Pacific Gas & Electric and Southern California Edison on Tuesday raised the number of its customers who may be without power from 600,000 to nearly 800,000, affecting 34 northern, central and coastal counties, starting with counties in the north just after midnight Wednesday morning.
Here are some questions and answers about the outage.
With strong winds forecasted in the coming days - winds that threaten to knock down trees and topple power lines - PG&E announced it would be cutting power to 800,000 customers across northern and central California.
The utility firm said: 'Due to the forecasted extreme weather conditions, PG&E is considering proactively turning off power for safety, and implementing a Public Safety Power Shutoff, across portions of approximately 30 northern, central, coastal and Bay Area counties'.
Faced with customer anger, PG&E put up barricades around its San Francisco headquarters.
To avoid being blamed for another wildfire, some utilities have chose to cut power during high winds when the fire risk is elevated.
About 126,000 customers had service restored as weather conditions improved, the company said. Its website, where people could check whether their addresses would be affected, was down Tuesday afternoon after being overloaded with visitors.
The National Weather Service also issued a fire weather watch for the Santa Cruz Mountains as well as the North Bay and East Bay valleys. Major utilities in Los Angeles and San Diego warned they could be forced to cut off power to an estimated half-million people. The University of California, Berkeley, Sonoma State University and Mills College canceled classes Wednesday.
Turkish military, Syrian rebel forces to cross into Syria 'shortly': Erdogan's aide
But the Turkish government views them as a terrorist insurgency linked to the Marxist Kurdistan Workers' Party (PKK). Erdogan, however, sees the Kurds as terrorists and a threat along Turkey s southern border.
There are different figures circulating about how many people are impacted by all of this. "We don't want any more fires, obviously, but I feel like they are going a little overboard".
They include restrooms, bottled water, electronic-device charging, air-conditioned seating.
Pacific Gas and Electric spokesman Mark Mesesan said Wednesday it may take days to restore power because power lines and equipment must be checked before being re-energized.
At the Basque Boulangerie Cafe, workers used battery-powered lights and kept track of cash-only sales by listing them on a sheet of paper.
Oakland Mayor Libby Schaaf asked residents not to clog 911 lines with non-emergencies.
As it faces tens of billions of dollars in liabilities after an investigation determined its power lines caused the November 2018 Camp Fire, which killed 85 people and destroyed almost 14,000 homes. The power was left on in one San Jose neighborhood until high winds knocked down a line sparking a small fire.
The power will be turned off to communities in stages, depending on local timing of the severe wind conditions, beginning with counties in the northern part of the state, according to PG&E.
On Oct. 8, the city sent out another email notifying residents that Morgan Hill Unified Schools are planning to remain open.