SAN FRANCISCO — Pacific Gas & Electric Co. power lines may have started two wildfires over the weekend in the San Francisco Bay Area, the utility said, even though widespread blackouts were in place to prevent downed lines from starting fires during dangerously windy weather.

The fires described in PG&E reports to state regulators match blazes that destroyed a tennis club and forced evacuations in Lafayette, about 20 miles (32 kilometers) east of San Francisco.

The fires began in a section of town where PG&E had opted to keep the lights on. The sites were not designated as a high fire risk, the company said.

Nearly 2.5 Million Lost Power

Powerful winds drove multiple fires across California and forced power shut-offs intended to prevent blazes. More than 900,000 power customers — an estimated 2.5 million people — were in the dark Monday, nearly all of them in PG&E’s territory in Northern and Central California.

Southern California Edison had cut off power to 25,000 customers and warned that it was considering disconnecting about 350,000 more.

PG&E is under severe financial pressure after its equipment was blamed for a series of destructive wildfires during the past three years. Its stock dropped 24 percent Monday to close at $3.80 and was down more than 50 percent since Thursday.

The company reported last week that a transmission tower may have caused a Sonoma County fire that has forced nearly 200,000 people to evacuate.

Utility Reports Incidents to Regulators

PG&E told the California Public Utilities Commission that a worker responded to a fire in Lafayette late Sunday afternoon and was told firefighters believed contact between a power line and a communication line may have caused it.

A worker went to another fire about an hour later and saw a fallen pole and transformer. Contra Costa Fire Department personnel on site told the worker they were looking at the transformer as a potential ignition source, a company official wrote.

Separately, the company told regulators that it failed to notify 23,000 customers, including 500 with medical conditions, before shutting off their power earlier this month during windy weather.

Before a planned blackout, power companies are required to notify customers and take extra care to get in touch with those with medical problems who may not be able to handle extended periods without air conditioning or may need power to run medical devices.

PG&E said some customers had no contact information on file. Others were incorrectly thought to be getting electricity.

After that outage, workers discovered 43 cases of wind-related damage to power lines, transformers and other equipment.

Jennifer Robison, a PG&E spokeswoman, said the company is working with independent living centers to determine how best to serve people with disabilities.

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