Thousands of PG&E customers in Berkeley lost power tonight, a PG&E spokeswoman said.
The outage began at around 8 p.m. when 12,425 customers lost their power, PG&E spokeswoman Jana Morris said.
PG&E crews responded to a substation in Berkeley believed to be where the outage began to try and determine the cause of the outage.
By about 10:30 p.m. the number without power had dropped to about 642, Morris said.
However at 11:30 pm PG&E reported on its web site that in the Berkeley area there were 10 outages affecting 9998 customers.
Workers have not yet determined the cause of the outages, and no estimate for restoration was available.