2020-03-24 | 2:55 AM | 03/24/2020 | 6:50 AM | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 51026 | Weather |
| March | 2020-03-25 | 10:31 AM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2020-03-26 | 9:29 PM | 03/26/2020 | 9:47 PM | Ohio: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 19 | 11964 | Transmission Interruption |
| March | 2020-03-27 | 1:06 PM | 03/27/2020 | 1:58 PM | Delaware: Kent County, New Castle County, Sussex County; Maryland: Cecil County, Harford County, Talbot County, Kent County, Queen Anne's County, Dorchester County, Wicomico County, Worcester County, Somerset County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-27 | 1:06 PM | 03/27/2020 | 1:58 PM | New Jersey: Atlantic County, Cape May County, Cumberland County, Gloucester County, Salem County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2020-03-29 | 8:27 PM | 03/29/2020 | 11:04 PM | Mississippi: Panola County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 4 | 1558 | Transmission Interruption |
| March | 2020-03-31 | 11:45 AM | 03/31/2020 | 8:00 PM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 412 | 57744 | Weather |
| April | 2020-04-01 | 9:43 PM | 04/01/2020 | 10:18 PM | Illinois: Williamson County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2020-04-02 | 6:41 PM | 04/02/2020 | 7:23 PM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2020-04-02 | 8:45 PM | Unknown | Unknown | Washington: Wallula | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | Unknown | Unknown | Physical Attack |
| April | 2020-04-02 | 1:37 PM | 04/02/2020 | 2:43 PM | Nebraska: York County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 5 | Unknown | Transmission Interruption |
| April | 2020-04-03 | 9:13 AM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-05 | 2:30 AM | 04/05/2020 | 3:01 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2020-04-05 | 3:46 PM | 04/05/2020 | 5:35 PM | California: Stanislaus County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 7 | 6814 | Weather |
| April | 2020-04-07 | 11:39 PM | 04/07/2020 | 11:46 PM | Washington: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2020-04-08 | 9:57 PM | 04/09/2020 | 8:59 AM | Ohio: Kentucky: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 78314 | Weather |
| April | 2020-04-08 | 1:21 AM | 04/08/2020 | 3:56 AM | Ohio: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 82509 | Weather |
| April | 2020-04-08 | 10:03 PM | 04/09/2020 | 7:36 AM | Indiana: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 93000 | Weather |
| April | 2020-04-09 | 7:34 AM | 04/09/2020 | 5:40 PM | Wisconsin: Dane County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2020-04-09 | 7:25 PM | 04/10/2020 | 3:30 AM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 95000 | Weather |
| April | 2020-04-09 | 7:40 PM | 04/11/2020 | 10:00 PM | Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 340000 | Weather |
| April | 2020-04-10 | 10:00 AM | 04/10/2020 | 4:19 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2020-04-10 | 4:00 PM | Unknown | Unknown | Nevada: White Pine County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-11 | 5:40 PM | 04/11/2020 | 5:51 PM | Utah: Salt Lake City | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| April | 2020-04-11 | 11:24 AM | 04/11/2020 | 11:42 AM | Wyoming: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2020-04-12 | 1:00 PM | 04/12/2020 | 7:27 PM | Louisiana: Acadia Parish, Iberville Parish, Jefferson Davis Parish, Concordia Parish, Winn Parish, Catahoula Parish, Terrebonne Parish, St. Mary Parish; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Severe Weather | 122 | 37991 | Weather |
| April | 2020-04-12 | 8:30 PM | 04/14/2020 | 9:00 AM | Arkansas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 51000 | Weather |
| April | 2020-04-12 | 5:00 PM | 04/14/2020 | 1:25 AM | Mississippi: Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 448 | 62828 | Weather |
| April | 2020-04-12 | 6:13 PM | 04/13/2020 | 3:23 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 63289 | Weather |
| April | 2020-04-12 | 8:45 PM | Unknown | Unknown | Arkansas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 95318 | Weather |
| April | 2020-04-12 | 9:28 PM | 04/15/2020 | 12:00 PM | Virginia: West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 104000 | Weather |
| April | 2020-04-13 | 1:05 PM | 04/14/2020 | 4:00 PM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 68476 | Weather |
| April | 2020-04-13 | 8:08 AM | Unknown | Unknown | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 72233 | Weather |
| April | 2020-04-13 | 10:25 AM | 04/13/2020 | 6:55 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 95000 | Weather |
| April | 2020-04-13 | 12:45 AM | 04/13/2020 | 3:00 AM | Tennessee: Hamilton County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 120000 | Weather |
| April | 2020-04-13 | 3:30 AM | 04/14/2020 | 6:18 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 216400 | Weather |
| April | 2020-04-13 | 7:31 AM | 04/13/2020 | 2:00 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | Unknown | Weather |
| April | 2020-04-16 | 11:30 AM | 04/16/2020 | 3:45 PM | Georgia: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-18 | 7:38 PM | Unknown | Unknown | Nevada: Washoe County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-19 | 1:14 AM | 04/20/2020 | 11:42 AM | North Dakota: Burleigh County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2020-04-20 | 12:42 PM | 04/20/2020 | 1:27 PM | South Dakota: Deuel County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-20 | 12:59 AM | 04/20/2020 | 8:40 AM | Alabama: Mississippi: Georgia: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 552 | 77341 | Weather |
| April | 2020-04-23 | 8:00 AM | 04/23/2020 | 11:40 PM | Alabama: Georgia: Mississippi: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 375 | 52163 | Weather |
| April | 2020-04-23 | 4:30 AM | 04/23/2020 | 7:00 AM | Mississippi: Arkansas: Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55184 | Weather |
| April | 2020-04-24 | 9:00 PM | 04/24/2020 | 9:33 PM | California: Placer County, Nevada County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | System Operations | 5 | 945 | Operations |
| April | 2020-04-24 | 10:00 PM | Unknown | Unknown | Nevada: White Pine County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-25 | 9:25 PM | 04/25/2020 | 9:56 PM | Oregon: Multnomah County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2020-04-26 | 1:38 AM | Unknown | Unknown | Florida: | FRCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 49999 | Weather |
| April | 2020-04-28 | 8:01 PM | 04/28/2020 | 11:21 PM | Texas: Jefferson County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 14 | 1 | Transmission Interruption |
| April | 2020-04-29 | 6:00 AM | 04/29/2020 | 12:31 PM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 77933 | Weather |
| April | 2020-04-29 | 5:55 AM | 04/29/2020 | 7:00 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 146660 | Weather |
| April | 2020-04-30 | 3:00 PM | Unknown | Unknown | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 78007 | Weather |
| May | 2020-05-04 | 11:59 AM | 05/07/2020 | 8:00 PM | Tennessee: Davidson County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 500 | 130000 | Weather |
| May | 2020-05-08 | 1:45 PM | 05/08/2020 | 1:46 PM | Nevada: Nye County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-13 | 11:16 PM | 05/14/2020 | 1:52 PM | Indiana: Hendricks County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2020-05-13 | 5:12 AM | 05/13/2020 | 2:07 PM | Washington: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| May | 2020-05-14 | 11:23 AM | 05/14/2020 | 11:25 AM | Oregon: Jackson County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-15 | 5:55 PM | 05/17/2020 | 6:00 PM | New York: Saratoga County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 52 | Weather |
| May | 2020-05-16 | 12:00 AM | 05/16/2020 | 12:30 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2020-05-18 | 11:51 PM | 05/19/2020 | 4:37 AM | South Carolina: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2020-05-18 | 9:27 AM | 05/18/2020 | 10:15 AM | Oregon: Clackamas County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2020-05-19 | 8:17 AM | 05/19/2020 | 8:18 AM | Idaho: Bonneville County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-19 | 1:45 PM | 05/19/2020 | 1:46 PM | Arkansas: | SPP RE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2020-05-19 | 8:04 PM | 05/19/2020 | 10:00 PM | Alabama: Jefferson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 8 | 6,000 | Physical Attack |
| May | 2020-05-20 | 11:41 AM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-22 | 4:35 PM | 05/23/2020 | 3:29 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 108190 | Weather |
| May | 2020-05-24 | 4:45 PM | Unknown | Unknown | Central Oklahoma | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 54000 | Weather |
| May | 2020-05-25 | 10:58 AM | 05/25/2020 | 1:00 PM | Texas: Kerr County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 8 | 3745 | Transmission Interruption |
| May | 2020-05-27 | 5:20 PM | Unknown | Unknown | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 273269 | Weather |
| May | 2020-05-27 | 5:15 PM | 05/29/2020 | 6:30 AM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 382000 | Weather |
| May | 2020-05-29 | 5:30 PM | 05/31/2020 | 6:00 PM | Minnesota: Hennepin County; | MRO | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | System Operations | 0 | 0 | Physical Attack |
| May | 2020-05-29 | 9:37 PM | 05/30/2020 | 4:29 AM | Ohio: Franklin County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-29 | 5:01 PM | 05/29/2020 | 6:57 PM | Pennsylvania: Warren County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| May | 2020-05-30 | 10:20 PM | 05/30/2020 | 11:00 PM | Texas: Bexar County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2020-05-31 | 9:30 PM | 06/01/2020 | 1:00 AM | Alabama: Jefferson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2020-05-31 | 12:15 AM | Unknown | Unknown | Pennsylvania: | RF | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Vandalism | 0 | 0 | Physical Attack |
| June | 2020-06-02 | 2:36 PM | 06/02/2020 | 2:37 PM | Idaho: Blaine County, Jerome County, Minidoka County, Power County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| June | 2020-06-03 | 4:57 PM | 06/03/2020 | 5:29 PM | North Dakota: Minnesota: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2020-06-03 | 1:36 PM | 06/03/2020 | 4:30 PM | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 78079 | Weather |
| June | 2020-06-03 | 1:00 PM | 06/06/2020 | 4:30 PM | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 80 | 87000 | Weather |
| June | 2020-06-03 | 12:30 PM | 06/03/2020 | 6:00 PM | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 708000 | Weather |
| June | 2020-06-09 | 11:21 AM | 06/09/2020 | 12:01 PM | Washington: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| June | 2020-06-10 | 5:24 PM | 06/11/2020 | 6:00 PM | Ohio: Indiana: Kentucky: West Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 85822 | Weather |
| June | 2020-06-10 | 7:30 PM | Unknown | Unknown | Michigan: Oakland County, Macomb County, Wayne County, Sanilac County, Tuscola County, Huron County, Lapeer County, Livingston County, Monroe County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 237000 | Weather |
| June | 2020-06-10 | 12:22 PM | 06/10/2020 | 5:00 PM | Michigan: Gratiot County, Lake County, Missaukee County, Benzie County, Leelanau County, Manistee County, Wexford County, Montcalm County, Kent County, Ottawa County, Van Buren County, St. Joseph County, Arenac County, Saginaw County, Calhoun County, Branch County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 270000 | Weather |
| June | 2020-06-12 | 8:21 AM | 06/12/2020 | 8:22 AM | Michigan: Houghton County; | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| June | 2020-06-18 | 12:11 PM | 06/22/2020 | 8:11 AM | Colorado: El Paso County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 0 | 0 | Physical Attack |
| June | 2020-06-18 | 8:32 PM | 06/18/2020 | 8:35 PM | Kentucky: Gallatin County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| June | 2020-06-21 | 1:16 AM | 06/21/2020 | 6:45 PM | Delaware: New Castle County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2020-06-22 | 11:44 AM | 06/22/2020 | 12:42 PM | Pennsylvania: Allegheny County, Beaver County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2020-06-25 | 9:40 AM | 06/25/2020 | 11:00 AM | Kentucky: Madison County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | 0 | Physical Attack |
| June | 2020-06-26 | 12:47 PM | 06/26/2020 | 1:53 PM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2020-06-26 | 4:20 PM | 06/29/2020 | 3:00 PM | North Dakota: Mountrail County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2020-06-27 | 4:00 PM | 06/28/2020 | 2:27 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 33480 | 78109 | Weather |
| June | 2020-06-29 | 2:32 PM | 06/29/2020 | 4:35 PM | Arkansas: Garland County; | SPP RE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| June | 2020-06-30 | 10:28 AM | 06/30/2020 | 10:29 AM | Oregon: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| July | 2020-07-01 | 7:26 PM | 07/01/2020 | 7:44 PM | Pennsylvania: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 32 | 2013 | Transmission Interruption |
| July | 2020-07-02 | 8:30 PM | Unknown | Unknown | California: Butte County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2020-07-06 | 6:45 PM | 07/06/2020 | 7:42 PM | District of Columbia: Maryland: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2020-07-06 | 12:26 PM | Unknown | Unknown | New York: Kings County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2020-07-07 | 11:38 AM | 07/07/2020 | 6:24 PM | California: Los Angeles County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2020-07-07 | 1:09 PM | 07/08/2020 | 8:17 AM | Colorado: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2020-07-07 | 7:17 PM | 07/07/2020 | 11:49 PM | West Virginia: Wyoming County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | Unknown | Unknown | Weather |
| July | 2020-07-08 | 6:45 PM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2020-07-08 | 10:04 PM | Unknown | Unknown | Texas: | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 0 | 0 | Physical Attack |
| July | 2020-07-09 | 3:09 PM | Unknown | Unknown | Washington: Thurston County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2020-07-11 | 4:55 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| July | 2020-07-11 | 11:30 PM | 07/12/2020 | 6:30 AM | Oklahoma: Arkansas: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 68000 | Weather |
| July | 2020-07-11 | 9:30 PM | Unknown | Unknown | Oklahoma: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 94700 | Weather |
| July | 2020-07-12 | 2:08 PM | 07/12/2020 | 8:44 PM | Nevada: Washoe County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 36 | 10,000 | Physical Attack |
| July | 2020-07-12 | 4:30 AM | 07/13/2020 | 5:00 AM | Texas: Collin County, Dallas County, Denton County, Rockwall County, Tarrant County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 48000 | Weather |
| July | 2020-07-13 | 4:30 PM | 07/13/2020 | 4:31 PM | Kentucky: Madison County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2020-07-14 | 2:16 PM | 07/14/2020 | 2:53 PM | California: | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2020-07-15 | 11:00 AM | 07/15/2020 | 11:20 AM | Kentucky: Madison County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | 0 | Physical Attack |
| July | 2020-07-16 | 8:49 AM | 07/16/2020 | 11:06 AM | North Dakota: Minnesota: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 475 | 0 | Operations |
| July | 2020-07-17 | 11:00 PM | 07/17/2020 | 11:30 PM | Oklahoma: | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2020-07-17 | 7:24 PM | Unknown | Unknown | New York: | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2020-07-19 | 10:30 AM | Unknown | Unknown | New York: Niagara County | NPCC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 675 | Fuel Supply Deficiency | |
| July | 2020-07-19 | 2:30 PM | 07/21/2020 | 6:48 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 158500 | Weather |
| July | 2020-07-20 | 12:57 AM | 07/20/2020 | 2:34 AM | Texas: Travis County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 21 | 14,096 | Physical Attack |
| July | 2020-07-21 | 11:53 AM | 07/21/2020 | 1:00 PM | Washington: Pierce County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 19 | 11,000 | Physical Attack |
| July | 2020-07-22 | 11:30 AM | 07/22/2020 | 2:19 PM | West Virginia: Tucker County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2020-07-24 | 8:25 AM | Unknown | Unknown | New York: Bronx County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2020-07-25 | 9:00 PM | 07/26/2020 | 4:00 PM | Texas: Hidalgo County, Cameron County, Starr County, Kenedy County, Willacy County, Brooks County, Jim Hogg County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 125 | 84000 | Weather |
| July | 2020-07-25 | 7:58 PM | 07/27/2020 | 7:00 PM | Texas: Nueces County, Kleberg County, Cameron County, Willacy County, Hidalgo County, Starr County, Kenedy County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 201208 | Weather |
| July | 2020-07-28 | 3:00 PM | 07/28/2020 | 11:00 PM | Michigan: Jackson County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2020-07-30 | 5:54 PM | 07/30/2020 | 8:18 PM | Nebraska: Scotts Bluff County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| August | 2020-08-01 | 8:16 AM | 08/01/2020 | 9:15 AM | California: San Diego County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-01 | 11:14 AM | 08/10/2020 | 9:26 PM | Texas: Cameron County, Willacy County, Hidalgo County, Starr County; | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-01 | 12:00 AM | 08/01/2020 | 12:01 AM | Texas: Cameron County, Hidalgo County, Starr County, Willacy County; | TRE | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-02 | 7:43 PM | 08/02/2020 | 10:27 PM | Illinois: Rock Island County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| August | 2020-08-03 | 8:00 AM | 08/03/2020 | 1:00 PM | Texas: Ector County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2020-08-03 | 11:15 PM | 08/06/2020 | 7:00 AM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 340000 | Weather |
| August | 2020-08-03 | 11:02 PM | Unknown | Unknown | North Carolina: | SERC | Complete loss of off-site power (LOOP) affecting a nuclear generating station per the Nuclear Plant Interface Requirements. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-04 | 10:30 AM | Unknown | Unknown | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 70000 | Weather |
| August | 2020-08-04 | 11:20 AM | 08/07/2020 | 10:55 AM | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 60 | 75000 | Weather |
| August | 2020-08-04 | 2:35 PM | 08/10/2020 | 11:00 AM | New York: Broome County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 76120 | Weather |
| August | 2020-08-04 | 2:35 PM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 76120 | Weather |
| August | 2020-08-04 | 9:00 AM | 08/05/2020 | 6:00 PM | Delaware: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 100000 | Weather |
| August | 2020-08-04 | 2:00 PM | 08/08/2020 | 12:00 PM | New York: Dutchess County, Orange County, Ulster County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 116818 | Weather |
| August | 2020-08-04 | 6:01 AM | 08/06/2020 | 3:30 PM | North Carolina: Brunswick County, Columbus County, Pender County, Duplin County, Onslow County, Jones County, Craven County, Jones County, Beaufort County, Bertie County, Chowan County, Gates County, Perquimans County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 311 | 125987 | Weather |
| August | 2020-08-04 | 12:00 PM | Unknown | Unknown | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 137103 | Weather |
| August | 2020-08-04 | 12:00 PM | 08/07/2020 | 6:00 AM | New York: Rockland County, Orange County, Sullivan County; New Jersey: Bergen County, Passaic County, Sussex County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 160000 | Weather |
| August | 2020-08-04 | 1:31 PM | Unknown | Unknown | New York: Bronx County, Richmond County, Queens County, Kings County, Westchester County, New York County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 271119 | Weather |
| August | 2020-08-04 | 1:00 PM | 08/04/2020 | 11:59 PM | New York: Nassau County, Suffolk County, Queens County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 3907 | 420000 | Weather |
| August | 2020-08-04 | 4:41 AM | 08/05/2020 | 4:26 PM | Virginia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 508000 | Weather |
| August | 2020-08-04 | 12:18 PM | 08/08/2020 | 5:31 PM | New Jersey: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 788000 | Weather |
| August | 2020-08-04 | 3:15 PM | 08/07/2020 | 10:27 AM | Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 2000 | 1188247 | Weather |
| August | 2020-08-05 | 5:58 PM | 08/05/2020 | 8:53 PM | Texas: Orange County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 89 | 19785 | Transmission Interruption |
| August | 2020-08-07 | 5:13 AM | Unknown | Unknown | New York: Queens County, New York County; | NPCC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident. | Severe Weather | 500 | 187068 | Weather |
| August | 2020-08-10 | 10:25 PM | 08/10/2020 | 11:02 PM | New York: Onondaga County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-10 | 10:39 PM | 08/13/2020 | 3:48 PM | Indiana: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 95300 | Weather |
| August | 2020-08-10 | 4:00 PM | 08/13/2020 | 3:00 PM | Illinois: Missouri: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 135000 | Weather |
| August | 2020-08-10 | 12:38 PM | Unknown | Unknown | Iowa: | MRO | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident. | Severe Weather | 1400 | 250000 | Weather |
| August | 2020-08-10 | 10:00 AM | Unknown | Unknown | Iowa: Dallas County, Polk County, Warren County, Madison County, Johnson County, Scott County; Illinois: Rock Island County, Henry County, Mercer County; | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 950 | 300000 | Weather |
| August | 2020-08-10 | 2:30 PM | Unknown | Unknown | Illinois: Cook County, Will County, DuPage County, Lake County, Kane County, Grundy County, LaSalle County, DeKalb County, McHenry County, Lee County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 856000 | Weather |
| August | 2020-08-10 | 11:00 AM | 08/10/2020 | 4:00 PM | Iowa: Webster County, Greene County, Dallas County, Hamilton County, Boone County, Polk County, Hardin County, Story County, Jasper County, Grundy County, Marshall County, Tama County, Poweshiek County, Benton County, Iowa County, Linn County, Johnson County, Jones County, Cedar County, Muscatine County, Jackson County, Clinton County, Scott County; | MRO | Uncontrolled loss of 200 Megawatts or more of firm system loads for 15 minutes or more from a single incident for entities with previous year's peak demand less than or equal to 3,000 Megawatts. | Severe Weather | 550 | Unknown | Weather |
