A rundown of the expected numbers of customers in each county and city that will lose power is available on PG&E’s website.

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“The safety of our customers and the communities we serve is our most important responsibility, which is why PG&E has decided to turn power off to customers during this widespread, severe wind event,” PGE senior vice president of Electric Operations Michael Lewis said in a statement on the utility’s website. “We understand the effects this event will have on our customers and appreciate the public’s patience as we do what is necessary to keep our communities safe and reduce the risk of wildfire.”

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“It’s absolutely unprecedented,” Sonoma County spokeswoman Maggie Fleming told the Journal. “We are encouraging people to keep their cellphones charged, have gas in their cars, cash in hand and nonperishable food.”

Climate change has been a massive driver of the wildfires in California, with both drought and autumn drying trends expected to become more severe, literally fueling massive blazes. UCLA climate scientist Daniel Swain told Wired that in recent years, wildfires are “burning much more land and they’re burning hotter, more intensely. And there’s a lot of anecdotal, verging on systematic, evidence that these fires are behaving differently. In the initial hours these fires are becoming explosively large much faster than they did historically.”

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Another factor is increasing human settlement in areas prone to wildfires, which increase both the number of fires sparked by human activity and puts more residents and property right in the path of the blazes. California has also faced accusations of poor forest management, including a failure to perform an adequate number of controlled burns that could thin out potential fuel sources.