The Southern California blackout was triggered after a 500-kilovolt high-voltage line from Arizona to California tripped out of service, officials said Thursday afternoon.
The transmission outage severed the flow of imported power into areas of Southern California, said California Independent System Operator, known as ISO, which oversees the state's electrical grid.
Full Coverage: Southern California blackouts
Officials at ISO said they were working with utilities in Southern California, Arizona and Mexico to restore power. Officials said the blackouts could last for hours.
The widespread outages have darkened homes and stores and caused massive traffic jams across Southern California.
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