| August | 2020-08-10 | 12:49 PM | Unknown | Unknown | Iowa: | MRO | Complete loss of off-site power (LOOP) affecting a nuclear generating station per the Nuclear Plant Interface Requirements. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-13 | 1:51 PM | 08/13/2020 | 4:27 PM | Texas: El Paso County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 218 | 57060 | Operations |
| August | 2020-08-14 | 6:45 PM | 08/14/2020 | 9:12 PM | California: Kern County, Kings County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Santa Barbara County, Tulare County, Ventura County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 1419 | 132000 | Operations |
| August | 2020-08-14 | 6:36 PM | 08/14/2020 | 8:42 PM | California: | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 560 | 220000 | Operations |
| August | 2020-08-14 | 4:39 PM | 08/14/2020 | 5:42 PM | Louisiana: St. Charles Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 101 | 12671 | Transmission Interruption |
| August | 2020-08-14 | 8:00 PM | 08/16/2020 | 5:00 PM | Minnesota: Anoka County, Hennepin County, Ramsey County, Washington County; | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 60000 | Weather |
| August | 2020-08-14 | 5:15 PM | 08/15/2020 | 9:00 PM | California: | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 1120 | Unknown | Weather |
| August | 2020-08-15 | 3:00 PM | 08/15/2020 | 7:45 PM | California: Inyo County, Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Tulare County, Ventura County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 200 | 70000 | Operations |
| August | 2020-08-15 | 6:25 PM | 08/15/2020 | 7:44 PM | California: | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 459 | 220000 | Operations |
| August | 2020-08-15 | 5:41 PM | 08/15/2020 | 6:48 PM | Connecticut: New Haven County[13]; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2020-08-15 | 5:00 PM | Unknown | Unknown | Washington: Snohomish County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 8 | Physical Attack |
| August | 2020-08-15 | 2:53 PM | 08/15/2020 | 8:00 PM | California: | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 795 | Unknown | Weather |
| August | 2020-08-16 | 3:44 AM | 08/17/2020 | 2:18 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 409 | 124266 | Weather |
| August | 2020-08-16 | 8:00 PM | 08/18/2020 | 9:00 PM | Texas: Collin County, Dallas County, Denton County, Tarrant County, Ellis County, Kaufman County, Johnson County, Anderson County, Angelina County, Grayson County, Smith County, Wichita County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 300000 | Weather |
| August | 2020-08-16 | 5:30 PM | 08/16/2020 | 7:10 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 712 | Unknown | Weather |
| August | 2020-08-17 | 8:21 AM | 08/17/2020 | 9:01 AM | California: Yuba County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 2 | 2 | Weather |
| August | 2020-08-17 | 3:05 PM | 08/17/2020 | 9:24 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 829 | Unknown | Weather |
| August | 2020-08-18 | 9:55 PM | 08/18/2020 | 10:10 PM | California: Imperial County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-18 | 7:00 PM | 08/18/2020 | 7:30 PM | California: Kings County; | WECC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Potential Physical Attack | 0 | 0 | Physical Attack |
| August | 2020-08-18 | 2:44 PM | 08/18/2020 | 3:14 PM | Texas: Culberson County, Reeves County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 205 | 238 | Transmission Interruption |
| August | 2020-08-18 | 2:00 PM | 08/18/2020 | 9:00 PM | Nevada: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 7800 | 1400000 | Weather |
| August | 2020-08-18 | 1:30 PM | 08/18/2020 | 8:30 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 917 | Unknown | Weather |
| August | 2020-08-18 | 2:30 PM | Unknown | Unknown | Arizona: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | Unknown | Weather |
| August | 2020-08-19 | 1:27 AM | 08/19/2020 | 3:03 AM | Ohio: Trumbull County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 22 | 16107 | Transmission Interruption |
| August | 2020-08-19 | 2:00 PM | 08/19/2020 | 9:00 PM | Arizona: Maricopa County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 1200 | 0 | Weather |
| August | 2020-08-19 | 2:00 PM | 08/19/2020 | 9:00 PM | Nevada: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 7500 | 1400000 | Weather |
| August | 2020-08-19 | 12:00 PM | 08/19/2020 | 9:00 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-20 | 12:03 AM | 08/20/2020 | 2:05 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-20 | 9:17 AM | 08/20/2020 | 1:42 PM | Mississippi: Jasper County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2020-08-20 | 3:29 PM | 08/20/2020 | 3:39 PM | Nebraska: Custer County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 60 | Unknown | Transmission Interruption |
| August | 2020-08-23 | 10:12 PM | 08/23/2020 | 10:15 PM | West Virginia: Putnam County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2020-08-23 | 10:30 AM | Unknown | Unknown | Texas panhandle, SE NM | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-24 | 11:00 PM | 08/24/2020 | 11:59 PM | Texas: Denton County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Potential Physical Attack | 0 | 0 | Physical Attack |
| August | 2020-08-25 | 2:43 AM | 08/25/2020 | 7:43 AM | Colorado: Jefferson County; | WECC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Vandalism | 0 | 0 | Physical Attack |
| August | 2020-08-27 | 12:29 PM | 08/27/2020 | 12:59 PM | Nebraska: Douglas County, Burt County, Washington County, Dodge County, Colfax County, Saunders County, Sarpy County, Cass County, Otoe County, Johnson County, Nemaha County, Pawnee County, Richardson County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-27 | 6:00 AM | 08/27/2020 | 6:05 AM | West Virginia: Putnam County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 2900 | Unknown | Physical Attack |
| August | 2020-08-27 | 7:40 AM | 08/31/2020 | 3:33 AM | Louisiana: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 47927 | Weather |
| August | 2020-08-27 | 5:00 AM | 09/03/2020 | 12:00 PM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 200 | 50000 | Weather |
| August | 2020-08-27 | 5:11 PM | 08/28/2020 | 10:00 AM | Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 100 | 60687 | Weather |
| August | 2020-08-27 | 7:40 AM | 08/31/2020 | 7:40 AM | Louisiana: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 130000 | Weather |
| August | 2020-08-27 | 1:15 AM | Unknown | Unknown | Texas: Louisiana: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 615992 | Weather |
| August | 2020-08-27 | 7:00 AM | 08/30/2020 | 7:00 PM | Louisiana: Rapides Parish; | SERC | Complete operational failure or shut-down of the transmission and/or distribution of electrical system. | Severe Weather | 48 | Unknown | Weather |
| August | 2020-08-27 | 12:44 PM | 08/27/2020 | 11:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-27 | 12:06 PM | 08/27/2020 | 10:49 PM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 581 | Unknown | Weather |
| August | 2020-08-27 | 12:02 PM | 08/27/2020 | 10:54 PM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 573 | Unknown | Weather |
| August | 2020-08-27 | 1:24 PM | Unknown | Unknown | Texas: Montgomery County, Liberty County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 208 | Unknown | Weather |
| August | 2020-08-27 | 12:06 PM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 350 | Unknown | Weather |
| August | 2020-08-27 | 3:14 AM | Unknown | Unknown | Louisiana: Calcasieu Parish, Beauregard Parish, Iberia Parish, Acadia Parish, Evangeline Parish, Rapides Parish, St. Landry Parish, Vernon Parish; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-28 | 12:25 AM | 08/28/2020 | 1:00 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2020-08-28 | 4:27 PM | 08/28/2020 | 7:26 PM | Washington: Oregon: | WECC | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | Severe Weather | 0 | 0 | Weather |
| August | 2020-08-29 | 3:35 AM | 08/29/2020 | 5:45 AM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Severe Weather | Unknown | Unknown | Weather |
| August | 2020-08-31 | 9:00 AM | 08/31/2020 | 3:53 PM | Washington: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2020-09-01 | 1:04 PM | 09/01/2020 | 1:05 PM | California: Los Angeles County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2020-09-03 | 1:46 PM | 09/03/2020 | 10:47 PM | Washington: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| September | 2020-09-04 | 1:07 AM | 09/04/2020 | 1:37 AM | Florida: Pinellas County; | FRCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2020-09-05 | 5:25 PM | 09/05/2020 | 8:55 PM | California: Imperial County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 100 | 20000 | Weather |
| September | 2020-09-05 | 5:20 PM | 09/05/2020 | 8:37 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 986 | Unknown | Weather |
| September | 2020-09-06 | 5:36 PM | 09/06/2020 | 7:27 PM | Washington: Oregon: California: | WECC | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | System Operations | 0 | 0 | Operations |
| September | 2020-09-06 | 4:30 PM | 09/06/2020 | 9:05 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | 1071 | Unknown | Public Appeal |
| September | 2020-09-06 | 5:00 PM | 09/07/2020 | 3:00 AM | California: Los Angeles County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 72000 | Weather |
| September | 2020-09-06 | 4:00 PM | 09/06/2020 | 9:00 PM | Nevada: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 8180 | 1400000 | Weather |
| September | 2020-09-07 | 9:13 AM | 09/08/2020 | 6:00 AM | Washington: | WECC | Complete operational failure or shut-down of the transmission and/or distribution of electrical system. | Natural Disaster | 80 | 21000 | Natural Disaster |
| September | 2020-09-07 | 10:40 PM | 09/09/2020 | 5:24 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Transmission Interruption | 610 | 172000 | Transmission Interruption |
| September | 2020-09-07 | 6:00 PM | 09/08/2020 | 6:00 PM | Washington: Kitsap County, King County, Pierce County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 71500 | Weather |
| September | 2020-09-07 | 7:05 PM | 09/08/2020 | 10:00 PM | Oregon: Multnomah County, Washington County, Clackamas County, Marion County, Yamhill County, Polk County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 2859 | 103000 | Weather |
| September | 2020-09-08 | 9:50 AM | 09/08/2020 | 10:56 AM | Michigan: Ingham County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 265 | 0 | Operations |
| September | 2020-09-09 | 11:22 AM | 09/09/2020 | 1:04 PM | Idaho: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Natural Disaster | 0 | 0 | Natural Disaster |
| September | 2020-09-09 | 10:16 PM | 09/11/2020 | 8:17 AM | Minnesota: Sherburne County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2020-09-15 | 3:04 PM | 09/15/2020 | 3:37 PM | North Dakota: South Dakota: Montana: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2020-09-15 | 10:00 PM | 09/20/2020 | 3:00 PM | Alabama: Florida: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 236 | 34096 | Weather |
| September | 2020-09-16 | 7:00 AM | 09/18/2020 | 6:00 AM | Florida: Escambia County; | FRCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2020-09-16 | 2:09 AM | 09/16/2020 | 2:20 AM | Maine: Oxford County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2020-09-16 | 3:00 AM | 09/21/2020 | 8:00 AM | Alabama: Baldwin County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 0 | 77600 | Weather |
| September | 2020-09-20 | 8:01 PM | 09/21/2020 | 3:44 PM | Oklahoma: Canadian County; | SPP RE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | Unknown | Physical Attack |
| September | 2020-09-22 | 10:02 AM | 09/22/2020 | 12:58 PM | California: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | System Operations | 8 | 4350 | Operations |
| September | 2020-09-23 | 12:00 PM | 09/23/2020 | 1:00 PM | New Jersey: | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2020-09-26 | 5:17 AM | 09/26/2020 | 5:41 AM | Nevada: Clark County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 26 | 13,000 | Physical Attack |
| September | 2020-09-27 | 6:27 PM | 09/28/2020 | 3:17 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Natural Disaster | 337 | 102267 | Natural Disaster |
| September | 2020-09-30 | 5:55 AM | 09/30/2020 | 11:30 PM | Connecticut: Maine: Rhode Island: Massachusetts: New Hampshire: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 155000 | Weather |
| October | 2020-10-02 | 7:30 PM | 10/04/2020 | 6:30 AM | Virginia: Hanover County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2020-10-07 | 1:45 PM | 10/07/2020 | 1:59 PM | Louisiana: Orleans Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 183 | 39089 | Transmission Interruption |
| October | 2020-10-07 | 4:00 PM | Unknown | Unknown | New York: Onondaga County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 7500 | Weather |
| October | 2020-10-07 | 6:50 PM | 10/09/2020 | 3:00 PM | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 186600 | Weather |
| October | 2020-10-09 | 10:44 AM | 10/09/2020 | 10:25 PM | Colorado: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2020-10-09 | 8:00 PM | 10/15/2020 | 7:00 AM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 200 | 50000 | Weather |
| October | 2020-10-09 | 8:00 PM | 10/10/2020 | 6:00 AM | Louisiana: Lafayette Parish; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 50000 | Weather |
| October | 2020-10-09 | 7:50 PM | 10/11/2020 | 3:09 PM | Louisiana: Acadia Parish, Beauregard Parish, Calcasieu Parish, Evangeline Parish, Iberia Parish, Rapides Parish, Vernon Parish, Avoyelles Parish, Grant Parish, Natchitoches Parish, St. Landry Parish, St. Mary Parish, St. Tammany Parish; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 132200 | Weather |
| October | 2020-10-09 | 5:30 PM | 10/10/2020 | 6:00 PM | Louisiana: Texas: Arkansas: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 477966 | Weather |
| October | 2020-10-10 | 8:05 AM | 10/10/2020 | 12:00 PM | Oregon: Clackamas County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2020-10-10 | 11:10 PM | 10/10/2020 | 11:15 PM | Washington: Oregon: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2020-10-10 | 2:22 AM | 10/10/2020 | 5:00 AM | Louisiana: Lafayette Parish; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Severe Weather | Unknown | Unknown | Weather |
| October | 2020-10-12 | 4:06 AM | 10/12/2020 | 4:07 AM | Florida: Polk County; | FRCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2020-10-13 | 1:14 PM | 10/14/2020 | 2:00 PM | Washington: Whatcom County, King County, Pierce County, Thurston County, Kittitas County, Kitsap County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 76000 | Weather |
| October | 2020-10-14 | 6:26 PM | 10/15/2020 | 1:11 PM | Texas: Pecos County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 18 | Unknown | Transmission Interruption |
| October | 2020-10-15 | 4:50 PM | Unknown | Unknown | Michigan: | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2020-10-15 | 11:43 PM | Unknown | Unknown | Washington: Walla Walla County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2020-10-16 | 2:00 PM | 10/16/2020 | 4:00 PM | Kentucky: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 62 | 0 | Physical Attack |
| October | 2020-10-20 | 6:48 PM | 10/20/2020 | 6:49 PM | Illinois: Massac County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| October | 2020-10-22 | 10:48 PM | 10/22/2020 | 11:34 PM | Florida: Pinellas County; | FRCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2020-10-22 | 8:00 AM | 10/22/2020 | 8:01 AM | Idaho: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2020-10-23 | 3:42 PM | 10/23/2020 | 11:11 PM | Ohio: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| October | 2020-10-23 | 3:46 PM | 10/23/2020 | 11:03 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55506 | Weather |
| October | 2020-10-24 | 8:13 PM | 10/24/2020 | 10:52 PM | Minnesota: Hennepin County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 1 | 4 | Transmission Interruption |
| October | 2020-10-25 | 3:25 AM | 10/25/2020 | 3:45 AM | Wisconsin: Milwaukee County; Michigan: | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2020-10-25 | 2:32 PM | 10/27/2020 | 6:00 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 1218 | 370000 | Weather |
| October | 2020-10-26 | 10:00 AM | 10/26/2020 | 10:15 AM | Kentucky: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 64 | 0 | Physical Attack |
| October | 2020-10-26 | 9:28 AM | 10/26/2020 | 12:20 PM | Colorado: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 75 | 13000 | Transmission Interruption |
| October | 2020-10-26 | 11:24 AM | 10/27/2020 | 4:43 PM | California: Los Angeles County, Riverside County, San Bernardino County, Orange County, Kern County, Ventura County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 136833 | Weather |
| October | 2020-10-26 | 1:00 PM | 11/07/2020 | 7:00 PM | Oklahoma: Oklahoma County, Canadian County, Logan County, Cleveland County, Pottawatomie County; | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 447000 | Weather |
| October | 2020-10-27 | 5:50 PM | Unknown | Unknown | Oklahoma: | SPP RE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 235000 | Weather |
| October | 2020-10-28 | 11:53 AM | 10/28/2020 | 3:26 PM | Texas: | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| October | 2020-10-28 | 9:37 PM | 11/02/2020 | 7:30 PM | Alabama: Florida: Mississippi: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 253 | 35478 | Weather |
| October | 2020-10-28 | 5:12 PM | 10/29/2020 | 4:30 PM | Louisiana: St. Tammany Parish, St. Mary Parish; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 72707 | Weather |
| October | 2020-10-28 | 6:00 PM | 10/29/2020 | 1:15 AM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 481268 | Weather |
| October | 2020-10-28 | 10:28 AM | 10/28/2020 | 10:29 AM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | Unknown | Unknown | Weather |
| October | 2020-10-29 | 11:58 AM | 10/29/2020 | 1:10 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2020-10-29 | 2:00 AM | 10/31/2020 | 9:00 AM | Alabama: Baldwin County, Butler County, Clarke County, Conecuh County, Escambia County, Lee County, Lowndes County, Macon County, Montgomery County, Pike County, Russell County, Tallapoosa County, Talladega County, Washington County, Monroe County; Florida: Escambia County, Okaloosa County, Walton County, Santa Rosa County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 0 | 90000 | Weather |
| October | 2020-10-29 | 8:15 AM | 10/31/2020 | 6:45 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 461580 | Weather |
| November | 2020-11-01 | 12:31 PM | 11/01/2020 | 12:35 PM | California: Placer County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2020-11-01 | 6:00 PM | 11/01/2020 | 6:09 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 85677 | Weather |
| November | 2020-11-02 | 11:12 AM | 11/02/2020 | 11:21 AM | Florida: | FRCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2020-11-07 | 5:40 PM | 11/07/2020 | 10:10 PM | Colorado: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2020-11-09 | 12:00 PM | 11/10/2020 | 9:45 AM | New Hampshire: Coos County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2020-11-10 | 10:42 AM | 11/10/2020 | 12:45 PM | Arizona: Maricopa County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2020-11-13 | 12:20 AM | 11/13/2020 | 8:00 AM | Washington: Snohomish County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | System Operations | 0 | 0 | Operations |
| November | 2020-11-14 | 7:40 AM | Unknown | Unknown | California: San Bernardino County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| November | 2020-11-15 | 3:37 PM | 11/17/2020 | 12:15 PM | Michigan: Iosco County, Oscoda County, Ogemaw County, Livingston County, Ionia County, Barry County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 57327 | Weather |
| November | 2020-11-15 | 11:05 PM | 11/16/2020 | 5:00 AM | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 62408 | Weather |
| November | 2020-11-15 | 11:30 AM | 11/16/2020 | 3:25 AM | Ohio: West Virginia: Virginia: Indiana: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 75000 | Weather |
| November | 2020-11-15 | 2:52 PM | 11/16/2020 | 5:59 AM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 96809 | Weather |
| November | 2020-11-15 | 3:08 PM | 11/15/2020 | 10:30 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 123361 | Weather |
| November | 2020-11-15 | 12:30 PM | 11/18/2020 | 9:44 AM | Michigan: Huron County, Livingston County, Macomb County, Monroe County, Wayne County, Washtenaw County, Tuscola County, St. Clair County, Lapeer County, Oakland County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 150000 | Weather |
| November | 2020-11-18 | 8:30 AM | 11/18/2020 | 10:50 AM | Missouri: Jackson County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2020-11-18 | 10:20 AM | 11/18/2020 | 11:18 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2020-11-20 | 9:10 AM | 11/20/2020 | 9:22 AM | Texas: Kentucky: Arizona: New Mexico: Oregon: Washington: | TRE | Cyber event that causes interruptions of electrical system operations. | System Operations | 0 | Unknown | Cyber Attack |
| November | 2020-11-21 | 11:59 AM | 11/21/2020 | 12:59 PM | Nevada: Clark County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 21 | 577 | Physical Attack |
| November | 2020-11-23 | 5:50 AM | 11/23/2020 | 7:27 AM | Wisconsin: Dane County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2020-11-30 | 2:33 PM | 11/30/2020 | 5:20 PM | Texas: El Paso County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2020-11-30 | 4:24 PM | 12/01/2020 | 2:25 PM | Massachusetts: Maine: Connecticut: Rhode Island: Vermont: New Hampshire: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 116000 | Weather |
| December | 2020-12-01 | 12:32 PM | 12/01/2020 | 10:50 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 170190 | Weather |
| December | 2020-12-03 | 9:01 AM | 12/03/2020 | 9:03 AM | Colorado: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 89 | 0 | Transmission Interruption |
| December | 2020-12-03 | 10:57 AM | 12/04/2020 | 3:02 PM | California: Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, San Diego County, Tulare County, Ventura County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 132 | 51686 | Weather |
| December | 2020-12-03 | 12:44 AM | 12/05/2020 | 11:03 AM | California: San Diego County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 93 | 73000 | Weather |
| December | 2020-12-05 | 4:40 PM | Unknown | Unknown | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 271231 | Weather |
| December | 2020-12-06 | 9:45 AM | 12/06/2020 | 5:00 PM | Pennsylvania: | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-07 | 6:10 PM | 12/08/2020 | 9:09 PM | California: Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Ventura County, Tulare County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 286 | 76234 | Weather |
| December | 2020-12-08 | 9:43 AM | 12/08/2020 | 10:33 AM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-09 | 1:20 PM | 12/09/2020 | 2:30 PM | Missouri: Kansas: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-10 | 4:30 PM | 12/12/2020 | 5:00 AM | Washington: King County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-11 | 10:51 PM | 12/11/2020 | 11:57 PM | Texas: Harris County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-13 | 6:47 AM | 12/13/2020 | 7:36 AM | California: | WECC | Uncontrolled loss of 200 Megawatts or more of firm system loads for 15 minutes or more from a single incident for entities with previous year's peak demand less than or equal to 3,000 Megawatts. | System Operations | 298 | 159239 | Operations |
