Almost 700 homes in Sunderland were left without electricity following a power cut.
Northern Powergrid said a total of 680 properties in the Leechmere area, the SR2 postcode, lost power just before 6.50pm yesterday.
This was due to a generator problem.
All properties had power restored by 2.20am today.
A spokeswoman for Northern Powergrid said: "We lost supply to 680 properties at around 6.48pm yesterday.
"We managed to get power back on at the last remaining properties by 2.20am today."