Even the White House is not immune to power outages.
Dec. 15, 2014: Power outages at White House and other government offices
Weekly Standard: Lights Go Out (Briefly) at White House
CNN: Power Outages Hit White House, Federal Buildings in D.C.
April 7, 2015: Power outages hit Washington D.C. area
Time: Washington Power Outage Hits White House
ABC News video: White House Complex Minimally Impacted by Power Outage