| December | 2020-12-14 | 11:00 AM | Unknown | Unknown | Idaho: Oregon: | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | 0 | 0 | Cyber Attack |
| December | 2020-12-14 | 1:30 AM | Unknown | Unknown | New Jersey: Pennsylvania: Maryland: Illinois: Delaware: District of Columbia: | RF | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | 0 | 0 | Cyber Attack |
| December | 2020-12-14 | 5:01 PM | 12/14/2020 | 5:34 PM | California: | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-16 | 11:20 PM | 12/17/2020 | 7:20 AM | Oklahoma: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| December | 2020-12-17 | 4:19 PM | 12/17/2020 | 4:57 PM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2020-12-17 | 8:07 AM | 12/17/2020 | 8:32 AM | California: | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 35 | 17000 | Weather |
| December | 2020-12-18 | 6:34 AM | 12/18/2020 | 9:51 AM | Oregon: Clackamas County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2020-12-20 | 5:06 AM | 12/20/2020 | 5:22 AM | California: Los Angeles County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | 0 | 0 | Cyber Attack |
| December | 2020-12-22 | 2:20 AM | 12/22/2020 | 2:21 AM | Washington: Pierce County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 2,000 | Physical Attack |
| December | 2020-12-24 | 11:40 PM | Unknown | Unknown | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 68114 | Weather |
| December | 2020-12-25 | 3:51 AM | 12/25/2020 | 3:52 AM | California: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2020-12-25 | 6:51 PM | 12/25/2020 | 7:24 PM | Ohio: Kentucky: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2020-12-25 | 7:55 AM | 12/25/2020 | 4:45 PM | Connecticut: Maine: New Hampshire: Massachusetts: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 19000 | Weather |
| December | 2020-12-28 | 5:31 PM | 12/29/2020 | 1:31 PM | Virginia: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2021-01-01 | 7:04 AM | 01/01/2021 | 7:05 AM | California: Alameda County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| January | 2021-01-02 | 10:28 AM | 01/02/2021 | 10:29 AM | California: Butte County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | System Operations | 8 | 5803 | Operations |
| January | 2021-01-04 | 10:34 AM | 01/04/2021 | 10:49 AM | Pennsylvania: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 6 | 3825 | Transmission Interruption |
| January | 2021-01-08 | 1:26 AM | 01/08/2021 | 2:45 AM | Arkansas: Prairie County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Sabotage | Unknown | 1,908 | Physical Attack |
| January | 2021-01-10 | 10:44 PM | 01/13/2021 | 4:00 PM | Texas: Anderson County, Angelina County, Dallas County, Freestone County, Henderson County, Houston County, Leon County, Nacogdoches County, Smith County, Tarrant County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 188000 | Weather |
| January | 2021-01-11 | 5:00 AM | 01/11/2021 | 2:22 PM | Louisiana: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | Unknown | 58000 | Weather |
| January | 2021-01-12 | 8:30 PM | Unknown | Unknown | Washington: Snohomish County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Transmission Interruption | 200 | 62000 | Weather |
| January | 2021-01-12 | 11:49 PM | 01/14/2021 | 2:00 PM | Washington: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather/Distribution Interruption | 150 | 70000 | Weather |
| January | 2021-01-12 | 8:46 PM | 01/13/2021 | 4:00 PM | Oregon: Clackamas County, Multnomah County, Washington County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 94231 | Weather |
| January | 2021-01-12 | 11:50 PM | 01/15/2021 | 1:00 PM | Washington: Kitsap County, Thurston County, King County, Pierce County, Skagit County, Whatcom County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 100 | 320000 | Weather |
| January | 2021-01-13 | 1:05 PM | 01/13/2021 | 1:06 PM | Georgia: Houston County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2021-01-13 | 3:43 AM | 01/13/2021 | 4:00 PM | Washington: Idaho: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 185 | 70417 | Weather |
| January | 2021-01-15 | 5:48 PM | 01/15/2021 | 6:55 PM | Missouri: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2021-01-18 | 2:07 PM | 01/18/2021 | 2:42 PM | Connecticut: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2021-01-19 | 2:48 AM | 01/20/2021 | 11:41 AM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 411 | 124888 | Weather |
| January | 2021-01-19 | 9:31 AM | 01/21/2021 | 2:36 PM | California: Kern County, Los Angeles County, Riverside County, San Bernardino County, Ventura County, Orange County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 173746 | Weather |
| January | 2021-01-21 | 12:00 AM | 02/03/2021 | 4:55 PM | Texas: Louisiana: Arkansas: Pulaski County; Mississippi: | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2021-01-23 | 7:00 AM | 01/27/2021 | 1:45 PM | Georgia: Laurens County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Cyber Event | 29 | Unknown | Cyber Attack |
| January | 2021-01-23 | 7:45 AM | 01/23/2021 | 8:00 AM | California: Placer County, Nevada County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 45 | 0 | Physical Attack |
| January | 2021-01-26 | 8:49 PM | 01/28/2021 | 9:14 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 841 | 255715 | Weather |
| January | 2021-01-27 | 12:30 PM | 01/27/2021 | 4:18 PM | New Hampshire: Hillsborough County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2021-01-28 | 10:15 AM | 01/28/2021 | 4:46 PM | New Hampshire: Hillsborough County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2021-02-01 | 11:25 PM | 02/02/2021 | 1:12 AM | Texas: Kleberg County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 13 | 6102 | Transmission Interruption |
| February | 2021-02-02 | 9:25 AM | 02/03/2021 | 11:38 AM | South Dakota: Hughes County; | MRO | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather/Transmission Interruption | 5 | 3 | Weather |
| February | 2021-02-02 | 12:34 PM | 02/02/2021 | 3:43 PM | South Dakota: Hughes County; | MRO | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather/Transmission Interruption | 5 | 4 | Weather |
| February | 2021-02-03 | 2:22 PM | 02/04/2021 | 10:32 PM | North Dakota: Logan County, Emmons County, McIntosh County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 7 | 1400 | Transmission Interruption |
| February | 2021-02-05 | 9:43 AM | 02/05/2021 | 11:19 AM | Arkansas: Arkansas County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2021-02-06 | 6:50 AM | 02/06/2021 | 2:43 PM | Ohio: Kentucky: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2021-02-07 | 6:57 AM | 02/07/2021 | 7:34 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2021-02-08 | 6:19 PM | 02/08/2021 | 6:29 PM | New Hampshire: Hillsborough County; | NPCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-08 | 7:04 AM | 02/08/2021 | 2:10 PM | Minnesota: St. Louis County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2021-02-09 | 1:00 PM | 02/10/2021 | 2:21 PM | Oregon: Tillamook County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2021-02-09 | 10:51 AM | Unknown | Unknown | North Carolina: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2021-02-10 | 3:00 PM | 02/23/2021 | 3:00 PM | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 2000000 | Weather |
| February | 2021-02-11 | 1:00 PM | Unknown | Unknown | Kansas: | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| February | 2021-02-11 | 8:30 AM | 02/22/2021 | 9:00 AM | Illinois: Scott County; | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| February | 2021-02-11 | 7:21 PM | 02/11/2021 | 9:20 PM | Colorado: Morgan County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2021-02-12 | 3:30 PM | 02/22/2021 | 7:30 AM | Texas: | TRE | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| February | 2021-02-12 | 9:00 PM | 02/20/2021 | 5:15 PM | Oregon: Clackamas County, Marion County, Polk County, Multnomah County, Washington County, Yamhill County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 300187 | Weather |
| February | 2021-02-13 | 9:56 AM | 02/13/2021 | 11:01 AM | Washington: Lewis County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 164 | 37583 | Weather |
| February | 2021-02-13 | 1:30 PM | 02/19/2021 | 9:00 PM | West Virginia: Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 55097 | Weather |
| February | 2021-02-13 | 8:32 AM | 02/14/2021 | 3:00 PM | South Carolina: North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 129000 | Weather |
| February | 2021-02-13 | 1:30 PM | 02/20/2021 | 8:00 AM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-14 | 8:32 PM | Unknown | Unknown | Nebraska: Lancaster County; | MRO | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | 0 | Weather |
| February | 2021-02-14 | 6:00 PM | 02/16/2021 | 10:00 PM | Missouri: Jasper County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | 0 | Weather |
| February | 2021-02-14 | 8:21 PM | 02/18/2021 | 9:30 AM | Arkansas: Louisiana: Texas: Oklahoma: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 461 | 125484 | Weather |
| February | 2021-02-14 | 8:30 AM | 02/19/2021 | 6:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 7214 | Unknown | Weather |
| February | 2021-02-14 | 8:30 AM | 02/19/2021 | 6:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-14 | 5:30 AM | 02/18/2021 | 10:00 AM | Oklahoma: | MRO | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-14 | 8:00 PM | 02/18/2021 | 9:28 AM | North Dakota: South Dakota: Nebraska: Kansas: Oklahoma: Texas: | MRO | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 3000 | Unknown | Weather |
| February | 2021-02-14 | 7:05 PM | Unknown | Unknown | Missouri: Kansas: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 7:00 AM | 02/18/2021 | 9:00 AM | Oklahoma: | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| February | 2021-02-15 | 7:48 PM | 02/18/2021 | 10:30 AM | Oklahoma: Kay County; | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | Unknown | Fuel Supply Deficiency |
| February | 2021-02-15 | 2:00 PM | 02/15/2021 | 6:00 PM | Louisiana: | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| February | 2021-02-15 | 10:00 AM | Unknown | Unknown | Nebraska: Lancaster County; | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 613 | Unknown | Fuel Supply Deficiency |
| February | 2021-02-15 | 4:00 PM | 02/15/2021 | 6:34 PM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-15 | 6:00 PM | 02/15/2021 | 11:59 PM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Operations |
| February | 2021-02-15 | 9:10 AM | Unknown | Unknown | Texas: Randall County; | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | 0 | Weather |
| February | 2021-02-15 | 7:52 AM | 02/17/2021 | 2:15 PM | Texas: Austin County, Bastrop County, Burleson County, Caldwell County, Colorado County, Fayette County, Gonzales County, Guadalupe County, Hays County, Lee County, Milam County, Travis County, Washington County, Williamson County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 107 | 25000 | Weather |
| February | 2021-02-15 | 10:24 AM | 02/18/2021 | 9:52 AM | Texas: Lubbock County; | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 116 | 29942 | Weather |
| February | 2021-02-15 | 1:20 AM | Unknown | Unknown | Texas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 360 | 72000 | Weather |
| February | 2021-02-15 | 3:06 AM | Unknown | Unknown | Texas: Bexar County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 154000 | Weather |
| February | 2021-02-15 | 1:00 PM | 02/20/2021 | 10:00 AM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | 175000 | Weather |
| February | 2021-02-15 | 6:51 AM | 02/16/2021 | 1:19 PM | Oklahoma: | MRO | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 350 | 200000 | Weather |
| February | 2021-02-15 | 2:51 AM | 02/19/2021 | 9:00 AM | Texas: Travis County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 219306 | Weather |
| February | 2021-02-15 | 1:20 AM | 02/18/2021 | 12:02 AM | Texas: Harris County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 4966 | 1390000 | Weather |
| February | 2021-02-15 | 1:20 AM | 02/18/2021 | 12:42 AM | Texas: Hidalgo County, Cameron County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 12:00 AM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 500 | Unknown | Weather |
| February | 2021-02-15 | 5:36 AM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 300 | Unknown | Weather |
| February | 2021-02-15 | 1:54 AM | 02/17/2021 | 11:56 PM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 524 | Unknown | Weather |
| February | 2021-02-15 | 1:20 AM | 02/19/2021 | 9:00 AM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 7214 | Unknown | Weather |
| February | 2021-02-15 | 3:00 PM | 02/19/2021 | 10:00 AM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 1:54 AM | 02/19/2021 | 9:00 AM | Texas: Travis County; | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 724 | Unknown | Weather |
| February | 2021-02-15 | 5:27 AM | 02/18/2021 | 8:18 AM | Texas: | TRE | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 1:23 AM | 02/19/2021 | 5:30 AM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 8:50 AM | 02/18/2021 | 9:30 AM | Kansas: | MRO | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 6:00 PM | 02/15/2021 | 11:55 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 5:40 AM | 02/16/2021 | 1:11 PM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 800 | Unknown | Weather |
| February | 2021-02-15 | 6:45 AM | Unknown | Unknown | Texas: Arkansas: | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 5:00 AM | 02/17/2021 | 4:00 PM | Arkansas: Pulaski County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 5:00 PM | 02/15/2021 | 10:59 PM | Mississippi: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 6:00 PM | 02/15/2021 | 11:59 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 12:18 PM | 02/15/2021 | 1:22 PM | Missouri: Kansas: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-15 | 5:36 AM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 300 | Unknown | Weather |
| February | 2021-02-15 | 12:00 AM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 500 | Unknown | Weather |
| February | 2021-02-16 | 7:00 AM | Unknown | Unknown | New Jersey: Pennsylvania: Texas: California: Illinois: Colorado: | RF | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | Unknown | 0 | Cyber Attack |
| February | 2021-02-16 | 6:35 PM | 02/17/2021 | 1:00 AM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| February | 2021-02-16 | 6:24 AM | 02/16/2021 | 10:41 AM | Louisiana: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 100 | 18150 | Load Shed |
| February | 2021-02-16 | 5:45 PM | 02/16/2021 | 7:15 PM | Texas: Travis County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-16 | 11:28 PM | Unknown | Unknown | Texas: | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-16 | 10:20 AM | 02/16/2021 | 1:20 PM | Oregon: Multnomah County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-16 | 6:35 PM | 02/17/2021 | 1:00 AM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Public Appeal |
| February | 2021-02-16 | 6:19 PM | Unknown | Unknown | Arkansas: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| February | 2021-02-16 | 9:31 AM | 02/16/2021 | 10:27 AM | Nebraska: Custer County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 31 | Unknown | Transmission Interruption |
| February | 2021-02-16 | 1:00 AM | 02/16/2021 | 9:28 PM | Kentucky: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 54167 | Weather |
| February | 2021-02-16 | 7:20 AM | 02/16/2021 | 10:02 AM | Nebraska: Douglas County, Burt County, Washington County, Dodge County, Colfax County, Saunders County, Sarpy County, Cass County, Otoe County, Johnson County, Nemaha County, Pawnee County, Richardson County; | MRO | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 126 | 81100 | Weather |
| February | 2021-02-16 | 7:03 AM | 02/20/2021 | 10:00 PM | Kansas: Missouri: | MRO | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | 222000 | Weather |
| February | 2021-02-16 | 7:17 AM | 02/16/2021 | 10:08 AM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 168 | 840000 | Weather |
| February | 2021-02-16 | 6:48 AM | Unknown | Unknown | Louisiana: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 360 | Unknown | Weather |
| February | 2021-02-16 | 4:40 PM | 02/20/2021 | 12:00 AM | Missouri: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-16 | 5:35 PM | 02/17/2021 | 12:00 AM | Mississippi: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-16 | 5:30 AM | 02/16/2021 | 2:00 PM | Louisiana: Texas: Illinois: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 1420 | Unknown | Weather |
| February | 2021-02-16 | 7:43 PM | 02/16/2021 | 9:41 PM | Louisiana: Arkansas: Texas: Mississippi: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 700 | Unknown | Weather |
| February | 2021-02-16 | 7:40 PM | 02/17/2021 | 1:00 AM | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 538 | Unknown | Weather |
| February | 2021-02-16 | 5:35 PM | 02/17/2021 | 12:00 AM | Louisiana: Lafayette Parish; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-16 | 6:10 AM | Unknown | Unknown | Missouri: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather/Transmission Interruption | 130 | Unknown | Weather |
| February | 2021-02-16 | 7:22 AM | 02/16/2021 | 8:00 AM | Louisiana: Allen Parish, St. Landry Parish, Evangeline Parish; | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 153 | Unknown | Weather |
| February | 2021-02-16 | 6:48 AM | Unknown | Unknown | Louisiana: Texas: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 402 | Unknown | Weather |
| February | 2021-02-16 | 4:26 AM | Unknown | Unknown | Texas: | TRE | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 300 | Unknown | Weather |
| February | 2021-02-17 | 9:00 AM | 02/19/2021 | 9:00 AM | Kansas: | MRO | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| February | 2021-02-17 | 6:38 AM | 02/17/2021 | 8:37 AM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-17 | 6:00 PM | 02/17/2021 | 11:00 PM | Louisiana: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Public Appeal |
| February | 2021-02-17 | 5:00 PM | 02/17/2021 | 10:00 PM | Mississippi: | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Public Appeal |
| February | 2021-02-17 | 10:30 AM | 02/17/2021 | 6:04 PM | North Carolina: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2021-02-17 | 5:00 PM | 02/17/2021 | 10:00 PM | Louisiana: Lafayette Parish; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 400 | 67000 | Weather |
| February | 2021-02-17 | 6:00 PM | 02/17/2021 | 11:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | Unknown | Unknown | Weather |
| February | 2021-02-19 | 9:00 PM | 02/20/2021 | 1:00 PM | Texas: | TRE | Cyber event that causes interruptions of electrical system operations. | Cyber Event | Unknown | 0 | Cyber Attack |
| February | 2021-02-19 | 12:01 PM | 02/19/2021 | 12:41 PM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2021-02-19 | 6:48 AM | Unknown | Unknown | Louisiana: Texas: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 402 | Unknown | Weather |
| February | 2021-02-27 | 6:02 AM | 02/27/2021 | 9:51 AM | Oregon: Multnomah County, Clackamas County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | Unknown | 0 | Operations |
| February | 2021-02-28 | 12:42 PM | 02/28/2021 | 1:22 PM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2021-03-01 | 10:06 AM | 03/09/2021 | 12:00 PM | New York: Greene County; | NPCC | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | 0 | 0 | Cyber Attack |
| March | 2021-03-01 | 1:06 PM | 03/01/2021 | 1:07 PM | Texas: Nueces County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2021-03-01 | 10:45 PM | 03/02/2021 | 6:35 PM | Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 69260 | Weather |
| March | 2021-03-02 | 1:03 PM | 03/02/2021 | 1:38 PM | Kentucky: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2021-03-05 | 2:30 PM | 03/05/2021 | 3:00 PM | Indiana: Hamilton County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2021-03-06 | 3:21 AM | 03/06/2021 | 4:07 AM | California: Tuolumne County; | WECC | Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 22 | 24000 | Weather |
| March | 2021-03-08 | 4:36 AM | 03/08/2021 | 4:37 AM | Washington: Yakima County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2021-03-08 | 8:54 AM | 03/08/2021 | 8:55 AM | Oregon: Multnomah County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2021-03-11 | 8:10 AM | 03/11/2021 | 1:00 PM | Washington: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2021-03-17 | 6:27 AM | 03/17/2021 | 8:27 AM | Pennsylvania: | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 43 | 7381 | Transmission Interruption |
| March | 2021-03-17 | 6:15 AM | 03/18/2021 | 12:00 PM | Texas: Dallas County, Tarrant County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 148000 | Weather |
| March | 2021-03-18 | 9:08 PM | 03/19/2021 | 10:31 PM | Washington: Okanogan County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 4 | 916 | Physical Attack |
| March | 2021-03-19 | 8:59 AM | 03/19/2021 | 10:04 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2021-03-19 | 7:11 PM | 03/19/2021 | 7:59 PM | New Jersey: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| March | 2021-03-19 | 10:30 AM | 03/19/2021 | 12:00 PM | Louisiana: Lafourche Parish; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 4,200 | Physical Attack |
| March | 2021-03-21 | 4:01 AM | 03/22/2021 | 9:37 AM | Minnesota: Hennepin County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2021-03-29 | 10:30 AM | Unknown | Unknown | New Mexico: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| March | 2021-03-29 | 11:06 AM | Unknown | Unknown | Connecticut: Massachusetts: Maine: Vermont: Rhode Island: New Hampshire: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 70000 | Weather |
| March | 2021-03-30 | 4:18 PM | 03/30/2021 | 8:21 PM | Texas: Hidalgo County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2021-04-06 | 8:49 AM | 04/06/2021 | 8:50 AM | Florida: Alachua County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| April | 2021-04-07 | 10:18 AM | 04/07/2021 | 11:20 AM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2021-04-07 | 5:42 PM | 04/07/2021 | 10:09 PM | Ohio: Lake County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2021-04-08 | 4:51 AM | 04/10/2021 | 8:00 PM | California: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2021-04-09 | 1:20 PM | 04/10/2021 | 12:40 AM | Texas: Denton County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2021-04-12 | 12:44 AM | 04/12/2021 | 5:45 PM | Colorado: Larimer County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| April | 2021-04-13 | 12:37 AM | 04/13/2021 | 4:19 AM | Wisconsin: Eau Claire County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2021-04-13 | 9:00 AM | 04/13/2021 | 10:00 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2021-04-13 | 4:49 PM | 04/13/2021 | 8:30 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | 0 | Weather |
