PG&E, Californiaâs largest utility provider, has warned upwards of around 32,000 customers in northern and central parts of the Golden State that they could see their power shut off in an effort to reduce the wildfire risk from energized equipment and power lines. Customers in Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, El Dorado, Fresno, Glenn, Lake, Madera, Mariposa, Mendocino, Merced, Monterey, Napa, Nevada, Placer, Plumas, San Benito, San Luis Obispo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Solano, Sonoma, Stanislaus, Tehama, Tuolumne and Yolo counties could all be affected by power outages.