PG&E says it began notifying customers Sunday night via text, email and automated phone calls. The company adds that customers can look up their address online to find out whether their location is being monitored for the potential shutoff.
Affected areas lie in the Sierra Nevada foothills, the North Coast, the northern Sacramento Valley and the North Bay mountains.
See the number of customers who may be affected in each county in the table below. Customers enrolled in the Medical Baseline Program, which offers lower energy rates for older people and people with disabilities who need extra power to operate ventilators, dialysis machines or mechanized wheelchairs and may be affected by the shutoffs, are also listed.
PG&E equipment has been responsible for some of the deadliest and most destructive wildfires in modern California history, including the 2018 Camp Fire, which killed 85 people in and around the Butte County town of Paradise.
PG&E said in a report filed with state utility regulators in mid-July that Cal Fire was investigating the company's equipment as the possible cause of the Dixie Fire, which has burned more than 604,000 acres, or about 944 square miles, as of Tuesday morning.
Find more information about PG&E power shutoffs, including KQED's resources on how to prepare for one, here.