| April | 2021-04-14 | 10:19 AM | 04/14/2021 | 11:39 AM | District of Columbia: Delaware: Maryland: New Jersey: Pennsylvania: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2021-04-21 | 1:13 PM | 04/21/2021 | 2:10 PM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2021-04-21 | 8:31 PM | 04/21/2021 | 9:35 PM | Minnesota: Dakota County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| April | 2021-04-22 | 5:15 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| April | 2021-04-22 | 4:43 PM | 04/22/2021 | 5:14 PM | Wisconsin: Dane County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2021-04-24 | 10:08 PM | 04/24/2021 | 11:41 PM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2021-04-24 | 9:00 PM | 04/25/2021 | 10:43 AM | Alabama: Calhoun County; Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 137 | 18860 | Weather |
| April | 2021-04-25 | 8:20 AM | Unknown | Unknown | Tennessee: Davidson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| April | 2021-04-26 | 11:18 AM | 04/26/2021 | 1:00 PM | Maine: Kennebec County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-02 | 7:58 PM | 05/02/2021 | 8:22 PM | New Hampshire: Hillsborough County; | NPCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-03 | 11:21 AM | 05/03/2021 | 11:53 AM | Oklahoma: Oklahoma County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-03 | 7:52 AM | 05/03/2021 | 7:53 AM | South Carolina: Cherokee County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2021-05-04 | 6:06 PM | 05/05/2021 | 5:48 PM | Mississippi: Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 175 | 24457 | Weather |
| May | 2021-05-04 | 3:45 PM | 05/05/2021 | 10:00 AM | Arkansas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 104027 | Weather |
| May | 2021-05-05 | 11:50 AM | 05/08/2021 | 11:50 AM | Michigan: Huron County; | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-06 | 5:00 PM | 05/06/2021 | 5:15 PM | Missouri: Jasper County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | 0 | 0 | Operations |
| May | 2021-05-10 | 2:28 AM | 05/10/2021 | 3:21 AM | Pennsylvania: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-10 | 12:17 PM | 05/10/2021 | 12:54 PM | Indiana: Vanderburgh County, Warrick County, Posey County, Daviess County, Gibson County, Knox County, Spencer County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-11 | 9:32 AM | 05/11/2021 | 10:38 AM | Wisconsin: Iowa: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-11 | 11:01 PM | 05/12/2021 | 8:29 AM | Texas: Kinney County; | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-14 | 10:00 PM | 05/17/2021 | 6:00 AM | Idaho: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-14 | 8:30 AM | 05/14/2021 | 4:00 PM | Pennsylvania: Montgomery County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2021-05-18 | 12:15 PM | 05/18/2021 | 8:18 PM | Delaware: New Castle County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-18 | 11:25 PM | 05/19/2021 | 8:30 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 125000 | Weather |
| May | 2021-05-20 | 7:25 AM | 05/20/2021 | 7:26 AM | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-20 | 10:06 AM | 05/20/2021 | 1:45 PM | Florida: Brevard County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 35000 | Transmission Interruption |
| May | 2021-05-24 | 1:14 PM | 05/24/2021 | 1:15 PM | Utah: San Juan County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| May | 2021-05-25 | 12:56 PM | 05/25/2021 | 1:41 PM | Ohio: | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-27 | 12:05 AM | 05/27/2021 | 12:45 AM | Oregon: Multnomah County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-27 | 6:51 PM | 05/28/2021 | 3:56 PM | California: Nevada: | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| May | 2021-05-28 | 10:13 PM | 05/28/2021 | 11:34 PM | Minnesota: St. Louis County; | MRO | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2021-05-28 | 8:00 PM | 05/28/2021 | 9:29 PM | California: Riverside County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 0 | 655 | Physical Attack |
| May | 2021-05-28 | 9:24 PM | 05/28/2021 | 9:25 PM | Florida: Duval County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 1850 | 10000 | Transmission Interruption |
| June | 2021-06-06 | 2:57 PM | 06/06/2021 | 4:00 PM | Indiana: Clay County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | 0 | Transmission Interruption |
| June | 2021-06-07 | 1:26 PM | 06/07/2021 | 1:27 PM | Texas: Somervell County, Ellis County; | TRE | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | Generation Inadequacy | 1435 | 0 | Generation Interruption |
| June | 2021-06-07 | 3:19 PM | 06/07/2021 | 6:22 PM | New Mexico: San Juan County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2021-06-07 | 10:27 PM | 06/08/2021 | 12:33 AM | Minnesota: North Dakota: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 23 | 1 | Weather |
| June | 2021-06-08 | 3:00 PM | 06/08/2021 | 3:01 PM | Texas: Liberty County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2021-06-09 | 7:09 PM | 06/09/2021 | 8:50 PM | New Mexico: San Juan County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2021-06-10 | 10:28 PM | 06/10/2021 | 11:07 PM | Kansas: Wyandotte County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 90 | 9800 | Transmission Interruption |
| June | 2021-06-11 | 3:26 AM | 06/11/2021 | 3:48 AM | South Dakota: Brown County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 0 | 0 | Weather |
| June | 2021-06-14 | 2:10 AM | 06/14/2021 | 2:11 AM | Utah: Salt Lake County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2021-06-14 | 12:55 PM | 06/18/2021 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Public Appeal |
| June | 2021-06-14 | 12:15 PM | 06/18/2021 | 7:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | System Operations | Unknown | Unknown | Public Appeal |
| June | 2021-06-15 | 11:55 AM | 06/15/2021 | 9:17 PM | Texas: | TRE | Cyber event that could potentially impact electric power system adequacy or reliability. | Cyber Event | Unknown | Unknown | Cyber Attack |
| June | 2021-06-15 | 11:30 AM | 06/15/2021 | 1:35 PM | Kansas: Wyandotte County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2021-06-16 | 4:10 AM | 06/16/2021 | 6:39 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2021-06-16 | 10:25 AM | 06/16/2021 | 3:16 PM | Florida: Alachua County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| June | 2021-06-16 | 10:40 AM | 06/16/2021 | 10:43 AM | Louisiana: West Baton Rouge Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 7 | 1841 | Transmission Interruption |
| June | 2021-06-19 | 6:54 PM | 06/19/2021 | 9:01 PM | California: Alameda County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | System Operations | 93 | 51806 | Operations |
| June | 2021-06-21 | 3:50 PM | 06/21/2021 | 4:50 PM | Arkansas: Benton County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2021-06-21 | 5:14 AM | 06/21/2021 | 7:00 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 151852 | Weather |
| June | 2021-06-23 | 3:47 PM | 06/23/2021 | 4:44 PM | Missouri: Boone County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2021-06-24 | 7:07 AM | 06/24/2021 | 1:48 PM | Washington: Kittitas County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2021-06-24 | 3:34 AM | 06/24/2021 | 5:07 AM | California: Plumas County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Transmission Interruption | 36 | 7621 | Transmission Interruption |
| June | 2021-06-27 | 2:27 AM | 06/27/2021 | 3:30 AM | New York: Jefferson County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 982 | Physical Attack |
| June | 2021-06-27 | 8:10 PM | 06/27/2021 | 9:30 PM | North Dakota: Morton County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 4 | 1,003 | Physical Attack |
| June | 2021-06-28 | 11:22 AM | Unknown | Unknown | North Carolina: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| June | 2021-06-28 | 1:20 PM | Unknown | Unknown | Washington: Spokane County, Stevens County, Lincoln County, Adams County, Whitman County; Idaho: Kootenai County, Bonner County, Shoshone County, Boundary County, Benewah County, Latah County, Nez Perce County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 44 | Unknown | Weather |
| June | 2021-06-29 | 4:00 PM | Unknown | Unknown | Michigan: Oakland County, Macomb County, Wayne County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 53000 | Weather |
| June | 2021-06-30 | 6:50 PM | Unknown | Unknown | Connecticut: Massachusetts: Rhode Island: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 53103 | Weather |
| July | 2021-07-03 | 11:08 PM | 07/04/2021 | 2:16 AM | New Mexico: Bernalillo County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. - 17. Facility Physical Threat | Vandalism | 45 | 34509 | Physical Attack |
| July | 2021-07-04 | 3:33 PM | 07/04/2021 | 8:32 PM | Washington: Chelan County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Natural Disaster | 0 | 0 | Natural Disaster |
| July | 2021-07-05 | 5:32 AM | 07/05/2021 | 8:58 AM | New York: | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2021-07-05 | 2:04 PM | 07/05/2021 | 2:41 PM | Ohio: Kentucky: | RF/SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2021-07-06 | 12:02 AM | 07/07/2021 | 12:20 AM | Florida: Polk County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 450 | 0 | Transmission Interruption |
| July | 2021-07-06 | 7:41 PM | 07/06/2021 | 9:50 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmisison Interruption | Unknown | 136827 | Weather |
| July | 2021-07-07 | 3:30 PM | Unknown | Unknown | Michigan: Macomb County, Oakland County, Monroe County, Livingston County, St. Clair County, Washtenaw County, Wayne County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 90000 | Weather |
| July | 2021-07-08 | 5:01 PM | 07/08/2021 | 5:24 PM | New York: | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmisison Interruption | 0 | 0 | Weather |
| July | 2021-07-08 | 8:29 PM | 07/08/2021 | 8:33 PM | North Dakota: Stark County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmisison Interruption | 88 | 0 | Weather |
| July | 2021-07-09 | 5:44 PM | 07/09/2021 | 9:05 PM | California: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Fuel Supply Deficiency | 810 | Unknown | Fuel Supply Deficiency |
| July | 2021-07-09 | 8:25 PM | 07/10/2021 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 230 | 47000 | Weather |
| July | 2021-07-10 | 6:00 PM | 07/10/2021 | 9:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Transmission Interruption | 9000 | 1300000 | Public Appeal |
| July | 2021-07-10 | 12:30 AM | 07/10/2021 | 5:00 AM | Nebraska: Missouri: | MRO/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmisison Interruption | Unknown | 211500 | Weather |
| July | 2021-07-10 | 12:00 AM | 07/11/2021 | 4:00 PM | Nebraska: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 188000 | Weather |
| July | 2021-07-10 | 1:55 AM | 07/10/2021 | 1:56 AM | Missouri: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 52000 | Weather |
| July | 2021-07-10 | 12:30 AM | 07/10/2021 | 5:00 AM | Missouri: Nebraska: | MRO/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmisison Interruption | Unknown | 212500 | Weather |
| July | 2021-07-11 | 6:00 PM | 07/11/2021 | 9:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Transmission Interruption | 9000 | 1300000 | Public Appeal |
| July | 2021-07-12 | 3:51 PM | 07/13/2021 | 5:00 PM | Colorado: Pueblo County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Sabotage | 0 | 0 | Physical Attack |
| July | 2021-07-14 | 2:15 PM | 07/14/2021 | 2:16 PM | California: Plumas County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather/Transmisison Interruption | 35 | 11000 | Weather |
| July | 2021-07-18 | 4:00 AM | 07/18/2021 | 9:46 AM | Illinois: Cook County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2021-07-20 | 4:21 PM | 07/20/2021 | 5:00 PM | Ohio: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2021-07-21 | 2:45 PM | 07/22/2021 | 12:00 PM | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 81503 | Weather |
| July | 2021-07-22 | 2:00 PM | 07/22/2021 | 2:40 PM | California: Shasta County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 220 | 0 | Operations |
| July | 2021-07-23 | 8:09 AM | 07/23/2021 | 8:30 AM | Minnesota: Hennepin County; | MRO/RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 15 | 3500 | Operations |
| July | 2021-07-23 | 8:20 AM | 07/23/2021 | 10:45 AM | Virginia: West Virginia: | RF/SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2021-07-24 | 8:30 PM | Unknown | Unknown | Michigan: Wayne County, Oakland County, Livingston County, Macomb County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 225949 | Weather |
| July | 2021-07-26 | 7:54 AM | Unknown | Unknown | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2021-07-28 | 12:54 PM | 07/28/2021 | 3:42 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2021-07-30 | 8:02 AM | 07/30/2021 | 9:34 AM | Wisconsin: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Cyber Event | 0 | 0 | Cyber Attack |
| August | 2021-08-01 | 9:00 AM | 08/04/2021 | 9:00 AM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| August | 2021-08-01 | 11:37 PM | 08/02/2021 | 12:00 AM | California: Humboldt County, Trinity County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 95 | 65888 | Weather |
| August | 2021-08-02 | 6:23 AM | 08/02/2021 | 3:55 PM | Texas: Hays County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 43 | 19000 | Weather |
| August | 2021-08-02 | 12:18 AM | 08/02/2021 | 10:47 AM | Texas: Hays County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather/Transmission Interruption | 24 | 9400 | Weather |
| August | 2021-08-03 | 4:35 AM | 08/03/2021 | 5:28 AM | Oregon: Linn County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 4 | Unknown | Operations |
| August | 2021-08-03 | 7:05 AM | 08/03/2021 | 7:32 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2021-08-10 | 10:30 PM | 08/13/2021 | 4:38 PM | Michigan: Allegan County, Antrim County, Barry County, Benzie County, Branch County, Calhoun County, Clare County, Clinton County, Crawford County, Eaton County, Genesee County, Gladwin County, Grand Traverse County, Gratiot County, Hillsdale County, Ingham County, Ionia County, Isabella County, Jackson County, Kalamazoo County, Kalkaska County, Kent County, Lake County, Leelanau County, Manistee County, Mason County, Mecosta County, Midland County, Missaukee County, Montcalm County, Muskegon County, Newaygo County, Oakland County, Oceana County, Ogemaw County, Osceola County, Oscoda County, Otsego County, Ottawa County, Roscommon County, Saginaw County, Shiawassee County, St. Joseph County, Van Buren County, Wexford County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 372600 | Weather |
| August | 2021-08-10 | 8:30 PM | 08/11/2021 | 7:00 PM | Illinois: | RF/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 318761 | Weather |
| August | 2021-08-10 | 8:00 PM | Unknown | Unknown | Wisconsin: Waukesha County, Milwaukee County, Kenosha County, Racine County, Washington County, Ozaukee County; | RF/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 233000 | Weather |
| August | 2021-08-11 | 3:35 PM | Unknown | Unknown | Michigan: Huron County, Macomb County, Lapeer County, Macomb County, Monroe County, Oakland County, St. Clair County, Tuscola County, Wayne County, Washtenaw County, Livingston County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 700000 | Weather |
| August | 2021-08-11 | 7:12 PM | 08/11/2021 | 9:49 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 92109 | Weather |
| August | 2021-08-12 | 10:03 PM | 08/12/2021 | 10:44 PM | Massachusetts: | NPCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2021-08-12 | 6:57 PM | 08/13/2021 | 6:00 AM | Illinois: Missouri: | RF/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 101000 | Weather |
| August | 2021-08-15 | 5:17 PM | 08/16/2021 | 3:30 AM | California: Solano County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| August | 2021-08-16 | 4:11 PM | 08/16/2021 | 4:31 PM | Montana: Flathead County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2021-08-17 | 2:00 PM | 08/18/2021 | 2:00 PM | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| August | 2021-08-17 | 7:15 PM | 08/18/2021 | 5:45 PM | California: Butte County, Colusa County, Glenn County, Lake County, Lassen County, Mendocino County, Napa County, Plumas County, Shasta County, Sierra County, Solano County, Sonoma County, Tehama County, Trinity County, Yolo County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 234 | 71000 | Weather |
| August | 2021-08-18 | 11:40 AM | 08/18/2021 | 12:13 PM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2021-08-20 | 3:35 PM | 08/20/2021 | 4:35 PM | California: Nevada County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2021-08-20 | 2:00 AM | 08/20/2021 | 3:00 AM | Oregon: Washington: Idaho: Utah: Salt Lake County; Wyoming: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| August | 2021-08-21 | 10:14 AM | 08/21/2021 | 10:52 AM | Idaho: Elmore County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 0 | 418 | Weather |
| August | 2021-08-22 | 12:11 PM | 08/23/2021 | 4:30 PM | Connecticut: Massachusetts: Maine: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 28134 | Weather |
| August | 2021-08-24 | 9:37 PM | Unknown | Unknown | Michigan: Huron County, Lapeer County, Macomb County, Monroe County, Oakland County, St. Clair County, Wayne County, Washtenaw County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 65000 | Weather |
| August | 2021-08-24 | 5:00 PM | 08/26/2021 | 2:07 PM | Michigan: Arenac County, Bay County, Clare County, Genesee County, Gladwin County, Gratiot County, Isabella County, Iosco County, Kalamazoo County, Kent County, Barry County, Missaukee County, Montcalm County, Muskegon County, Newaygo County, Mecosta County, Midland County, Saginaw County, Ottawa County, Van Buren County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 84987 | Weather |
| August | 2021-08-27 | 6:16 AM | 08/27/2021 | 10:14 AM | Arkansas: Pulaski County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2021-08-29 | 8:25 PM | Unknown | Unknown | New York: | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 796 | 0 | Transmission Interruption |
| August | 2021-08-29 | 9:32 AM | 08/29/2021 | 9:32 PM | Louisiana: Pointe Coupee Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| August | 2021-08-29 | 11:30 AM | Unknown | Unknown | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| August | 2021-08-29 | 6:04 PM | 08/31/2021 | 10:36 PM | Louisiana: St. Charles Parish; | SERC | Complete loss of off-site power (LOOP) affecting a nuclear generating station per the Nuclear Plant Interface Requirements. | Severe Weather | Unknown | Unknown | Weather |
| August | 2021-08-29 | 6:00 PM | 09/03/2021 | 1:41 PM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 91315 | Weather |
| August | 2021-08-29 | 10:39 PM | 09/03/2021 | 8:38 AM | Louisiana: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50000 | Weather |
| August | 2021-08-29 | 5:53 PM | Unknown | Unknown | Louisiana: | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | Unknown | Unknown | Weather |
| August | 2021-08-30 | 9:17 PM | 09/01/2021 | 3:19 PM | Florida: Leon County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| September | 2021-09-01 | 6:22 AM | 09/01/2021 | 3:56 PM | California: Santa Clara County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| September | 2021-09-01 | 5:30 PM | 09/02/2021 | 2:00 AM | Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 252740 | Weather |
| September | 2021-09-02 | 2:07 PM | 09/02/2021 | 2:10 PM | Texas: Williamson County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2021-09-07 | 5:30 PM | 09/09/2021 | 9:00 AM | Michigan: Osceola County, Kalamazoo County, Van Buren County, Saginaw County, Arenac County, Lake County, Clare County, Mecosta County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 80000 | Weather |
| September | 2021-09-07 | 8:00 PM | 09/09/2021 | 7:00 AM | Michigan: Wayne County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 60000 | Weather |
| September | 2021-09-08 | 12:15 PM | 09/08/2021 | 12:38 PM | North Dakota: Cass County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 37 | 1 | Transmission Interruption |
| September | 2021-09-09 | 5:00 PM | 09/09/2021 | 8:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | 8000 | 1300000 | Operations |
| September | 2021-09-09 | 4:00 PM | 09/09/2021 | 5:30 PM | California: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2021-09-10 | 2:05 PM | Unknown | Unknown | Iowa: Polk County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| September | 2021-09-10 | 11:17 AM | 09/10/2021 | 11:19 AM | North Dakota: McKenzie County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 6 | 1 | Transmission Interruption |
| September | 2021-09-10 | 7:20 AM | 09/10/2021 | 9:05 AM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 89 | 59649 | Weather |
| September | 2021-09-10 | 1:55 AM | 09/10/2021 | 2:04 AM | Florida: Citrus County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 75 | Unknown | Weather |
| September | 2021-09-11 | 8:32 AM | Unknown | Unknown | Texas: Austin County; California: Los Angeles County; | TRE/SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| September | 2021-09-13 | 12:18 PM | 09/13/2021 | 1:15 PM | Washington: Skagit County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2021-09-13 | 1:10 PM | Unknown | Unknown | Texas: Midland County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2021-09-13 | 11:59 PM | Unknown | Unknown | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 204280 | Weather |
| September | 2021-09-13 | 6:00 PM | 09/14/2021 | 12:49 AM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 66589 | Weather |
| September | 2021-09-14 | 12:35 AM | 09/18/2021 | 7:20 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1905 | 705415 | Weather |
| September | 2021-09-14 | 7:36 AM | 09/15/2021 | 1:48 AM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 0 | Unknown | Weather |
| September | 2021-09-14 | 7:52 AM | 09/14/2021 | 10:44 PM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 0 | Unknown | Weather |
| September | 2021-09-15 | 10:42 PM | 09/16/2021 | 12:37 AM | Texas: Kentucky: Arizona: New Mexico: Oregon: Washington: | TRE/SERC/WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| September | 2021-09-16 | 2:49 PM | 09/16/2021 | 8:02 PM | Oklahoma: | MRO/SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 100 | 4000 | Transmission Interruption |
| September | 2021-09-16 | 2:49 PM | 09/16/2021 | 8:02 PM | Oklahoma: | MRO/SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 100 | 4000 | Transmission Interruption |
| September | 2021-09-17 | 3:50 AM | 09/18/2021 | 4:08 AM | Indiana: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2021-09-17 | 11:00 PM | 09/19/2021 | 12:00 PM | Washington: Pierce County, Whatcom County, Skagit County, King County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 87000 | Weather |
| September | 2021-09-17 | 3:00 AM | 09/18/2021 | 10:00 PM | Minnesota: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 82000 | Weather |
| September | 2021-09-18 | 4:30 AM | 09/18/2021 | 6:00 AM | Indiana: Hamilton County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2021-09-22 | 9:36 AM | 09/23/2021 | 11:45 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1 | 0 | Physical Attack |
