1.4 million without power; electricity may not be fully restored until Friday [Updated]
San Diego Gas and Electric said the outage appears to have originated in Arizona and that the agency is working with California power officials to bring the power back. Officials said the outages extended across Southern California and into Arizona and Baja California.
The loss of power led to a shutdown of two reactors at the San Onofre nuclear power plant.
Gil Alexander, a spokesman for Southern California Edison, said the power outage did not cause any safety issues. Alexander said a fluxation in power caused the reactors to shut down at 3:38 p.m. but that the overall plant continues to have power.
He said the system worked as it was supposed to during a loss of power.
Across San Diego, businesses are closed, traffic is snarled and the trolley system is down. San Diego International Airport was on backup generators.
The city of San Diego has set up its emergency operations center.
Sheriff's officials told Fox 5 San Diego that many of its substations were without power. Utility officials are trying to figure out what cause the outage.
--Ruben Vives and Andrew Blankstein
Image: Screenshot of San Diego Gas and Electric's tweet to its customers