(BCN) -- High winds and dry conditions during the heat wave that's toasting the Bay Area this week may bring public safety power shutoffs for customers in four counties around the region, the power agency said Monday. Those notified of possible power shutoffs include 286 customers in Contra Costa County, 140 in Napa County, 57 in Alameda County and 11 in Sonoma County, according to PG&E spokesperson Tamar Sarkissian. SF temps could reach 90s this week as officials issue Heat Advisory, possible power shutoffs "We continue to monitor the weather in those areas," Sarkissian said. The power shutoffs could take effect between 6 p.m. Monday and 11 a.m. Tuesday. Nearly 10,000 customers in some Northern California counties are already undergoing power shutoffs due to the ongoing heat wave affecting a large portion of California. Most are in Shasta County, where nearly 8,000 customers are affected, Sarkissian said. Copyright © 2024 Bay City News, Inc.