| September | 2021-09-22 | 5:17 PM | Unknown | Unknown | Michigan: Lenawee County, Livingston County, Genesee County, Tuscola County, Huron County, Sanilac County, Lapeer County, St. Clair County, Macomb County, Oakland County, Washtenaw County, Wayne County, Monroe County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 136000 | Weather |
| September | 2021-09-28 | 1:44 PM | 09/28/2021 | 1:56 PM | Kentucky: Henderson County; | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 20 | 5000 | Transmission Interruption |
| September | 2021-09-29 | 11:48 AM | 09/29/2021 | 12:21 PM | Missouri: Jackson County; | MRO/SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 150 | 0 | Operations |
| October | 2021-10-03 | 10:40 AM | 10/03/2021 | 11:54 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-04 | 7:00 AM | 10/04/2021 | 8:00 AM | Utah: Uintah County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| October | 2021-10-05 | 11:31 AM | 10/05/2021 | 11:32 AM | California: Santa Clara County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2021-10-05 | 11:31 AM | 10/05/2021 | 11:32 AM | California: Santa Clara County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| October | 2021-10-08 | 2:30 PM | 10/08/2021 | 6:32 PM | Ohio: Cuyahoga County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 210 | 0 | Operations |
| October | 2021-10-08 | 5:15 PM | 10/09/2021 | 6:15 PM | Maryland: Baltimore County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2021-10-08 | 6:30 AM | 10/08/2021 | 10:00 AM | California: Contra Costa County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2021-10-09 | 5:01 PM | 10/10/2021 | 6:30 AM | North Carolina: | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2021-10-10 | 10:15 PM | 10/12/2021 | 5:00 PM | Texas: Collin County, Dallas County, Denton County, Ellis County, Hunt County, Johnson County, Palo Pinto County, Tarrant County, Wichita County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 110000 | Weather |
| October | 2021-10-11 | 2:22 PM | 10/11/2021 | 8:30 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 126 | 84000 | Weather |
| October | 2021-10-12 | 8:08 PM | 10/12/2021 | 8:09 PM | Illinois: Cook County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-16 | 2:16 PM | 10/16/2021 | 6:41 PM | Oregon: Lane County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| October | 2021-10-18 | 10:18 PM | 10/18/2021 | 11:30 PM | Pennsylvania: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2021-10-18 | 11:26 PM | 10/19/2021 | 3:00 PM | Pennsylvania: Montgomery County; | RF | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-18 | 11:27 PM | 10/19/2021 | 10:05 AM | Georgia: DeKalb County; | SERC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-18 | 10:26 PM | 10/19/2021 | 8:19 AM | Missouri: Boone County; | SERC/MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-18 | 11:47 AM | 10/18/2021 | 11:48 AM | Florida: Putnam County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| October | 2021-10-19 | 3:34 PM | 10/19/2021 | 4:26 PM | Ohio: Summit County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 42 | 1 | Operations |
| October | 2021-10-20 | 11:00 PM | 10/21/2021 | 1:20 AM | Wisconsin: Eau Claire County; | MRO/RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2021-10-22 | 7:55 PM | 10/23/2021 | 5:55 AM | Louisiana: Lafayette Parish; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 132 | 0 | Operations |
| October | 2021-10-24 | 8:55 AM | 10/25/2021 | 6:15 PM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 116 | 59000 | Weather |
| October | 2021-10-24 | 7:00 AM | 10/26/2021 | 9:30 PM | Washington: King County, Pierce County, Skagit County, Thurston County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 233000 | Weather |
| October | 2021-10-27 | 5:57 PM | 10/28/2021 | 4:49 PM | Louisiana: Ascension Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| October | 2021-10-27 | 2:25 AM | 10/29/2021 | 8:37 AM | Connecticut: Maine: Massachusetts: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 169000 | Weather |
| October | 2021-10-28 | 12:47 PM | 10/28/2021 | 1:05 PM | Montana: Valley County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 20 | 0 | Operations |
| October | 2021-10-28 | 12:06 PM | 10/28/2021 | 12:30 PM | Texas: Haskell County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | Unknown | Unknown | Physical Attack |
| October | 2021-10-28 | 2:15 PM | 10/30/2021 | 8:00 AM | Texas: Angelina County, Bell County, Cherokee County, Collin County, Denton County, Dallas County, Ellis County, Hunt County, Johnson County, McLennan County, Nacogdoches County, Smith County, Tarrant County, Travis County, Williamson County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 250000 | Weather |
| October | 2021-10-28 | 2:45 PM | 10/29/2021 | 8:30 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 130000 | Weather |
| October | 2021-10-29 | 2:20 PM | 10/29/2021 | 3:00 PM | Vermont: Lamoille County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| October | 2021-10-30 | 7:31 AM | Unknown | Unknown | New Jersey: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| October | 2021-10-31 | 7:49 AM | 10/31/2021 | 9:32 AM | California: Alameda County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| November | 2021-11-04 | 9:34 PM | 11/04/2021 | 10:57 PM | Montana: Hill County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 44 | Unknown | Operations |
| November | 2021-11-06 | 6:45 AM | 11/06/2021 | 7:00 AM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2021-11-06 | 8:40 AM | 11/06/2021 | 8:41 AM | Washington: Grant County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | 350 | Physical Attack |
| November | 2021-11-08 | 10:53 PM | 11/08/2021 | 11:33 PM | Washington: King County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 9 | Unknown | Operations |
| November | 2021-11-09 | 8:50 AM | 11/09/2021 | 4:00 PM | Indiana: Floyd County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2021-11-09 | 6:00 PM | 11/09/2021 | 8:00 PM | Mississippi: Coahoma County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | Unknown | Public Appeal |
| November | 2021-11-10 | 9:19 PM | 11/11/2021 | 1:19 AM | Texas: Brazos County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2021-11-10 | 9:49 AM | 11/10/2021 | 10:05 AM | New York: | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2021-11-11 | 5:52 AM | 11/11/2021 | 6:09 AM | Texas: Montgomery County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 67 | Unknown | Operations |
| November | 2021-11-12 | 7:00 AM | 11/12/2021 | 7:14 AM | Oregon: Multnomah County; Washington: Idaho: Utah: Wyoming: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2021-11-15 | 11:47 AM | Unknown | Unknown | Colorado: Larimer County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2021-11-15 | 11:00 AM | 11/17/2021 | 6:00 AM | Washington: King County, Kitsap County, Whatcom County, Thurston County, Pierce County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 90000 | Weather |
| November | 2021-11-16 | 5:37 PM | 11/16/2021 | 6:21 PM | Maryland: Baltimore County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2021-11-16 | 12:42 AM | 11/16/2021 | 7:35 AM | California: Los Angeles County; | WECC | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2021-11-17 | 12:43 PM | 11/17/2021 | 1:25 PM | Michigan: Wexford County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2021-11-17 | 1:12 PM | Unknown | Unknown | Colorado: Larimer County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| November | 2021-11-21 | 10:00 AM | 11/21/2021 | 10:01 AM | Wisconsin: | MRO/RF | Cyber Security Incident that was an attempt to compromise a High or Medium Impact Bulk Electric System Cyber System or their associated Electronic Access Control or Monitoring Systems | Cyber Event | 0 | 0 | Cyber Attack |
| November | 2021-11-24 | 10:00 AM | 11/26/2021 | 10:21 AM | California: Riverside County, Ventura County, San Bernardino County, Orange County, Los Angeles County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 81406 | Weather |
| November | 2021-11-30 | 6:46 AM | 11/30/2021 | 6:47 AM | North Carolina: South Carolina: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| November | 2021-11-30 | 1:47 PM | 11/30/2021 | 2:21 PM | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 10 | 6000 | Operations |
| November | 2021-11-30 | 6:52 AM | 11/30/2021 | 7:25 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2021-11-30 | 5:00 AM | 11/30/2021 | 5:01 AM | Oregon: Multnomah County; Washington: Idaho: Utah: Wyoming: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2021-12-01 | 10:04 AM | 12/01/2021 | 1:08 PM | Wisconsin: Eau Claire County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2021-12-02 | 10:33 AM | 12/02/2021 | 1:10 PM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2021-12-07 | 2:33 PM | 12/07/2021 | 3:40 PM | Indiana: Putnam County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| December | 2021-12-08 | 9:04 AM | 12/08/2021 | 9:35 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2021-12-10 | 12:06 PM | 12/10/2021 | 1:07 PM | Idaho: Ada County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2021-12-11 | 3:13 AM | 12/15/2021 | 3:30 PM | Tennessee: Davidson County, Sumner County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 177 | 107344 | Weather |
| December | 2021-12-11 | 6:16 PM | 12/13/2021 | 5:00 PM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 103000 | Weather |
| December | 2021-12-11 | 11:13 AM | 12/12/2021 | 11:06 PM | Michigan: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 182410 | Weather |
| December | 2021-12-11 | 10:30 AM | 12/11/2021 | 3:00 PM | Michigan: Van Buren County, Gladwin County, Montcalm County, Branch County, Allegan County, Ionia County, Newaygo County, Mecosta County, Lake County, Midland County, Ogemaw County, Osceola County, Tuscola County; | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 159947 | Weather |
| December | 2021-12-12 | 6:14 AM | 12/12/2021 | 6:40 AM | Louisiana: De Soto Parish; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 36 | Unknown | Physical Attack |
| December | 2021-12-14 | 9:39 AM | 12/14/2021 | 9:48 AM | Washington: Chelan County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| December | 2021-12-14 | 7:28 AM | 12/14/2021 | 1:43 PM | California: Humboldt County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 120 | 65994 | Weather |
| December | 2021-12-15 | 3:56 PM | 12/15/2021 | 5:27 PM | Nebraska: Burt County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 5 | Unknown | Operations |
| December | 2021-12-15 | 7:00 PM | 12/16/2021 | 3:00 AM | Kansas: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 174000 | Weather |
| December | 2021-12-15 | 6:00 PM | 12/16/2021 | 9:00 AM | Iowa: Wisconsin: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 134000 | Weather |
| December | 2021-12-15 | 4:37 PM | 12/16/2021 | 11:30 AM | Missouri: Kansas: | SERC/MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 0 | 258000 | Weather |
| December | 2021-12-15 | 8:00 PM | Unknown | Unknown | Wisconsin: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 80000 | Weather |
| December | 2021-12-15 | 8:00 PM | Unknown | Unknown | Wisconsin: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 156000 | Weather |
| December | 2021-12-15 | 9:00 PM | Unknown | Unknown | Iowa: Minnesota: | MRO | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Severe Weather | Unknown | Unknown | Weather |
| December | 2021-12-15 | 4:37 PM | Unknown | Unknown | Missouri: Kansas: | SERC/MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| December | 2021-12-16 | 6:00 AM | 12/16/2021 | 8:00 PM | Michigan: Antrim County, Kalkaska County, Grand Traverse County, Leelanau County, Benzie County, Manistee County, Wexford County, Missaukee County, Lake County, Osceola County, Oceana County, Newaygo County, Mecosta County, Emmet County, Charlevoix County, Cheboygan County, Clare County, Roscommon County, Crawford County, Ogemaw County; | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 200675 | Weather |
| December | 2021-12-18 | 1:04 PM | 12/18/2021 | 9:59 PM | California: | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure or to operations | Suspicious Activity | 10 | 11770 | Physical Attack |
| December | 2021-12-19 | 8:48 PM | 12/19/2021 | 9:00 PM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2021-12-21 | 9:59 PM | 12/22/2021 | 2:15 PM | Texas: Cameron County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 22 | Unknown | Operations |
| December | 2021-12-23 | 2:02 PM | 12/23/2021 | 2:55 PM | Massachusetts: Suffolk County[13]; | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| December | 2021-12-23 | 1:10 AM | 12/23/2021 | 1:15 AM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2021-12-24 | 12:34 AM | 12/24/2021 | 6:40 AM | Texas: Rusk County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | Unknown | Unknown | Operations |
| December | 2021-12-27 | 9:01 PM | 12/30/2021 | 9:11 AM | California: Humboldt County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 120 | 65994 | Operations |
| December | 2021-12-27 | 4:11 AM | 01/01/2022 | 2:41 AM | California: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 381 | 115830 | Weather |
| December | 2021-12-29 | 11:00 AM | 12/29/2021 | 12:00 PM | Nevada: Clark County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2021-12-30 | 6:51 PM | Unknown | Unknown | Missouri: Adair County, Putnam County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2022-01-01 | 12:36 PM | 01/01/2022 | 2:12 PM | Washington: Thurston County; | WECC | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | System Operations | 0 | 0 | Physical Attack |
| January | 2022-01-01 | 12:36 PM | 01/02/2022 | 7:43 PM | Washington: Thurston County; | WECC | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | System Operations | 0 | 0 | Physical Attack |
| January | 2022-01-01 | 1:01 AM | Unknown | Unknown | Georgia: Clayton County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2022-01-01 | 12:06 AM | 01/01/2022 | 5:51 AM | New Hampshire: Merrimack County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 2 | 845 | Physical Attack |
| January | 2022-01-02 | 1:21 PM | 01/02/2022 | 5:38 PM | California: Tuolumne County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Severe Weather | 3 | 1706 | Weather |
| January | 2022-01-03 | 12:45 PM | 01/03/2022 | 12:46 PM | Washington: Thurston County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| January | 2022-01-03 | 5:00 AM | 01/04/2022 | 6:00 PM | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 60424 | Weather |
| January | 2022-01-03 | 5:30 AM | 01/04/2022 | 12:30 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 142000 | Weather |
| January | 2022-01-03 | 1:00 AM | 01/03/2022 | 2:00 PM | Georgia: Alabama: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 283 | 40885 | Weather |
| January | 2022-01-05 | 12:32 PM | 01/05/2022 | 12:45 PM | Massachusetts: Plymouth County; | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| January | 2022-01-08 | 2:56 AM | 01/08/2022 | 3:03 AM | Texas: Cameron County, Willacy County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| January | 2022-01-08 | 2:20 AM | 01/12/2022 | 7:40 AM | Florida: Citrus County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2022-01-08 | 6:07 PM | 01/08/2022 | 10:26 PM | New Hampshire: Merrimack County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2022-01-09 | 6:08 PM | Unknown | Unknown | Mississippi: Adams County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | Unknown | Unknown | Operations |
| January | 2022-01-12 | 9:20 AM | 01/12/2022 | 10:25 AM | Indiana: Kentucky: Ohio: | SERC/RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| January | 2022-01-13 | 4:00 PM | 01/13/2022 | 4:01 PM | Massachusetts: Hampden County[13]; | NPCC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2022-01-14 | 1:50 PM | 01/14/2022 | 2:13 PM | Pennsylvania: Bucks County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2022-01-15 | 2:09 PM | 01/15/2022 | 2:28 PM | New York: Orange County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2022-01-15 | 8:34 AM | 01/14/2022 | 8:42 AM | Texas: Potter County; New Mexico: | TRE/WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| January | 2022-01-16 | 12:05 PM | 01/17/2022 | 8:45 AM | North Carolina: Jackson County; South Carolina: Greenville County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 51289 | Weather |
| January | 2022-01-16 | 1:15 PM | 01/16/2022 | 5:15 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 74638 | Weather |
| January | 2022-01-16 | 5:15 AM | 01/17/2022 | 12:06 AM | Georgia: Alabama: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 436 | 61113 | Weather |
| January | 2022-01-18 | 10:22 PM | 01/18/2022 | 10:23 PM | Texas: Harris County; | TRE | Cyber Security Incident that was an attempt to compromise a High or Medium Impact Bulk Electric System Cyber System or their associated Electronic Access Control or Monitoring Systems | Cyber Event | 0 | 0 | Cyber Attack |
| January | 2022-01-19 | 2:35 PM | 01/19/2022 | 4:02 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2022-01-20 | 9:00 AM | 01/20/2022 | 9:59 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2022-01-20 | 7:57 PM | 01/21/2022 | 5:30 AM | Mississippi: Arkansas: Louisiana: Texas: | TRE/SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Severe Weather | 0 | 0 | Weather |
| January | 2022-01-23 | 12:37 AM | 01/23/2022 | 12:42 AM | Pennsylvania: Westmoreland County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2022-01-24 | 10:27 AM | 01/24/2022 | 10:51 AM | Washington: Chelan County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| January | 2022-01-24 | 11:50 AM | 01/24/2022 | 4:00 PM | New York: Dutchess County, Greene County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Sabotage | 0 | 0 | Physical Attack |
| January | 2022-01-26 | 1:37 PM | 01/26/2022 | 2:15 PM | Florida: Leon County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2022-01-27 | 11:30 AM | 01/27/2022 | 11:31 AM | Nevada: Clark County; | WECC | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Vandalism | 0 | 0 | Physical Attack |
| January | 2022-01-28 | 3:41 PM | 01/28/2022 | 9:30 PM | Colorado: Douglas County, Pueblo County, El Paso County, Prowers County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| January | 2022-01-29 | 8:45 AM | 01/30/2022 | 1:00 AM | Connecticut: Massachusetts: New Hampshire: Rhode Island: Vermont: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 120 | 12000 | Weather |
| January | 2022-01-30 | 8:41 PM | 01/31/2022 | 12:42 AM | Nebraska: | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2022-01-31 | 7:58 PM | 01/31/2022 | 8:10 PM | West Virginia: Monongalia County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2022-02-01 | 12:13 PM | 02/01/2022 | 12:25 PM | California: Yuba County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 10 | 8124 | Operations |
| February | 2022-02-03 | 10:00 AM | 02/07/2022 | 8:00 PM | Tennessee: Shelby County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 255000 | Weather |
| February | 2022-02-03 | 12:56 PM | 02/04/2022 | 8:30 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 51000 | Weather |
| February | 2022-02-03 | 12:56 PM | Unknown | Unknown | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 51000 | Weather |
| February | 2022-02-04 | 6:21 PM | 02/04/2022 | 10:00 PM | Texas: | TRE | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| February | 2022-02-04 | 1:10 PM | Unknown | Unknown | New York: Ulster County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 67404 | Weather |
| February | 2022-02-09 | 7:00 AM | 02/09/2022 | 9:00 AM | New York: Orange County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| February | 2022-02-12 | 4:29 PM | 02/12/2022 | 4:30 PM | California: Alameda County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | Unknown | Unknown | Physical Attack |
| February | 2022-02-17 | 12:09 AM | 02/17/2022 | 7:36 AM | Louisiana: Lafayette Parish; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 80 | 0 | Operations |
| February | 2022-02-17 | 10:30 AM | 02/17/2022 | 10:31 AM | Rhode Island: Providence County[13]; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2022-02-18 | 7:10 AM | 02/18/2022 | 4:25 PM | Connecticut: Maine: Massachusetts: New Hampshire: Vermont: Rhode Island: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 7 | 7047 | Weather |
| February | 2022-02-22 | 11:10 AM | 02/22/2022 | 12:15 PM | Texas: Llano County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2022-02-24 | 1:09 AM | 02/24/2022 | 2:59 AM | California: San Bernardino County, Kern County, Solano County, San Diego County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 246 | 0 | Operations |
| February | 2022-02-24 | 10:25 AM | 02/24/2022 | 10:31 AM | Texas: Montgomery County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 3 | 1405 | Transmission Interruption |
| February | 2022-02-25 | 9:31 AM | 02/25/2022 | 1:09 PM | Texas: Travis County; California: San Diego County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2022-02-26 | 11:15 AM | 02/26/2022 | 5:00 PM | Washington: Grant County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 0 | 0 | Physical Attack |
| February | 2022-02-28 | 9:25 AM | 02/28/2022 | 9:26 AM | Texas: Mitchell County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-01 | 1:43 PM | 03/01/2022 | 1:47 PM | Indiana: Marion County, Shelby County, Hendricks County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| March | 2022-03-02 | 9:26 AM | 03/02/2022 | 10:05 AM | North Carolina: South Carolina: | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2022-03-05 | 10:58 PM | 03/06/2022 | 7:38 PM | Illinois: DuPage County; | SERC/RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| March | 2022-03-06 | 2:30 AM | 03/06/2022 | 5:00 PM | Texas: Cameron County; | TRE | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| March | 2022-03-08 | 1:50 PM | 03/08/2022 | 2:39 PM | Georgia: Terrell County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 48 | 5855 | Operations |
| March | 2022-03-10 | 8:51 AM | 03/10/2022 | 3:15 PM | Nebraska: Scotts Bluff County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| March | 2022-03-11 | 6:35 AM | 03/11/2022 | 7:00 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2022-03-12 | 8:33 AM | Unknown | Unknown | Alabama: Georgia: Mississippi: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 139 | 19380 | Weather |
| March | 2022-03-13 | 10:15 PM | 03/13/2022 | 10:38 PM | Minnesota: Hennepin County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-14 | 9:30 AM | 03/14/2022 | 10:45 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-14 | 3:45 PM | Unknown | Unknown | New Jersey: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| March | 2022-03-15 | 11:11 AM | 03/15/2022 | 11:47 AM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2022-03-15 | 6:53 PM | 03/15/2022 | 8:33 PM | California: Lake County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 10 | 3958 | Physical Attack |
| March | 2022-03-16 | 11:28 AM | 03/16/2022 | 11:29 AM | California: Sacramento County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-17 | 12:59 PM | 44641 | 4:38 PM | North Carolina: Durham County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-18 | 4:32 PM | Unknown | Unknown | Florida: Palm Beach County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 78 | 20423 | Transmission Interruption |
