Fire Chief Ralph Terrazas says the fire broke out around 9 p.m. Thursday and exceeds 7 square miles (18 square kilometers) Friday morning.
At least 25 homes have been damaged so far.
Another death has been confirmed at the scene of wildfires in Southern California.
The Saddleridge Fire began Thursday night near Sylmar and grew by thousands of acres overnight.
The outages, aimed at reducing the risk of fires during strong winds, will last up to a week for some customers. "This is going to take a few days", Terrazas said during a Friday morning news briefing, adding that the fire was still zero per cent contained. The officials did not provide details about those cases.
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A cause has not been determined.
The so-called Saddleridge Fire started Thursday night around 9:00 p.m. local time along the northern rim of the San Fernando Valley and nearly immediately exploded from 60 acres to over 4,000 acres (1,619 hectares) overnight - jumping across the 210 and 5 freeways.
A commercial building was destroyed by the blaze, called the Saddleridge Fire, authorities reported. "We went into an aggressive offensive attack while simultaneously setting up our structure protection".
"Super scoopers and the Sky Crane are in operation this morning", LAFD said.
210 Cramped-access highway in both directions between the 118 and 5 Freeways.
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A time exposure shows embers from the Saddleridge Fire blown by the wind in the Porter Ranch section of Los Angeles on October 11.
NWS warns that windy, dry conditions will bring the "potential for very rapid fire spread, long range spotting, and extreme fire behavior". The Sylmar and Northridge recreation centers are accepting those who were evacuated, along with small pets.
Up in the north of the state this week, power company PG&E cut electricity to parts of 22 counties, including portions of the San Francisco Bay Area, as a wildfire prevention method.
The risk to life and property prompted Pacific Gas and Electric Co. cut power to about 730,000 customers, a move that California Gov. Gavin Newsom blamed on years of mismanagement by the utility.
Because of the risky weather in the forecast, PG&E cut power Wednesday to an estimated 2 million people in an area that spanned the San Francisco Bay Area, the wine country north of San Francisco, the agricultural Central Valley and the Sierra Nevada foothills.
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