Large areas of Northern California remained without power on Thursday as a major outage rocked the region for a second day. About 600,000 electricity customers were affected on Thursday morning after the state’s largest utility carried out the second phase of its intentional power cut.

Pacific Gas and Electric said extreme winds overnight forced the additional shutdown, which the utility organized to prevent equipment from sparking fires.

The second phase affected bedroom communities in the San Francisco Bay Area and added to the hundreds of thousands of customers who had lost power on Wednesday. As of Thursday morning, the company had restored power to 137,000 customers.

PG&E Public Safety Power Shut-Offs in California

As of 2:15 p.m. Pacific on Thursday.

But other customers may be without electricity for several more days, said Melissa Subbotin, a spokeswoman for the company. High winds in some areas were not forecast to subside until Friday, she said.

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