PG&E reported several large power outages across the Bay Area on Wednesday as a wet and windy storm moved through Northern California.

The utility company said a fire at its Saratoga substation broke out at about 8:25 a.m., initially impacting about 21,000 customers in Santa Clara County. 

There was no immediate word on the cause of the fire. It extinguished on its own before fire crews arrived, according to PG&E.

"We have to do the forensics because the equipment was damaged by the fire," said PGE spokesperson Stephanie Magallon. "We have to figure out what the root cause was before we can say if it was weather-related or not, but we do know it was an equipment failure."

At 4 p.m., PG&E said power had been restored to several thousand customers, leaving 18,834 customers without electricity. There were 3,395 without power in the Peninsula, 13,511 in the North Bay, 87 in the East Bay and 1,836 in the South Bay.

San Francisco had about five customers still without power on Wednesday, four days after a massive outage that left 130,000 PG&E customers without electricity. 

A high wind warning and wind advisory were in effect for most of the Bay Area through Wednesday morning. 

Downtown Saratoga businesses on Big Basin Way, including Anchors Fish & Chips & Seafood, say the power went out early, but glad it was restored in time for lunch.

Mei Huang and her husband have served up steaming hot bagels for 30 years at Saratoga Bagels. They didn't lose electricity this time, but know very well how painful it can be for their bottom line, especially during the holiday rush.

"A lot of food, the whole freezer had to be thrown out. That's no fun," said Huang.

Varna Chandar, who's back home for the holidays, says her electricity in San Francisco got knocked out last weekend. She's hoping the next windstorm doesn't shut off the Christmas lights.

"It would be really sad if the power is out during Christmas Day or even today during Christmas Eve, because me and my family and friends are planning to do a lot of things at home," said Chandar.

Small businesses like Saratoga Bagels are banking on the power to stay on.

"We want to make sure we're open every day, because I see a lot of people coming back from home," said Huang.

PG&E said the investigation into the fire at the Saratoga substation was ongoing.