More than 250,000 Pacific Gas & Electric customers in the Bay Area will lose power starting Wednesday as the utility company plans to preemptively shut down power to mitigate wildfire risks.

On Tuesday afternoon, the utility announced will shut off power to 800,000 customers in Northern and Central California starting early Wednesday. PG&E said it would notify affected customers directly.

An interactive map on PG&E’s website shows wide swaths of the Bay Area that will be affected by a PSPS,