New rolling blackouts in parts of California were ordered Saturday night as power shortages continued because of an extreme heat wave.

Pacific Gas & Electric Co. said Saturday night it was beginning to rotate power outages affecting up to 250,000 customers in Northern and Central California. San Diego Gas & Electric said it also interrupted power to some customers but had restored all service by 7 p.m.

The Los Angeles Department of Water and Power said that 3,800 customers were without power late Saturday in the San Fernando Valley and that it could be four to 12 hours before electricity was restored. The affected areas included West Hills, Arleta, Granada Hills and Studio City.

Southern California Edison issued a warning to customers that rotating power outages might be called in its Los Angeles County service area through midnight. It said outages could last up to one hour.

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