LOS ANGELES — California’s biggest utility admitted its electrical equipment may have ignited a destructive wildfire spreading through the state’s wine country Friday, despite blackouts imposed across the region to prevent blazes.

The disclosure came as firefighters battled flames in both Northern California and Southern California: the fire amid Sonoma County’s vineyards, and a wind-whipped blaze that destroyed homes near Los Angeles.

The fire near the Northern California town of Geyserville burned at least 49 buildings and 34 square miles, and prompted evacuation orders for some 2,000 people.

It was driven by the strong winds that had prompted Pacific Gas & Electric to impose sweeping blackouts affecting a half-million people in Northern California and Central California. Power was restored to most people by Thursday evening, PG&E said.

PG&E resorted to shut-offs after equipment malfunctions and trees blowing into power lines were blamed for sparking several blazes in recent years that killed scores of people, burned thousands of homes and ran up billions of dollars in claims that drove the utility into bankruptcy.

However, PG&E said Thursday it didn’t turn off a 230,000-volt transmission line near Geyserville that malfunctioned minutes before the fire erupted. The utility reported finding a “broken jumper” wire on a transmission tower on Wednesday night.

PG&E CEO Bill Johnson said it was too soon to know if the faulty equipment sparked the fire. He said the tower had been inspected four times in the past two years and appeared to have been in excellent condition.

Investors were leery, though, and PG&E stock fell more than 20% during the day.

In shutting off the electricity, PG&E cut power to the distribution lines that supply homes, but not to its long-distance transmission lines.

Meanwhile, an estimated 50,000 people were under evacuation orders in the Santa Clarita area north of Los Angeles as hot, dry Santa Ana winds howling at up to 50 mph drove the flames into neighborhoods.

The cause of the fire was unknown, but Southern California Edison said it had cut off power to the area five hours before it broke out Thursday afternoon.

At least six homes were burned, and officials said the number was expected to rise as they took a more thorough look.

“I’m literally seeing sticks and fire of what used to be our home,” Alejandro Corrales said.

She said the fire also took her mother’s ashes, other belongings and possibly a pen full of pet sheep.

“Everything in the house is gone,” Corrales said.

Firefighters on the ground and in the air struggled to protect homes surrounded by trees and brush as the fire grew to 4,300 acres.

Some residents tried to fight the blaze with garden hoses. People rushed to rescue dozens of horses, donkeys, goats, a pig and an emu.

High winds were expected to taper off by late afternoon. Southern California Edison, which shut off electricity to more than 31,000 customers on Thursday, said it was considering additional power cuts to more than 386,000.

The Los Angeles school district closed all its schools in the San Fernando Valley, citing poor air quality and other safety concerns.

While the high winds in Northern California had died down by Friday, they were expected to pick up over the weekend with gusts of 40 to 60 mph in many places, and PG&E warned it may black out an even larger region.

PG&E chief meteorologist Scott Strenfel said Northern California could be in for the strongest offshore winds in years.

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