Authorities were investigating extensive power outages in southern California, Arizona and Mexico on Thursday that left more than 1 million customers without power, caused traffic jams and prompted at least one county to activate its emergency operations center.
San Diego Gas & Electric said the problem appeared to have originated in Arizona. At least 1.4 million customers were without power, the utility said.
"This caused our line from AZ and from the north of our region to both trip off," the utility posted on its Twitter account.
"Think of the system as linked by springs, when one part goes out the rest are affected," another Twitter post from the utility said.
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