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Pacific Gas & Electric is cutting service for as many as 800,000 customers in 34 counties over fire danger from high winds forecast for today and tomorrow. The utility anticipates that it will begin turning power back on starting Thursday, when winds subside, but it could take as long as five days to check all the lines.

Our San Francisco bureau chief, Thomas Fuller, is giving us live updates.

See more coverage from the Chico Enterprise-Record, Half Moon Bay Review, KQED, The Mercury News, Napa Valley Register, The Press Democrat, The Sacramento Bee, the San Francisco Chronicle and more.

Why is PG&E shutting off power?

It is the most extreme precaution the utility has taken to prevent wildfires after its equipment was determined to have sparked dozens of blazes in recent years. It is now peak wildfire season in the state, and a combination of strong winds and low humidity have created conditions for potentially catastrophic fires.

[Read more: How PG&E ignored fire risks in favor of profits.]

Where are the PG&E power outages?

Check if your address falls in a shut-off zone with these interactive maps from the San Francisco Chronicle and The Los Angeles Times. (You can also take a closer look in this Mercury News map.)