| March | 2022-03-20 | 5:52 PM | 03/20/2022 | 10:20 PM | Minnesota: St. Louis County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2022-03-21 | 7:00 PM | 03/24/2022 | 12:00 AM | Texas: Anderson County, Bell County, Bosque County, Comanche County, Coryell County, Falls County, Freestone County, Hamilton County, Henderson County, Hill County, Lampasas County, Leon County, Limestone County, McLennan County, Milam County, Mills County, Robertson County, Collin County, Cooke County, Dallas County, Denton County, Ellis County, Erath County, Fannin County, Grayson County, Hood County, Hunt County, Johnson County, Kaufman County, Navarro County, Parker County, Rains County, Rockwall County, Somervell County, Tarrant County, Van Zandt County, Wise County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 170000 | Weather |
| March | 2022-03-22 | 9:04 PM | 03/22/2022 | 9:08 PM | Maryland: Prince George's County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2022-03-22 | 12:06 AM | 03/22/2022 | 4:29 AM | South Dakota: | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| March | 2022-03-25 | 8:46 PM | 03/25/2022 | 10:48 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2022-03-29 | 11:45 AM | Unknown | Unknown | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-29 | 4:34 PM | 03/30/2022 | 3:25 PM | Vermont: Chittenden County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2022-03-30 | 3:45 PM | Unknown | Unknown | Louisiana: Mississippi: Arkansas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 66448 | Weather |
| March | 2022-03-31 | 10:43 PM | Unknown | Unknown | Montana: Toole County; Florida: Palm Beach County; | WECC/SERC | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| March | 2022-03-31 | 8:59 AM | 04/01/2022 | 7:30 PM | Michigan: Huron County, Tuscola County, St. Clair County, Washtenaw County, Macomb County, Wayne County, Monroe County, Oakland County, Livingston County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 60 | 70000 | Weather |
| March | 2022-03-31 | 12:04 AM | 03/31/2022 | 9:20 AM | Georgia: Alabama: Mississippi: Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 157 | 22000 | Weather |
| April | 2022-04-05 | 4:40 AM | 04/05/2022 | 5:21 PM | Missouri: Jackson County; | SERC/RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 73 | 16299 | Operations |
| April | 2022-04-10 | 3:41 PM | 04/10/2022 | 3:50 PM | Arkansas: Pulaski County; | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 5 | Unknown | Operations |
| April | 2022-04-10 | 3:41 PM | 04/10/2022 | 3:50 PM | Arkansas: Pulaski County; | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 5 | Unknown | Operations |
| April | 2022-04-11 | 9:37 PM | 04/11/2022 | 10:14 PM | California: Riverside County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 2 | 1337 | Physical Attack |
| April | 2022-04-11 | 8:33 PM | 04/11/2022 | 8:40 PM | Maryland: Calvert County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2022-04-11 | 8:33 PM | 04/11/2022 | 8:40 PM | Maryland: Calvert County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2022-04-11 | 9:15 AM | 04/13/2022 | 8:00 AM | Oregon: Multnomah County, Clackamas County, Marion County, Yamhill County, Washington County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 3140 | 73717 | Weather |
| April | 2022-04-12 | 5:42 PM | 04/12/2022 | 6:38 PM | Arkansas: Ouachita County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack | 0 | 0 | Physical Attack |
| April | 2022-04-13 | 10:04 PM | 04/14/2022 | 12:02 AM | Louisiana: Iberia Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 7 | 2429 | Operations |
| April | 2022-04-14 | 5:59 AM | 04/14/2022 | 6:13 AM | California: Los Angeles County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 164 | 262268 | Transmission Interruption |
| April | 2022-04-16 | 12:17 PM | Unknown | Unknown | Missouri: | SERC/RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Generation Inadequacy | 0 | 0 | Generation Interruption |
| April | 2022-04-16 | 11:08 AM | Unknown | Unknown | Iowa: Polk County; Illinois: | SERC/MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| April | 2022-04-16 | 5:44 PM | Unknown | Unknown | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 9290 | Unknown | Operations |
| April | 2022-04-16 | 5:30 AM | 04/16/2022 | 11:38 AM | California: Shasta County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| April | 2022-04-16 | 10:45 AM | Unknown | Unknown | Washington: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2022-04-16 | 10:55 PM | 04/16/2022 | 10:57 PM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2022-04-19 | 6:00 AM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 97000 | Weather |
| April | 2022-04-19 | 8:41 AM | 04/19/2022 | 12:10 PM | Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 67754 | Weather |
| April | 2022-04-19 | 4:07 AM | Unknown | Unknown | New York: Broome County, Chemung County, Chenango County, Clinton County, Columbia County, Cortland County, Delaware County, Dutchess County, Erie County, Essex County, Greene County, Hamilton County, Herkimer County, Madison County, Oneida County, Otsego County, Putnam County, Saratoga County, Schoharie County, Schuyler County, Steuben County, Sullivan County, Tioga County, Tompkins County, Ulster County, Westchester County; | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 84033 | Weather |
| April | 2022-04-22 | 11:00 PM | 04/24/2022 | 4:00 PM | North Dakota: | MRO | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Severe Weather | 1000 | Unknown | Weather |
| April | 2022-04-22 | 11:16 PM | 04/24/2022 | 4:00 PM | North Dakota: Mountrail County, Williams County, Ward County, Burke County, Bottineau County, McLean County, Walsh County, Bowman County, Stark County, Dunn County, Mercer County; Montana: Wibaux County, Richland County; | WECC/MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | Unknown | Unknown | Weather |
| April | 2022-04-23 | 3:38 PM | 04/24/2022 | 4:00 AM | North Dakota: Mountrail County, Williams County; | MRO | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Severe Weather | 480 | 18430 | Weather |
| April | 2022-04-23 | 7:42 PM | 04/24/2022 | 4:17 PM | Iowa: Polk County, Warren County; Illinois: | SERC/MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 43 | 22400 | Weather |
| April | 2022-04-26 | 2:27 PM | Unknown | Unknown | Minnesota: Chisago County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 17 | 0 | Physical Attack |
| April | 2022-04-26 | 8:54 AM | 04/26/2022 | 8:55 AM | California: Sacramento County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| April | 2022-04-27 | 9:00 AM | 04/27/2022 | 9:01 AM | Ohio: Muskingum County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| April | 2022-04-28 | 7:56 AM | 04/28/2022 | 8:48 AM | North Carolina: South Carolina: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 74 | Unknown | Operations |
| April | 2022-04-28 | 3:45 PM | Unknown | Unknown | New Mexico: San Juan County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| April | 2022-04-29 | 7:05 AM | 04/29/2022 | 7:06 AM | California: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-02 | 2:24 PM | 05/02/2022 | 2:25 PM | California: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| May | 2022-05-03 | 6:42 AM | 05/03/2022 | 1:59 PM | New Hampshire: Carroll County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-03 | 12:17 AM | 05/04/2022 | 12:00 PM | Louisiana: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| May | 2022-05-04 | 2:07 PM | 05/05/2022 | 1:57 AM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | 0 | Operations |
| May | 2022-05-05 | 1:06 PM | 05/05/2022 | 2:06 PM | Arkansas: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | 0 | Transmission Interruption |
| May | 2022-05-06 | 3:02 AM | 05/06/2022 | 3:34 AM | Michigan: Jackson County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| May | 2022-05-09 | 4:25 PM | 05/09/2022 | 5:10 PM | Texas: Haskell County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-09 | 4:25 PM | 05/09/2022 | 5:10 PM | Texas: Haskell County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-11 | 10:00 AM | 05/11/2022 | 10:01 AM | Iowa: Clinton County; | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems; Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-11 | 6:00 PM | 05/11/2022 | 10:42 PM | Minnesota: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 105000 | Weather |
| May | 2022-05-12 | 2:58 PM | 05/12/2022 | 2:59 PM | Mississippi: Harrison County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-12 | 2:58 PM | 05/12/2022 | 2:59 PM | Mississippi: Lamar County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-12 | 1:00 AM | 05/12/2022 | 1:10 AM | Texas: Frio County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-12 | 4:50 PM | 05/13/2022 | 2:48 AM | South Dakota: Davison County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| May | 2022-05-12 | 10:44 AM | 05/12/2022 | 1:34 PM | Missouri: Barry County, Dade County, Lawrence County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 800 | 0 | Transmission Interruption |
| May | 2022-05-14 | 3:05 PM | 05/14/2022 | 4:30 PM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-15 | 9:00 PM | 05/15/2022 | 9:10 PM | Pennsylvania: Montgomery County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-15 | 9:00 PM | 05/15/2022 | 9:10 PM | Pennsylvania: Montgomery County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-15 | 11:30 PM | 05/17/2022 | 11:45 PM | Texas: Collin County, Dallas County, Denton County, Ellis County, Grayson County, Henderson County, Hunt County, Kaufman County, Navarro County, Rockwall County, Smith County, Tarrant County, Van Zandt County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 150000 | Weather |
| May | 2022-05-16 | 4:03 PM | 05/16/2022 | 7:32 PM | Arizona: Pima County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more; Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-16 | 5:00 AM | 05/16/2022 | 5:01 AM | California: Solano County, Santa Clara County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-17 | 12:10 PM | Unknown | Unknown | New Mexico: Roosevelt County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 25 | Unknown | Transmission Interruption |
| May | 2022-05-18 | 5:00 PM | 05/31/2022 | 12:00 PM | New Mexico: San Juan County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 560 | 0 | Fuel Supply Deficiency |
| May | 2022-05-18 | 11:00 AM | 05/18/2022 | 4:34 PM | Idaho: Madison County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| May | 2022-05-18 | 3:30 PM | 05/18/2022 | 4:30 PM | Pennsylvania: Philadelphia County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-20 | 8:48 AM | Unknown | Unknown | New York: Broome County, Monroe County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-20 | 5:26 PM | 05/20/2022 | 5:33 PM | New York: | NPCC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| May | 2022-05-21 | 9:53 PM | 05/22/2022 | 12:28 AM | Missouri: Jackson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| May | 2022-05-22 | 10:40 PM | 05/22/2022 | 11:16 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-22 | 2:30 AM | 05/22/2022 | 6:52 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 52172 | Weather |
| May | 2022-05-25 | 6:42 AM | 05/25/2022 | 6:43 AM | California: Siskiyou County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| May | 2022-05-27 | 7:56 AM | 05/27/2022 | 8:38 AM | Arizona: California: Nevada: New Mexico: | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-27 | 5:19 AM | 05/27/2022 | 6:00 AM | Ohio: Cuyahoga County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| May | 2022-05-29 | 1:18 AM | 05/29/2022 | 1:50 AM | Pennsylvania: Montgomery County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-29 | 4:41 PM | 05/31/2022 | 11:29 AM | Pennsylvania: York County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| May | 2022-05-30 | 2:10 PM | 05/31/2022 | 5:58 AM | California: San Diego County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| May | 2022-05-31 | 1:58 PM | 05/31/2022 | 1:59 PM | Texas: Travis County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-01 | 10:47 AM | 06/01/2022 | 10:48 AM | Utah: California: Oregon: Umatilla County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-02 | 8:20 AM | Unknown | Unknown | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-03 | 3:48 AM | 06/03/2022 | 3:49 AM | Georgia: DeKalb County; | SERC | Damage or destruction of a Facility within its Reliability Coordinator Area, Balancing Authority Area or Transmission Operator Area that results in action(s) to avoid a Bulk Electric System Emergency. | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-04 | 12:59 PM | 06/05/2022 | 2:15 AM | Texas: Ector County; | TRE | Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection. | Generation Inadequacy | 0 | 0 | Generation Interruption |
| June | 2022-06-05 | 3:20 PM | 06/05/2022 | 8:12 PM | California: | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational polic | Generation Inadequacy | Unknown | Unknown | Generation Interruption |
| June | 2022-06-06 | 10:21 AM | 06/06/2022 | 10:24 AM | California: Shasta County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 13 | 4000 | Operations |
| June | 2022-06-08 | 1:00 AM | 06/08/2022 | 6:00 AM | Missouri: Clay County, Jackson County; Kansas: Johnson County; | SERC/MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 911888 | Weather |
| June | 2022-06-08 | 12:00 AM | 06/08/2022 | 4:00 AM | Kansas: Missouri: Nebraska: | SERC/MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 62000 | Weather |
| June | 2022-06-08 | 1:00 AM | 06/08/2022 | 4:00 AM | Missouri: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Distribution Interruption | Unknown | 60000 | Weather |
| June | 2022-06-09 | 2:33 AM | 06/09/2022 | 6:49 AM | Texas: Dallas County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2022-06-09 | 7:00 AM | 06/09/2022 | 7:05 AM | Oregon: Douglas County; Washington: Idaho: Utah: Wyoming: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-10 | 8:27 PM | 06/10/2022 | 9:30 PM | California: Kern County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational polic | System Operations | 100 | 39094 | Operations |
| June | 2022-06-10 | 8:20 PM | 06/10/2022 | 8:28 PM | California: Kern County; | WECC | Firm load shedding of 100 Megawatts or more implemented under emergency operational polic | System Operations | 100 | Unknown | Operations |
| June | 2022-06-10 | 8:45 AM | Unknown | Unknown | California: | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 13437 | 445 | Operations |
| June | 2022-06-10 | 12:08 PM | 06/10/2022 | 9:30 PM | Texas: El Paso County; | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-12 | 11:30 PM | 06/13/2022 | 11:30 PM | Ohio: West Virginia: Virginia: Indiana: | SERC/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | 14000 | 100000 | Weather |
| June | 2022-06-13 | 11:54 PM | 06/14/2022 | 12:45 AM | Michigan: | RF | Complete loss of Interpersonal Communication and Alternative Interpersonal Communication capability affecting its staffed Bulk Electric System control center for 30 continuous minutes or more. Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2022-06-13 | 6:00 PM | 06/14/2022 | 6:15 PM | Ohio: Kentucky: | SERC/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 162551 | Weather |
| June | 2022-06-14 | 1:46 PM | Unknown | Unknown | Ohio: | RF | Firm load shedding of 100 Megawatts or more implemented under emergency operational polic | System Operations | 373 | Unknown | Operations |
| June | 2022-06-14 | 12:00 AM | 06/14/2022 | 6:00 AM | Washington: Grant County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-15 | 10:45 AM | 06/15/2022 | 1:45 PM | Michigan: Wayne County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2022-06-15 | 9:00 PM | Unknown | Unknown | Wisconsin: Outagamie County, Waupaca County, Winnebago County, Brown County, Sheboygan County, Ozaukee County, Waukesha County; Michigan: Iron County; | RF/MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 90 | 57000 | Weather |
| June | 2022-06-16 | 3:51 AM | 06/16/2022 | 6:30 AM | Washington: Lewis County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 35 | 7500 | Physical Attack |
| June | 2022-06-16 | 4:31 PM | 06/16/2022 | 8:07 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 77908 | Weather |
| June | 2022-06-17 | 6:45 PM | 06/18/2022 | 1:32 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 44000 | Weather |
| June | 2022-06-17 | 5:30 PM | 06/19/2022 | 9:15 PM | West Virginia: Virginia: Kentucky: | SERC/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 150000 | Weather |
| June | 2022-06-17 | 5:37 PM | 06/18/2022 | 12:54 AM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 91056 | Weather |
| June | 2022-06-17 | 6:02 AM | Unknown | Unknown | Illinois: Missouri: | SERC/RF | Cyber event that could potentially impact electric power system adequacy or reliability | Severe Weather | Unknown | 80000 | Weather |
| June | 2022-06-20 | 12:54 PM | 06/20/2022 | 2:23 PM | Minnesota: Hennepin County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 15604 | Operations |
| June | 2022-06-22 | 4:56 PM | 06/23/2022 | 2:00 AM | Virginia: | SERC/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Distribution Interruption | Unknown | 100000 | Weather |
| June | 2022-06-23 | 10:55 AM | Unknown | Unknown | California: | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 0 | 0 | Fuel Supply Deficiency |
| June | 2022-06-23 | 12:41 PM | 06/23/2022 | 1:41 PM | New Jersey: Cape May County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2022-06-24 | 11:09 PM | 06/25/2022 | 12:00 AM | Louisiana: | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | Unknown | Unknown | Fuel Supply Deficiency |
| June | 2022-06-26 | 5:05 PM | 06/26/2022 | 10:42 PM | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| June | 2022-06-27 | 5:07 PM | 06/28/2022 | 1:42 AM | Michigan: Wayne County; | RF/MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2022-06-27 | 6:21 AM | 06/27/2022 | 7:26 AM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2022-06-27 | 2:26 PM | 06/28/2022 | 3:56 AM | Texas: Victoria County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 14 | 2491 | Weather |
| June | 2022-06-28 | 9:27 AM | 06/28/2022 | 10:42 AM | Texas: Travis County; | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| June | 2022-06-28 | 9:39 AM | 06/28/2022 | 9:40 AM | Kentucky: Clark County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| June | 2022-06-30 | 7:58 PM | 06/30/2022 | 8:50 PM | Michigan: Wayne County; | RF | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2022-07-01 | 11:45 AM | Unknown | Unknown | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 20 | 0 | Physical Attack |
| July | 2022-07-03 | 10:30 AM | 07/03/2022 | 10:40 AM | California: Contra Costa County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-03 | 5:18 AM | 07/03/2022 | 8:24 AM | Oklahoma: | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-03 | 11:02 AM | Unknown | Unknown | California: Kern County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | Unknown | 1079 | Physical Attack |
| July | 2022-07-04 | 6:21 PM | Unknown | Unknown | California: Amador County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | System Operations | 3 | 3001 | Physical Attack |
| July | 2022-07-05 | 8:46 PM | 07/05/2022 | 9:40 PM | Iowa: Illinois: | RF/SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2022-07-05 | 8:00 AM | 07/05/2022 | 8:06 AM | Washington: Pierce County; Oregon: Idaho: Montana: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| July | 2022-07-06 | 4:23 PM | 07/06/2022 | 4:35 PM | Virginia: Fluvanna County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2022-07-06 | 6:18 AM | 07/06/2022 | 6:19 AM | Kentucky: Nelson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-06 | 12:40 PM | 07/06/2022 | 12:41 PM | Utah: California: Oregon: Douglas County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-06 | 1:58 AM | Unknown | Unknown | Oklahoma: Okmulgee County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 25 | 4836 | Physical Attack |
| July | 2022-07-06 | 2:39 PM | 07/07/2022 | 3:54 AM | Ohio: Kentucky: | RF/SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather/Transmission Interruption | Unknown | 104700 | Weather |
| July | 2022-07-09 | 2:47 AM | 07/09/2022 | 2:59 AM | Louisiana: Rapides Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | Unknown | 4724 | Operations |
| July | 2022-07-10 | 9:00 PM | 07/11/2022 | 8:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | Unknown | Operations |
| July | 2022-07-11 | 10:20 AM | Unknown | Unknown | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 2 | 0 | Physical Attack |
| July | 2022-07-12 | 10:45 AM | 07/12/2022 | 11:00 AM | Washington: Oregon: Clatsop County; Idaho: Montana: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| July | 2022-07-12 | 4:00 PM | Unknown | Unknown | Maryland: Baltimore County, Carroll County, Harford County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 800 | 165000 | Weather |
| July | 2022-07-12 | 6:00 PM | 07/12/2022 | 10:00 PM | District of Columbia: Maryland: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50200 | Weather |
| July | 2022-07-13 | 11:30 AM | 07/13/2022 | 9:00 PM | Texas: | TRE | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | Unknown | Operations |
| July | 2022-07-13 | 10:00 AM | 07/13/2022 | 1:00 PM | Colorado: La Plata County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-15 | 7:10 AM | 07/15/2022 | 7:11 AM | Nebraska: Wayne County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| July | 2022-07-18 | 9:15 AM | Unknown | Unknown | South Carolina: | SERC | Fuel supply emergencies that could impact electric power system adequacy or reliability | Fuel Supply Deficiency | 4500 | 0 | Fuel Supply Deficiency |
| July | 2022-07-18 | 1:09 PM | 07/18/2022 | 1:11 PM | Oregon: Josephine County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| July | 2022-07-19 | 3:42 PM | 07/19/2022 | 4:12 PM | Florida: Palm Beach County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2022-07-19 | 3:42 PM | 07/19/2022 | 4:12 PM | Florida: Palm Beach County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2022-07-23 | 8:45 PM | 07/24/2022 | 11:30 AM | Michigan: Muskegon County, Ottawa County, Kent County, Montcalm County, Ionia County, Allegan County, Van Buren County, Kalamazoo County, Barry County, Mason County, Shiawassee County, Ingham County, Genesee County, Saginaw County, Midland County, Wexford County, Grand Traverse County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 93750 | Weather |
| July | 2022-07-25 | 12:38 AM | 07/25/2022 | 1:46 PM | Pennsylvania: Erie County; | RF | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| July | 2022-07-26 | 6:38 AM | 07/26/2022 | 12:57 PM | Texas: Hays County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| July | 2022-07-26 | 4:20 AM | 07/26/2022 | 4:57 AM | California: Santa Barbara County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| July | 2022-07-26 | 9:00 PM | 07/26/2022 | 9:20 PM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2022-07-28 | 7:25 PM | 07/28/2022 | 10:41 PM | California: Placer County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 0 | 0 | Physical Attack |
