DCist and other news sources are reporting that there’s a power outage and water main break in Columbia Heights. The power outage is at 13th and Harvard NW; the water main at 13th and Florida NW. Keep in mind 13th is currently closed between Belmont and Florida.
There’s also been another power failure near Navy Yard, at 9th and Virginia SE. Not a lot of details I’ve seen on it (post anything new in comments!); all I can say is, with this humidity and another 90 degree day, try to stay cool somehow.