Earlier Friday evening, PG&E was directed by California Independent System Operator (ISO) to initiates rotating outages throughout the state.
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The Stage 3 Emergency declaration was called after extreme heat drove up electricity demand across California, causing the ISO to dip into its operating reserves for supply to cover demand.
PG&E says due to the emergency it was unable to notify customers in advance of the rotating power outages, which impacted customers in the following counties: El Dorado, Marin, Napa, San Mateo and Sonoma.
RELATED: What is a Flex Alert?
Earlier this week the state issued a Flex Alert, warning residents that this week's heat wave could put a strain on the state's power grid.
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For the latest on PG&E outages across the Bay Area click here.
Watch the latest AccuWeather forecast and take a look at recent weather stories and videos.
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