| July | 2022-07-29 | 2:00 AM | 07/29/2022 | 2:01 AM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| July | 2022-07-30 | 7:35 PM | 08/01/2022 | 1:17 PM | California: Shasta County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| July | 2022-07-31 | 6:36 AM | 07/31/2022 | 7:13 AM | New York: Saratoga County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-01 | 9:44 AM | 08/01/2022 | 9:45 AM | Georgia: DeKalb County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-01 | 8:03 AM | 08/01/2022 | 9:00 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| August | 2022-08-03 | 2:00 AM | 08/03/2022 | 3:07 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2022-08-03 | 2:30 AM | Unknown | Unknown | Minnesota: Wisconsin: | MRO/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 80000 | Weather |
| August | 2022-08-03 | 7:00 PM | 08/05/2022 | 8:53 AM | Michigan: Wayne County, Washtenaw County, St. Clair County, Macomb County, Monroe County, Oakland County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 71000 | Weather |
| August | 2022-08-03 | 5:00 PM | 08/03/2022 | 8:30 PM | Michigan: Allegan County, Van Buren County, Barry County, Kalamazoo County, Calhoun County, Jackson County, Calhoun County, Washtenaw County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 91264 | Weather |
| August | 2022-08-04 | 6:00 PM | 08/05/2022 | 2:00 AM | Maryland: Anne Arundel County, Baltimore County, Baltimore, City of[16]; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 75500 | Weather |
| August | 2022-08-05 | 2:52 PM | 08/05/2022 | 4:41 PM | Washington: Lewis County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-05 | 2:00 AM | 08/05/2022 | 6:30 AM | Washington: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Actual Physical Attack | 3 | 350 | Physical Attack |
| August | 2022-08-09 | 4:42 PM | 08/09/2022 | 10:12 PM | Ohio: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | Unknown | 62464 | Operations |
| August | 2022-08-09 | 2:29 AM | 08/09/2022 | 3:00 AM | Missouri: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-09 | 12:12 PM | 08/09/2022 | 1:08 PM | Florida: Palm Beach County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-09 | 12:12 PM | 08/09/2022 | 1:08 PM | Florida: Palm Beach County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-09 | 3:18 PM | 08/09/2022 | 3:19 PM | Washington: Kitsap County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-10 | 3:00 PM | 08/10/2022 | 3:01 PM | Alabama: Jefferson County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-10 | 1:25 AM | 08/10/2022 | 1:30 AM | Arkansas: Lawrence County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 24 | 0 | Weather |
| August | 2022-08-10 | 7:56 PM | 08/11/2022 | 8:00 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 140464 | Weather |
| August | 2022-08-12 | 2:46 PM | 08/12/2022 | 2:47 PM | Georgia: Sumter County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-15 | 9:08 AM | 08/15/2022 | 9:10 AM | Nevada: Clark County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-15 | 11:43 PM | 08/16/2022 | 7:14 AM | Wyoming: Nebraska: | WECC/MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 5000 | Transmission Interruption |
| August | 2022-08-15 | 10:24 AM | 08/15/2022 | 12:49 PM | New Jersey: Gloucester County; | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Transmission Interruption | Unknown | 0 | Transmission Interruption |
| August | 2022-08-18 | 6:05 PM | 08/18/2022 | 9:39 PM | Ohio: Franklin County; | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | Unknown | Unknown | Operations |
| August | 2022-08-19 | 10:00 PM | 08/20/2022 | 11:30 AM | Washington: Clark County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| August | 2022-08-19 | 5:40 PM | 08/19/2022 | 5:41 PM | Massachusetts: Bristol County; | NPCC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack | 0 | 0 | Physical Attack |
| August | 2022-08-22 | 12:46 PM | 08/22/2022 | 1:09 PM | Texas: DeWitt County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 24 | 6385 | Operations |
| August | 2022-08-22 | 9:47 AM | 08/22/2022 | 9:48 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-22 | 8:40 PM | 08/22/2022 | 9:57 PM | Texas: El Paso County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 0 | 0 | Weather |
| August | 2022-08-24 | 2:20 PM | 08/24/2022 | 2:21 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-25 | 12:59 AM | 08/25/2022 | 1:00 AM | California: San Diego County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-25 | 12:59 AM | 08/25/2022 | 1:00 AM | California: San Diego County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-26 | 11:09 AM | 08/26/2022 | 11:10 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| August | 2022-08-27 | 2:21 AM | 08/27/2022 | 7:14 PM | Maine: | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-28 | 4:59 AM | 08/28/2022 | 6:06 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| August | 2022-08-29 | 10:45 AM | 08/29/2022 | 11:45 AM | Texas: Collin County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| August | 2022-08-29 | 3:00 PM | 09/01/2022 | 9:00 AM | Michigan: Ottawa County, Allegan County, Van Buren County, Montcalm County, Kent County, Barry County, Kalamazoo County, St. Joseph County, Branch County, Hillsdale County, Calhoun County, Jackson County, Eaton County, Clinton County, Shiawassee County, Montcalm County, Isabella County, Mecosta County, Midland County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 197740 | Weather |
| August | 2022-08-29 | 5:50 PM | Unknown | Unknown | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| August | 2022-08-31 | 9:58 AM | 08/31/2022 | 12:15 PM | Florida: Duval County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 10 | 3000 | Physical Attack |
| September | 2022-09-01 | 3:00 PM | 09/01/2022 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 242 | 44000 | Weather |
| September | 2022-09-04 | 6:50 PM | 09/05/2022 | 2:45 AM | California: Kings County; | WECC | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| September | 2022-09-04 | 4:00 PM | 09/06/2022 | 8:00 AM | Texas: Tarrant County, Collin County, Dallas County, Ellis County, Kaufman County, Rockwall County, Williamson County, Denton County, Archer County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 190000 | Weather |
| September | 2022-09-05 | 6:05 AM | 09/05/2022 | 9:00 PM | California: Sacramento County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | 0 | Public Appeal |
| September | 2022-09-06 | 4:30 PM | 09/07/2022 | 12:30 AM | California: San Diego County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| September | 2022-09-06 | 6:00 AM | 09/06/2022 | 6:22 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2022-09-06 | 10:34 AM | 09/06/2022 | 9:00 PM | California: Sacramento County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | 0 | Public Appeal |
| September | 2022-09-06 | 7:20 PM | 09/06/2022 | 9:01 PM | Idaho: Oregon: | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | Unknown | Public Appeal |
| September | 2022-09-06 | 5:00 PM | 09/06/2022 | 8:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | 8800 | 1300000 | Public Appeal |
| September | 2022-09-06 | 4:00 PM | 09/06/2022 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 272 | 44000 | Weather |
| September | 2022-09-07 | 1:45 PM | 09/07/2022 | 7:00 PM | Florida: Alachua County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Cyber Event | 0 | 0 | Cyber Attack |
| September | 2022-09-07 | 1:00 PM | Unknown | Unknown | California: Imperial County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| September | 2022-09-07 | 11:31 AM | 09/07/2022 | 9:00 PM | California: Sacramento County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | 0 | Public Appeal |
| September | 2022-09-07 | 5:00 PM | 09/07/2022 | 8:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | 8600 | 1300000 | Public Appeal |
| September | 2022-09-07 | 4:00 PM | 09/07/2022 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 257 | 44000 | Weather |
| September | 2022-09-08 | 10:52 AM | 09/09/2022 | 9:00 PM | California: Sacramento County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | Unknown | 0 | Public Appeal |
| September | 2022-09-08 | 5:00 PM | 09/08/2022 | 8:00 PM | Nevada: Clark County, Washoe County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | System Operations | 8250 | 1300000 | Public Appeal |
| September | 2022-09-08 | 11:54 AM | 09/08/2022 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 258 | 44000 | Weather |
| September | 2022-09-09 | 4:00 PM | 09/09/2022 | 9:00 PM | California: Shasta County; | WECC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System | Severe Weather | 257 | 44000 | Weather |
| September | 2022-09-10 | 10:30 PM | 09/10/2022 | 10:31 PM | Indiana: Spencer County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| September | 2022-09-11 | 6:19 PM | 09/11/2022 | 10:28 PM | Texas: Fayette County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2022-09-13 | 7:55 PM | 09/13/2022 | 8:01 PM | Texas: El Paso County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 0 | 0 | Weather |
| September | 2022-09-15 | 7:52 PM | 09/15/2022 | 9:31 PM | Texas: Fayette County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2022-09-16 | 6:00 PM | 09/16/2022 | 6:01 PM | Utah: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| September | 2022-09-16 | 6:30 PM | 09/16/2022 | 11:15 PM | Oregon: Multnomah County; Washington: Clark County; | WECC | Complete loss of Interpersonal Communication and Alternative Interpersonal Communication capability affecting its staffed Bulk Electric System control center for 30 continuous minutes or more. | Transmission Interruption | 0 | 0 | Transmission Interruption |
| September | 2022-09-21 | 4:19 PM | 09/21/2022 | 6:01 PM | Texas: Louisiana: Arkansas: Jefferson County; Mississippi: | TRE/SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 1521 | Physical Attack |
| September | 2022-09-22 | 3:58 AM | 09/22/2022 | 4:00 AM | Florida: Pinellas County, Pasco County, Orange County, Lake County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | Unknown | Unknown | Physical Attack |
| September | 2022-09-22 | 10:02 AM | 09/22/2022 | 11:00 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1 | 0 | Physical Attack |
| September | 2022-09-23 | 10:10 AM | 09/23/2022 | 11:00 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 2 | 0 | Physical Attack |
| September | 2022-09-27 | 8:42 AM | 09/27/2022 | 10:00 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1 | 0 | Physical Attack |
| September | 2022-09-28 | 3:00 PM | 10/03/2022 | 3:53 PM | Florida: Alachua County, Bay County, Citrus County, Columbia County, Dixie County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Suwannee County, Taylor County, Volusia County, Wakulla County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 676000 | Weather |
| September | 2022-09-28 | 6:00 PM | 09/30/2022 | 3:20 PM | Florida: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1000 | 116937 | Weather |
| September | 2022-09-28 | 3:00 PM | Unknown | Unknown | Florida: Hillsborough County, Polk County, Pasco County, Pinellas County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 750 | 291361 | Weather |
| September | 2022-09-29 | 4:00 AM | 10/03/2022 | 12:00 AM | Florida: Orange County, Osceola County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 0 | 0 | Weather |
| September | 2022-09-29 | 3:27 AM | Unknown | Unknown | Florida: Polk County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 150 | 15797 | Weather |
| September | 2022-09-30 | 11:00 AM | 09/30/2022 | 12:00 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 2 | 0 | Physical Attack |
| September | 2022-09-30 | 6:30 PM | 10/01/2022 | 6:36 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 154100 | Weather |
| September | 2022-09-30 | 1:46 PM | 09/30/2022 | 6:09 PM | South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 108930 | Weather |
| September | 2022-09-30 | 2:45 AM | 10/01/2022 | 4:15 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 48323 | Weather |
| October | 2022-10-03 | 6:00 AM | 10/04/2022 | 7:00 AM | Alabama: Barbour County; Virginia: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious activity | 0 | 0 | Physical Attack |
| October | 2022-10-03 | 1:45 PM | 10/03/2022 | 2:30 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1 | 0 | Physical Attack |
| October | 2022-10-08 | 4:23 PM | 10/08/2022 | 4:50 PM | New York: Queens County; | NPCC | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious activity | 100 | 0 | Physical Attack |
| October | 2022-10-10 | 3:50 PM | 10/10/2022 | 4:05 PM | Texas: Louisiana: Arkansas: Pope County; Mississippi: | TRE/SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| October | 2022-10-13 | 10:00 AM | 10/13/2022 | 11:00 AM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1 | 0 | Physical Attack |
| October | 2022-10-14 | 1:30 PM | Unknown | Unknown | Texas: Bee County; | RE | Reportable Cyber Security Incident | Cyber Event | 0 | 0 | Cyber Attack |
| October | 2022-10-14 | 1:15 PM | 10/14/2022 | 5:45 PM | Connecticut: Massachusetts: Maine: Rhode Island: New Hampshire: Vermont: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Sever Weather | Unknown | 76388 | Weather |
| October | 2022-10-15 | 9:52 AM | 10/15/2022 | 10:23 AM | Arizona: Maricopa County; | WECC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2022-10-15 | 8:04 PM | 10/18/2022 | 4:03 PM | Louisiana: Lafourche Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 69 | 16225 | Operations |
| October | 2022-10-18 | 3:12 PM | Unknown | Unknown | Texas: Louisiana: Arkansas: Pope County; Mississippi: | TRE/SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| October | 2022-10-21 | 11:15 AM | 10/21/2022 | 11:18 AM | California: Trinity County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious activity | 0 | 0 | Physical Attack |
| October | 2022-10-24 | 12:00 AM | 10/28/2022 | 12:00 AM | Massachusetts: Essex County[13]; | NPCC | Reportable Cyber Security Incident | Cyber Event | 0 | 0 | Cyber Attack |
| October | 2022-10-24 | 4:29 PM | 10/24/2022 | 6:05 PM | Texas: New Mexico: Chaves County; | TRE/WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 34 | 7551 | Operations |
| October | 2022-10-25 | 1:45 AM | 10/25/2022 | 1:50 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | System Operations | Unknown | 109865 | Operations |
| October | 2022-10-26 | 7:32 PM | 10/26/2022 | 8:38 PM | Texas: | TRE | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| October | 2022-10-27 | 12:01 AM | 10/27/2022 | 1:00 PM | Arkansas: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| October | 2022-10-28 | 2:16 PM | 10/28/2022 | 3:00 PM | California: Los Angeles County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 2 | 0 | Physical Attack |
| October | 2022-10-31 | 9:14 PM | 10/31/2022 | 10:14 PM | Louisiana: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious activity | Unknown | 0 | Physical Attack |
| November | 2022-11-02 | 3:11 PM | 11/02/2022 | 3:25 PM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2022-11-03 | 12:07 PM | 11/03/2022 | 2:24 PM | Washington: Douglas County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2022-11-04 | 8:05 PM | 11/07/2022 | 9:00 AM | Washington: Island County, King County, Kittitas County, Thurston County, Kitsap County, Pierce County, Skagit County, Whatcom County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 214000 | Weather |
| November | 2022-11-05 | 1:00 PM | 11/08/2022 | 7:00 AM | Michigan: Kalamazoo County, Kent County, Calhoun County, Genesee County, Ottawa County, Muskegon County, Eaton County, Saginaw County, Van Buren County, Hillsdale County, Shiawassee County, Jackson County, Lenawee County, Branch County, Montcalm County, Monroe County, Manistee County, Roscommon County, Clinton County, Ingham County, Gladwin County, Arenac County, Ogemaw County, Iosco County, Alcona County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 158450 | Weather |
| November | 2022-11-05 | 7:57 PM | Unknown | Unknown | Michigan: Oakland County, Wayne County, Monroe County, Lapeer County, St. Clair County, Washtenaw County, Macomb County, Tuscola County, Sanilac County, Huron County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 53000 | Weather |
| November | 2022-11-05 | 7:00 PM | Unknown | Unknown | Wisconsin: | MRO/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 50000 | Weather |
| November | 2022-11-08 | 3:48 PM | 11/08/2022 | 4:21 PM | Texas: Hockley County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| November | 2022-11-10 | 11:07 AM | 11/10/2022 | 12:00 PM | Arkansas: Pulaski County; | SERC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | Generation Inadequacy | 0 | 0 | Generation Interruption |
| November | 2022-11-10 | 6:00 AM | 11/11/2022 | 8:47 AM | Florida: Alachua County, Bay County, Citrus County, Columbia County, Dixie County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Suwannee County, Taylor County, Volusia County, Wakulla County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 160000 | Weather |
| November | 2022-11-11 | 1:00 AM | 11/11/2022 | 5:00 AM | California: San Bernardino County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| November | 2022-11-11 | 1:41 AM | 11/14/2022 | 2:00 PM | Ohio: Knox County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 7 | 1775 | Physical Attack |
| November | 2022-11-15 | 10:17 AM | 11/15/2022 | 11:06 AM | Massachusetts: Hampden County[13]; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2022-11-15 | 1:00 AM | 11/15/2022 | 6:00 AM | Oregon: Josephine County; Washington: Idaho: Utah: Wyoming: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2022-11-18 | 4:30 AM | 11/18/2022 | 4:59 AM | Washington: Cowlitz County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 3 | 1454 | Physical Attack |
| November | 2022-11-22 | 10:01 AM | 11/22/2022 | 10:43 AM | Maine: Penobscot County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2022-11-23 | 9:30 AM | Unknown | Unknown | Maryland: Delaware: New Jersey: Pennsylvania: Illinois: District of Columbia: | RF | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | Unknown | Unknown | Cyber Attack |
| November | 2022-11-23 | 12:46 PM | 11/23/2022 | 1:19 PM | Michigan: | RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2022-11-23 | 7:03 AM | 11/23/2022 | 8:57 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| November | 2022-11-23 | 10:15 AM | 11/23/2022 | 2:09 PM | Washington: Pierce County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| November | 2022-11-24 | 1:40 AM | 11/24/2022 | 1:45 AM | Oregon: Clackamas County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| November | 2022-11-25 | 5:00 AM | 11/25/2022 | 8:00 AM | California: Riverside County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 0 | 0 | Physical Attack |
| November | 2022-11-27 | 5:28 PM | 11/27/2022 | 11:58 PM | Maryland: Montgomery County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Transmission Interruption | 190 | 87500 | Transmission Interruption |
| November | 2022-11-28 | 1:08 AM | 11/28/2022 | 2:24 AM | Oregon: Clackamas County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack/Vandalism | Unknown | 6337 | Physical Attack |
| November | 2022-11-30 | 2:37 AM | 11/30/2022 | 6:10 AM | New York: Broome County; | NPCC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| November | 2022-11-30 | 6:45 PM | 12/02/2022 | 4:00 AM | Maine: Massachusetts: Connecticut: Rhode Island: Vermont: New Hampshire: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 113 | 113000 | Weather |
| November | 2022-11-30 | 3:35 AM | 11/30/2022 | 9:10 AM | Alabama: Mississippi: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 386 | 54110 | Weather |
| December | 2022-12-03 | 7:51 PM | Unknown | Unknown | North Carolina: Moore County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 99 | 45000 | Physical Attack |
| December | 2022-12-05 | 6:20 PM | 12/05/2022 | 6:55 PM | Pennsylvania: York County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-05 | 9:00 AM | 12/05/2022 | 1:00 PM | New York: Orange County; | NPCC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-06 | 9:25 AM | Unknown | Unknown | California: Sacramento County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-06 | 8:26 AM | 12/06/2022 | 8:30 AM | Kentucky: Jefferson County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-06 | 12:00 AM | 12/06/2022 | 12:01 AM | Georgia: Heard County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-06 | 12:00 AM | 12/06/2022 | 12:01 AM | Georgia: Bartow County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-06 | 12:45 PM | Unknown | Unknown | Ohio: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 2600 | Unknown | Physical Attack |
| December | 2022-12-06 | 8:15 AM | 12/06/2022 | 12:15 PM | Pennsylvania: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 1883 | Unknown | Physical Attack |
| December | 2022-12-07 | 1:35 PM | 12/07/2022 | 1:40 PM | Illinois: Cook County; | SERC/RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-07 | 4:42 PM | 12/07/2022 | 9:00 PM | North Carolina: South Carolina: | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-08 | 12:36 PM | Unknown | Unknown | Indiana: Vigo County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-10 | 11:00 AM | 12/12/2022 | 6:00 AM | Missouri: Greene County, Dunklin County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-10 | 1:14 AM | 12/10/2022 | 2:02 AM | Massachusetts: Suffolk County[13]; | NPCC | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | Transmission Interruption | 0 | 0 | Transmission Interruption |
| December | 2022-12-13 | 11:59 PM | 12/14/2022 | 3:39 AM | Washington: Spokane County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 10 | 583 | Physical Attack |
| December | 2022-12-14 | 10:42 AM | 12/14/2022 | 12:05 PM | Florida: Hillsborough County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2022-12-14 | 11:23 AM | Unknown | Unknown | Indiana: | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-14 | 12:52 PM | Unknown | Unknown | Montana: Richland County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| December | 2022-12-15 | 5:30 AM | 12/15/2022 | 5:31 AM | Utah: Salt Lake County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-16 | 11:30 PM | 12/18/2022 | 11:21 PM | Massachusetts: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 36600 | Weather |
| December | 2022-12-17 | 7:45 PM | 12/17/2022 | 7:46 PM | Texas: Kaufman County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-22 | 9:04 PM | 12/22/2022 | 9:42 PM | Texas: Montgomery County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| December | 2022-12-22 | 9:04 AM | 12/25/2022 | 12:00 AM | Tennessee: Alabama: Mississippi: Kentucky: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Transmission Interruption | 3200 | Unknown | Transmission Interruption |
| December | 2022-12-23 | 6:04 AM | 12/23/2022 | 6:40 AM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| December | 2022-12-23 | 2:30 PM | Unknown | Unknown | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 57000 | Weather |
| December | 2022-12-23 | 5:20 AM | Unknown | Unknown | Connecticut: Rhode Island: Massachusetts: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 500000 | Weather |
