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Pacific Gas & Electric began shutting off power in 34 California counties early Wednesday Oct. 9. The shutdowns started in Northern California and Marin County shortly after midnight, and were expected to begin in the rest of the Bay Area around noon on Wednesday.

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In all, nearly 800,000 PG&E customers may be affected by the outage, which could last for days in some cases.

In the Bay Area, portions of San Mateo, Santa Cruz, Santa Clara, Alameda, Contra Costa, Marin, Solano, Sonoma and Napa counties are affected.

The approximate boundaries of the potential outage are shown on the map above.

Besides the Bay Area, the notice covers portions of the counties of Alpine, Amador, Butte, Calaveras, Colusa, El Dorado, Glenn, Humboldt, Lake, Mariposa, Mendocino, Nevada, Placer, Plumas, San Joaquin, Shasta, Sierra, Siskiyou, Stanislaus, Tehama, Trinity, Tuolumne, Yolo and Yuba.

PG&E says the map information should be considered a “general guideline.” For the latest updates or to check whether a specific address is expected to be affected, go to PG&E’s website. The utility will also attempt to notify customers before their electricity is cut.

The planned shutoff was prompted by heightened fire risk amid expected dry and windy conditions on Wednesday.

(Karl Mondon/Bay Area News Group) LARKSPUR, CA - Oct. 9: The sun rises in Larkspur, Calif., behind an electrical transmission tower, Wednesday, Oct. 9, 2019, on the first day of PG&E's planned safety power outage. (Karl Mondon/Bay Area News Group)

San Jose deputy city manager Kip Harkness speaks during a news conference to address Pacific Gas and Electric Company's planned power shutdown from City Hall in San Jose, Calif., on Wednesday, Oct. 9, 2019. PG&E is expected to begin shutting down power to parts of East San Jose along the Foothills, Alum Rock and Almaden in the South by noon Wednesday. (Anda Chu/Bay Area News Group)

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Evergreen Valley College closed its campus due to potential PG&E power shutdown in San Jose, Calif., on Wednesday, Oct. 9, 2019. A sign was placed at the entrance of the college to notify students. (Randy Vazquez/Bay Area News Group)



OAKLAND, CA - OCTOBER 09: McCaulou's Department Store manager Mahamh Lopes stocks merchandise in the Montclair District of Oakland, Calif., on Wednesday, Oct. 9, 2019. Power was supposed to go out at noon in Montclair, but the PG&E shutoff was delayed until later in the evening. (Jane Tyska/Bay Area News Group)

OAKLAND, CA - OCTOBER 09: Cars line up for fuel at the Mash gas station in the Montclair District of Oakland, Calif., on Wednesday, Oct. 9, 2019. Power was supposed to go out at noon in Montclair, but the PG&E shutoff was delayed until later in the evening. (Jane Tyska/Bay Area News Group)

LARKSPUR, CA - Oct. 9: The sun rises in Larkspur, Calif., behind an electrical transmission tower, Wednesday, Oct. 9, 2019, on the first day of PG&E's planned safety power outage. (Karl Mondon/Bay Area News Group)



OAKLAND, CA - OCTOBER 09: Barber Daniel Tran cuts Marcelo Altieri's hair at Montclair Barbers in the Montclair District of Oakland, Calif., on Wednesday, Oct. 9, 2019. Power was supposed to go out at noon in Montclair, but the PG&E shutoff was delayed until later in the evening. (Jane Tyska/Bay Area News Group)

OAKLAND, CA - OCTOBER 09: An Oakland police vehicle carries cones for traffic control in the Montclair District of Oakland, Calif., on Wednesday, Oct. 9, 2019. Power was supposed to go out at noon in Montclair, but the PG&E shutoff was delayed until later in the evening. (Jane Tyska/Bay Area News Group)

SAUSALITO, CA - Oct. 9: A sunrise tapestry glows in Ondine's Restaurant on Bridgeway in Sausalito, Calif., Wednesday, Oct. 9, 2019, while other parts of town awaken to no power as PG&E implements their planned outage. (Karl Mondon/Bay Area News Group)



San Jose Vice Mayor Charles "Chappie" Jones speaks during a news conference to address Pacific Gas and Electric Company's planned power shutdown from City Hall in San Jose, Calif., on Wednesday, Oct. 9, 2019. PG&E is expected to begin shutting down power to parts of East San Jose along the Foothills, Alum Rock and Almaden in the South by noon Wednesday. (Anda Chu/Bay Area News Group)

Commuters travel through a darkened Robin Williams Tunnel on Highway 101 in Sausalito, Calif., Wednesday morning, Oct. 9, 2019, after PG&E's planned power outage was implemented in parts of Marin County. (Karl Mondon/Bay Area News Group)

SAUSALITO, CA - Oct. 9: A cyclist pedals along the darkened Bridgeway in Sausalito, Calif., past the Bridge Road intersection where traffic signals are inoperative after a planned PG&E power outage, Wednesday, Oct. 9, 2019. (Karl Mondon/Bay Area News Group)



SAN FRANCISCO, CA - Oct. 9: San Francisco's skyline glows brightly, Wednesday morning, Oct. 9, 2019, even as much of the state awakens to no electrical power following PG&E's planned safety power outage. San Francisco is the only one the nine Bay Area counties not affected by the outages. (Karl Mondon/Bay Area News Group)



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