The shutoff starts at 2:30 am in Butte, Nevada, Placer, Plumas and Yuba Counties. In the North Bay, PG&E decided against large shutdowns because of improving weather conditions.
But at 4:30 am, 708 customers are due to lose power near Calistoga, Napa, and the northern end of Lake Berryessa. And In Sonoma County, 711 customers near Santa Rosa along Porter Creek Road will be affected.
Go here to see a map of the areas affected.
RELATED: PG&E launches website to warn about preemptive shutoffs
The power shutoff is in response to high fire danger in the area caused by weather.
Three North Bay cities have opened cooling centers because of the hot temperatures-- and they'll be open again Wednesday in Santa Rosa, Petaluma, and Windsor.
The Bay Area is under a red flag warning that has been extended through Wednesday and officials are asking people to be careful and help prevent any potential fires.