Nearly 1,000 properties in Surrey were left without power after thieves tried to steal high voltage roadside cable from the electricity network.
UK Power Networks said the incident, in the Thorpe Park area of Chertsey, happened at 1316 GMT on Saturday.
Damage caused during the attempted theft cut power to 933 customers.
Engineers restored electricity to 857 premises at 1404 GMT and a further 71 at 1516 GMT. Power was restored to the remaining five at 2132 GMT.
A spokesman for UK Power Networks said it was helping police investigate the attempted theft.
"We understand how difficult it is to be without power and would like to apologise for the inconvenience caused," he said.