Updated on Sunday at 1:29 p.m.
Due to fierce winds expected across Northern and Central California Saturday night, PG&E is preemptively cutting power to approximately 940,000 customers in an effort to prevent destructive fires.
The blackouts will affect roughly 90,000 more customers than previous estimates by the utility. More than 2.5 million people total could be without power.
PG&E said the outages will affect parts of every county in the Bay Area except for San Francisco.
Weather forecasts predict dry, hot and windy weather to hit the region between 6 p.m. and 10 p.m. Saturday and last through Monday afternoon.
The power shutoffs are happening in six phases, but the utility previously warned shutoff times may change depending on weather conditions.
The first shutoffs were expected as early as 2 p.m. on Saturday, but were delayed, according to PG&E during a press conference Saturday night. The utility said it shut off power in areas of the Northern Sierra Foothills, Northern Sacramento Valley and the North Bay at 5 p.m.
PG&E estimates power shutoffs in the East Bay, South Bay and Peninsula to begin at 8 p.m. on Saturday, which were previously scheduled for 5 p.m.