| December | 2022-12-23 | 9:45 AM | 12/23/2022 | 5:00 PM | North Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 66519 | Weather |
| December | 2022-12-23 | 7:30 AM | 12/23/2022 | 10:13 PM | North Carolina: South Carolina: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 108900 | Weather |
| December | 2022-12-23 | 8:31 AM | Unknown | Unknown | Tennessee: Shelby County; | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | Unknown | Unknown | Weather |
| December | 2022-12-23 | 3:03 AM | 12/23/2022 | 12:30 PM | Alabama: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 236 | 33010 | Weather |
| December | 2022-12-23 | 7:19 AM | 12/23/2022 | 7:41 AM | Missouri: Jasper County; | SERC | Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System. | Severe Weather | 0 | 0 | Weather |
| December | 2022-12-24 | 6:35 AM | 12/24/2022 | 4:10 PM | North Carolina: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | System Operations | 960 | 130000 | Operations |
| December | 2022-12-24 | 6:15 AM | 12/25/2022 | 9:00 AM | South Carolina: | SERC | System-wide voltage reductions of 3 percent or more. | Severe Weather | 4615 | 17600 | Weather |
| December | 2022-12-24 | 4:45 AM | 12/24/2022 | 3:45 PM | North Carolina: South Carolina: | SERC | Firm load shedding of 100 Megawatts or more implemented under emergency operational policy. | Severe Weather | 1000 | 295000 | Weather |
| December | 2022-12-24 | 9:00 AM | 12/24/2022 | 11:15 AM | Alabama: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | 160 | 22436 | Weather |
| December | 2022-12-25 | 7:25 PM | 12/25/2022 | 8:07 PM | Washington: Pierce County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 32 | 13500 | Physical Attack |
| December | 2022-12-25 | 2:42 AM | 12/25/2022 | 4:55 AM | Washington: Pierce County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 14 | 8000 | Physical Attack |
| December | 2022-12-26 | 6:54 AM | 12/26/2022 | 8:19 AM | Washington: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| December | 2022-12-26 | 8:30 AM | 12/28/2022 | 9:00 PM | Washington: King County, Island County, Kittitas County, Kitsap County, Pierce County, Skagit County, Thurston County, Whatcom County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 230000 | Weather |
| December | 2022-12-27 | 8:00 AM | 12/27/2022 | 8:30 AM | Washington: Lewis County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-27 | 1:30 PM | 12/27/2022 | 9:16 PM | California: San Diego County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-27 | 7:07 AM | 12/29/2022 | 11:10 AM | California: Sacramento County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| December | 2022-12-27 | 7:20 AM | 12/27/2022 | 11:22 AM | California: Sacramento County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-27 | 10:12 AM | Unknown | Unknown | Oregon: Clackamas County, Columbia County, Marion County, Multnomah County, Polk County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 83060 | Weather |
| December | 2022-12-27 | 8:40 PM | 12/27/2022 | 8:41 PM | Washington: King County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system. | Severe Weather | 11 | 11600 | Weather |
| December | 2022-12-29 | 1:14 PM | 12/29/2022 | 1:55 PM | Washington: King County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| December | 2022-12-29 | 4:00 PM | Unknown | Unknown | Ohio: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 2600 | Unknown | Physical Attack |
| December | 2022-12-30 | 5:25 AM | 12/30/2022 | 2:17 PM | Oregon: Sherman County; | WECC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| December | 2022-12-30 | 5:04 PM | Unknown | Unknown | Minnesota: Washington County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| December | 2022-12-31 | 8:00 PM | 01/03/2023 | 12:00 AM | Nevada: | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 3500 | Weather |
| December | 2022-12-31 | 7:00 PM | 01/01/2023 | 6:00 AM | California: Sacramento County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more. | Severe Weather | Unknown | 161000 | Weather |
| January | 2023-01-01 | 12:06 AM | 01/01/2023 | 3:57 AM | California: Riverside County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-01 | 9:55 AM | 01/01/2023 | 10:30 AM | California: Sacramento County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2023-01-01 | 2:47 PM | 01/01/2023 | 4:50 PM | Florida: Citrus County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 19 | 3509 | Physical Attack |
| January | 2023-01-02 | 4:12 PM | 01/03/2023 | 9:30 AM | Texas: Dallas County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-02 | 3:16 AM | 01/02/2023 | 4:46 PM | New Mexico: | WECC | Physical attack that causes major interruptions or impacts to critical infrastructure or to operations | Vandalism | 432 | 0 | Physical Attack |
| January | 2023-01-02 | 6:22 PM | 01/02/2023 | 10:27 PM | Arkansas: Union County; Louisiana: Ouachita Parish; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Severe Weather | 20 | 6849 | Weather |
| January | 2023-01-03 | 11:45 AM | 01/03/2023 | 12:00 PM | Michigan: Ingham County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-05 | 8:19 AM | 01/05/2023 | 8:20 AM | Louisiana: Concordia Parish; | SERC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 23 | 1631 | Transmission Interruption |
| January | 2023-01-05 | 7:30 AM | 01/05/2023 | 9:30 AM | Washington: Lewis County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-06 | 9:30 AM | 01/06/2023 | 11:30 AM | Ohio: Sandusky County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2023-01-07 | 10:00 PM | 01/08/2023 | 9:00 PM | California: Sacramento County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 458 | 185434 | Weather |
| January | 2023-01-07 | 11:44 PM | 01/08/2023 | 2:29 AM | Texas: Jasper County, Tyler County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 20 | 9823 | Transmission Interruption |
| January | 2023-01-08 | 6:40 PM | 01/08/2023 | 6:54 PM | Texas: Bowie County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-12 | 10:00 AM | Unkonwn | Unknown | California: Sacramento County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-12 | 2:00 PM | 01/13/2023 | 3:00 AM | Alabama: Georgia: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 1158 | 162000 | Weather |
| January | 2023-01-12 | 11:58 AM | 01/12/2023 | 12:30 PM | Washington: King County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | Unknown | Physical Attack |
| January | 2023-01-13 | 12:00 AM | 01/13/2023 | 1:00 AM | Texas: Fayette County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-19 | 11:00 AM | 01/19/2023 | 1:00 PM | South Carolina: Sumter County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2023-01-20 | 10:45 AM | Unknown | Unknown | Michigan: Oakland County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | Unknown | 0 | Physical Attack |
| January | 2023-01-23 | 7:05 AM | 01/24/2023 | 5:17 PM | Connecticut: Rhode Island: Massachusetts: Vermont: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 41000 | Weather |
| January | 2023-01-23 | 5:00 PM | Unknown | Unknown | California: Sacramento County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2023-01-23 | 9:21 AM | Unknown | Unknown | California: Sacramento County; | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2023-01-24 | 2:00 PM | 01/24/2023 | 3:00 PM | Louisiana: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-24 | 5:10 PM | 01/24/2023 | 5:20 PM | New York: Queens County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-24 | 3:25 PM | 01/26/2023 | 8:20 PM | Texas: Harris County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 100731 | Weather |
| January | 2023-01-25 | 10:30 PM | 01/26/2023 | 12:01 AM | Washington: Kitsap County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-25 | 3:57 PM | 01/25/2023 | 5:38 PM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-25 | 3:30 AM | 01/25/2023 | 1:00 PM | Arkansas: Texas: Louisiana: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 60958 | Weather |
| January | 2023-01-26 | 7:00 AM | 01/26/2023 | 2:46 PM | Washington: King County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| January | 2023-01-28 | 4:00 AM | 01/28/2023 | 5:00 AM | Illinois: Franklin County; | SERC/RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| January | 2023-01-29 | 8:19 AM | 01/29/2023 | 11:07 AM | Kentucky: | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| January | 2023-01-30 | 10:30 AM | Unknown | Unknown | Minnesota: | MRO | Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center. | Suspicious Activity | Unknown | Unknown | Physical Attack |
| January | 2023-01-31 | 8:15 AM | 02/06/2023 | 5:00 PM | Texas: Dallas County, Anderson County, Bosque County, Collin County, Comanche County, Cooke County, Delta County, Denton County, Ellis County, Erath County, Fannin County, Freestone County, Hamilton County, Henderson County, Hill County, Hood County, Hopkins County, Hunt County, Jack County, Johnson County, Kaufman County, Lamar County, Navarro County, Palo Pinto County, Parker County, Rains County, Red River County, Rockwall County, Somervell County, Tarrant County, Van Zandt County, Wichita County, Wise County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 360000 | Weather |
| February | 2023-02-01 | 5:00 AM | 02/04/2023 | 10:39 PM | Texas: Travis County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 370 | 173879 | Weather |
| February | 2023-02-02 | 10:07 PM | 02/03/2023 | 4:08 PM | Colorado: | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2023-02-02 | 11:00 AM | Unknown | Unknown | Pennsylvania: Westmoreland County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-02 | 8:15 AM | 02/02/2023 | 7:45 PM | Arkansas: Mississippi: Texas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 74426 | Weather |
| February | 2023-02-02 | 2:37 PM | 02/02/2023 | 2:47 PM | Maryland: Cecil County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-03 | 4:00 PM | 02/03/2023 | 4:45 PM | Oregon: Washington: Yakima County; Idaho: Utah: Wyoming: | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| February | 2023-02-04 | 11:14 AM | 02/04/2023 | 12:55 PM | Ohio: Gallia County; | RF | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 2000 | Unknown | Physical Attack |
| February | 2023-02-06 | 5:06 PM | 02/06/2023 | 5:31 PM | Florida: Hillsborough County; | SERC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2023-02-06 | 10:00 AM | 02/06/2023 | 10:02 AM | Maryland: | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-07 | 1:34 PM | 02/07/2023 | 2:06 PM | Wisconsin: La Crosse County; | MRO | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| February | 2023-02-07 | 6:15 AM | 02/07/2023 | 6:20 AM | Illinois: DuPage County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-07 | 8:30 AM | Unknown | Unknown | New York: Queens County; | NPCC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-08 | 1:30 PM | 02/08/2023 | 2:00 PM | Pennsylvania: Lawrence County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-11 | 11:17 AM | 02/11/2023 | 6:20 PM | Texas: Taylor County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2023-02-13 | 9:50 PM | 02/14/2023 | 2:24 AM | California: San Diego County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-13 | 5:27 AM | 02/13/2023 | 3:00 PM | Wisconsin: Chippewa County; | MRO | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2023-02-15 | 2:25 PM | 02/15/2023 | 2:30 PM | Florida: Clay County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-18 | 12:00 AM | 02/18/2023 | 12:05 AM | Oklahoma: Kay County; | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-19 | 8:18 AM | 02/19/2023 | 12:15 PM | California: Riverside County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| February | 2023-02-21 | 9:45 AM | Unknown | Unknown | Texas: Cameron County; | TRE | Cyber event that could potentially impact electric power system adequacy or reliability | Cyber Event | 0 | 0 | Cyber Attack |
| February | 2023-02-21 | 5:27 AM | 02/21/2023 | 6:41 AM | Florida: Hillsborough County; | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | Transmission Interruption | 0 | 0 | Transmission Interruption |
| February | 2023-02-21 | 1:14 PM | 02/21/2023 | 2:36 PM | Florida: Orange County; | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack/Vandalism | Unknown | 2547 | Physical Attack |
| February | 2023-02-22 | 6:41 PM | 02/25/2023 | 4:12 PM | Michigan: Van Buren County, Kalamazoo County, St. Joseph County, Calhoun County, Branch County, Hillsdale County, Jackson County, Washtenaw County, Monroe County, Lenawee County, Ingham County, Barry County, Allegan County, Ottawa County, Eaton County, Ingham County, Shiawassee County, Clinton County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 261043 | Weather |
| February | 2023-02-22 | 6:30 PM | Unknown | Unknown | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 6200 | 623358 | Weather |
| February | 2023-02-22 | 4:00 PM | 02/22/2023 | 4:01 PM | South Dakota: | MRO | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-23 | 4:30 AM | 02/23/2023 | 1:00 PM | Wisconsin: Kenosha County, Racine County, Milwaukee County, Walworth County, Jefferson County, Waukesha County; Michigan: | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 143 | 57000 | Weather |
| February | 2023-02-23 | 8:50 AM | 02/23/2023 | 12:38 PM | Colorado: Larimer County; | WECC | Fuel supply emergencies that could impact electric power system adequacy or reliability | System Operations | 0 | 0 | Operations |
| February | 2023-02-24 | 12:29 PM | 02/24/2023 | 12:45 PM | Florida: Pasco County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| February | 2023-02-25 | 12:08 AM | 02/26/2023 | 6:08 PM | California: Los Angeles County; | WECC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 153555 | Weather |
| February | 2023-02-26 | 2:08 PM | 02/26/2023 | 3:13 PM | North Carolina: | SERC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack/Vandalism | Unknown | Unknown | Physical Attack |
| February | 2023-02-27 | 1:25 PM | 02/27/2023 | 11:59 PM | Michigan: Newaygo County, Oceana County, Ionia County, Montcalm County, Jackson County, Van Buren County, Washtenaw County, Hillsdale County, Lenawee County; | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 76000 | Weather |
| February | 2023-02-28 | 8:00 AM | 02/28/2023 | 8:30 AM | Wisconsin: Outagamie County; | MRO | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 14 | 0 | Physical Attack |
| March | 2023-03-01 | 12:00 AM | 03/01/2023 | 12:41 AM | Indiana: Hamilton County; | MRO | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2023-03-02 | 7:00 PM | 03/04/2023 | 11:00 PM | Texas: Montague County, Cooke County, Grayson County, Fannin County, Lamar County, Young County, Jack County, Wise County, Denton County, Collin County, Hunt County, Delta County, Hopkins County, Stephens County, Palo Pinto County, Parker County, Tarrant County, Dallas County, Rockwall County, Kaufman County, Van Zandt County, Rains County, Eastland County, Erath County, Hood County, Somervell County, Johnson County, Ellis County, Henderson County, Comanche County, Mills County, Hamilton County, Bosque County, Hill County, Navarro County, Freestone County, Anderson County, Lampasas County, Coryell County, Bell County, McLennan County, Falls County, Limestone County, Leon County, Milam County, Robertson County; | TRE | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 470000 | Weather |
| March | 2023-03-03 | 1:45 PM | 03/03/2023 | 1:50 PM | Illinois: Cook County; | SERC/RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2023-03-03 | 9:45 AM | 03/03/2023 | 9:50 AM | Mississippi: | SERC | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 38 | 12014 | Operations |
| March | 2023-03-03 | 8:00 AM | 03/03/2023 | 8:01 AM | Texas: Tarrant County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2023-03-03 | 3:40 PM | Unknown | Unknown | Kentucky: Oldham County, Jefferson County, Fayette County, Franklin County, Hardin County, Hart County, Hopkins County, Jessamine County, Muhlenberg County, Nelson County, Scott County, Shelby County, Spencer County, Washington County, Woodford County, Bullitt County, Meade County, Lyon County, LaRue County, Henry County, Grayson County, Boyle County, Christian County, Anderson County; Virginia: Wise County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 346000 | Weather |
| March | 2023-03-03 | 7:28 PM | 03/03/2023 | 8:54 PM | Ohio: Kentucky: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 57186 | Weather |
| March | 2023-03-03 | 2:00 PM | 03/04/2023 | 4:00 AM | Tennessee: Davidson County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 115000 | Weather |
| March | 2023-03-03 | 5:50 PM | 03/05/2023 | 12:01 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 0 | 200000 | Weather |
| March | 2023-03-03 | 12:45 PM | 03/03/2023 | 10:42 PM | Alabama: Georgia: Mississippi: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 346 | 48384 | Weather |
| March | 2023-03-03 | 3:40 PM | Unknown | Unknown | Kentucky: Oldham County, Jefferson County, Fayette County, Franklin County, Hardin County, Hart County, Hopkins County, Jessamine County, Muhlenberg County, Nelson County, Scott County, Shelby County, Spencer County, Washington County, Woodford County, Bullitt County, Meade County, Lyon County, LaRue County, Henry County, Grayson County, Boyle County, Christian County, Anderson County; Virginia: Williamsburg, City of[23], Wise County; | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| March | 2023-03-04 | 7:05 AM | 03/04/2023 | 7:06 AM | Louisiana: | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Transmission Interruption | 965 | 33 | Transmission Interruption |
| March | 2023-03-04 | 7:05 AM | 03/04/2023 | 7:06 AM | Louisiana: | SERC | Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident | Transmission Interruption | 800 | Unknown | Transmission Interruption |
| March | 2023-03-05 | 8:03 PM | 03/06/2023 | 3:38 PM | Georgia: Fulton County; | SERC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2023-03-05 | 11:53 AM | 03/06/2023 | 7:51 AM | West Virginia: Randolph County, Barbour County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-06 | 4:18 PM | 03/06/2023 | 5:30 PM | Virginia: Orange County; | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Actual Physical Attack/Vandalism | 1 | 0 | Physical Attack |
| March | 2023-03-07 | 11:00 AM | 03/07/2023 | 3:45 PM | Texas: Lubbock County; New Mexico: | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-07 | 10:26 AM | 03/07/2023 | 2:42 PM | Texas: Lubbock County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-08 | 12:02 AM | Unknown | Unknown | Texas: Bee County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-08 | 1:00 AM | 03/08/2023 | 2:00 AM | Indiana: Hendricks County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-09 | 6:00 PM | 03/10/2023 | 6:00 PM | Wisconsin: Walworth County, Waukesha County, Milwaukee County, Racine County, Ozaukee County, Kenosha County; | MRO/RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 250 | 100000 | Weather |
| March | 2023-03-10 | 4:48 AM | 03/10/2023 | 1:07 PM | Texas: Webb County, Hidalgo County; | TRE | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| March | 2023-03-10 | 8:00 AM | 03/10/2023 | 8:56 AM | Idaho: Ada County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-14 | 8:00 AM | 03/16/2023 | 8:20 AM | Connecticut: Massachusetts: Vermont: Rhode Island: New Hampshire: Maine: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 83000 | Weather |
| March | 2023-03-14 | 9:25 AM | 03/15/2023 | 3:00 PM | New York: | NPCC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | Unknown | Weather |
| March | 2023-03-16 | 10:34 AM | 03/16/2023 | 2:26 PM | Texas: Lubbock County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2023-03-22 | 5:45 AM | 03/22/2023 | 5:46 AM | Pennsylvania: Greene County; | RF | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 621 | 0 | Physical Attack |
| March | 2023-03-23 | 5:19 PM | 03/23/2023 | 6:06 PM | Washington: King County; | WECC | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | Cyber Event | 0 | 0 | Cyber Attack |
| March | 2023-03-23 | 11:37 AM | 03/23/2023 | 11:38 AM | Texas: Tarrant County; | TRE | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-23 | 12:39 AM | 03/23/2023 | 12:40 AM | Nevada: Clark County; | WECC | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Actual Physical Attack/Vandalism | 24 | 11479 | Physical Attack |
| March | 2023-03-25 | 4:13 PM | 03/27/2023 | 6:30 PM | Michigan: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | 5800 | 67893 | Weather |
| March | 2023-03-25 | 4:12 PM | Unknown | Unknown | Ohio: West Virginia: Virginia: | RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 160801 | Weather |
| March | 2023-03-26 | 12:52 PM | 03/26/2023 | 1:54 PM | Washington: Oregon: Josephine County; California: Idaho: Utah: Wyoming: Montana: | WECC | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Vandalism | 34 | Unknown | Physical Attack |
| March | 2023-03-28 | 6:03 PM | 03/28/2023 | 8:08 PM | Texas: Cameron County; | TRE | Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. | Suspicious Activity | 0 | 0 | Physical Attack |
| March | 2023-03-28 | 5:22 AM | 03/28/2023 | 6:57 AM | Texas: Montgomery County; | TRE | Unplanned evacuation from its Bulk Electric System control center facility for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2023-03-28 | 10:05 AM | Unknown | Unknown | Texas: Hartley County; | TRE | Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-29 | 5:26 AM | 03/29/2023 | 7:23 AM | Nebraska: Kearney County; | MRO | Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing). | System Operations | 0 | 0 | Operations |
| March | 2023-03-29 | 5:37 PM | 03/29/2023 | 7:15 PM | Wisconsin: Michigan: | MRO / RF | Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more. | System Operations | 0 | 0 | Operations |
| March | 2023-03-30 | 9:13 AM | 03/30/2023 | 9:15 AM | Washington: Kitsap County; | WECC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-30 | 6:28 PM | 03/30/2023 | 10:13 PM | Colorado: Larimer County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | 18 | Unknown | Transmission Interruption |
| March | 2023-03-30 | 9:40 AM | 03/30/2023 | 10:00 AM | Kentucky: | SERC | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 0 | 0 | Physical Attack |
| March | 2023-03-30 | 7:21 PM | Unknown | Unknown | Colorado: Larimer County; | WECC | Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system | Transmission Interruption | Unknown | Unknown | Transmission Interruption |
| March | 2023-03-30 | 5:00 AM | 03/30/2023 | 2:20 PM | Pennsylvania: Indiana County; | RF | Damage or destruction of its Facility that results from actual or suspected intentional human action. | Vandalism | 1711 | 0 | Physical Attack |
| March | 2023-03-31 | 6:00 PM | 03/31/2023 | 8:45 PM | Arkansas: | SERC | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 58368 | Weather |
| March | 2023-03-31 | 11:00 PM | 04/01/2023 | 4:15 PM | Minnesota: Ramsey County, Hennepin County, Dakota County, Washington County; | MRO | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 80000 | Weather |
| March | 2023-03-31 | 8:49 PM | Unknown | Unknown | Illinois: | SERC / RF | Loss of electric service to more than 50,000 customers for 1 hour or more | Severe Weather | Unknown | 65000 | Weather |