More than 4,100 Pepco customers in the northwest area of the District were without power Friday morning.
Pepco said there was a problem at the 10th Street Northwest substation. The source of the problem appears to be an underground line connected to the station.
Crews have been dispatched to the station. They are trying to isolate the problem.
Pepco estimated that power will be restored to all customers at about 11 a.m.