BERKELEY (CBS SF) — A large-scale power outage affected over 7,000 customers in Berkeley and smaller outages affected thousands in other cities, according to PG&E.

At 9:20 p.m. Tuesday evening, 11,912 customers were still being affected. The full breakdown by region follows below:

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  • San Francisco – 11
  • Peninsula – 1,035
  • North Bay – 1,414
  • East Bay – 8,725
  • South Bay – 727
  • Bay Area Total – 11,912

On PG&E’s electric outage report map, an area of Berkeley south of the UC Berkeley campus was reported to be affecting 7,363 customers. The outage began at 3:57 p.m., the map said.

PG&E said they are investigating the cause of the outage. The utility estimates that power will be restored to the affected area by 7:15 p.m. Tuesday evening.

By 5:45 p.m., the outage map indicated that most of the power had been restored in the area.

Two outages in Benicia were affecting 5,830 customers around 6:30 p.m. The utility estimated power would be restored by 9:30 p.m.

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In the East Bay, three separate outages in Orinda and Lafayette were affecting around 2,286 customers, according to the outage map. Those outages also began shortly before 4 p.m. Tuesday.

Another outage in Livermore that began at 4:26 p.m. was affecting 1,886 customers. PG&E said the outage was caused by the weather.

In Vallejo, just northeast of Six Flags Discovery Kingdom, an outage was affecting 992 customers. Power was estimated to be restored by 6:15 p.m., PG&E said.

Two outages in Fairfield were affecting over 2,290 customers and started around 4 p.m.

A statewide Flex Alert was issued Tuesday by the California Independent System Operator Corporation, calling for voluntary electricity conservation from 4 p.m. to 10 p.m. Tuesday.

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Customers were urged to conserve electricity during the hot Tuesday afternoon, a time when air conditioners are typically at peak use. Because of the widespread use of the appliances, ISO said it anticipates energy demand reaching a peak of 42,8000 megawatts Tuesday evening.