A power cut has caused blackouts in Mexico and in the US states of California and Arizona.
Almost 5 million people were left without power in the overnight blackout and officials said many residents may be out of service for a day or more.
The cut, apparently triggered by an employee who carried out a procedure at a substation in Arizona, caused traffic congestion on Southern California freeways, knocked out water supplies in parts of San Diego County and Tijuana and sent some elderly residents to emergency rooms.
San Diego International Airport canceled all outbound flights, traffic came to a standstill as the city's street lights quit and about 70 people had to be rescued by the city's fire department from stalled elevators.
San Diego schools were ordered closed until Monday as utilities could not guarantee they would be able to turn on the lights in classrooms.
"There was a very major outage, a region-wide outage," San Diego Gas and Electric President Mike Niggli said. "There's no doubt this has never happened before to our system." But police in California's second-largest city, located between Los Angeles and the Mexican border, reported no major problems, and hospitals successfully switched to backup power, the Scripps Health chain said.
The procedure in Arizona first caused the failure of a high-power line supplying electricity to Southern California before unleashing a domino effect across the Southwest, officials said.
That in turn led to a blockage at California's San Onofre nuclear energy plant, a second major source of power to the San Diego area, San Diego Gas and Electric said.
San Diego Gas and Electric said in a tweet that all 1.4 million of its customers in the San Diego area were without power. Blackouts also affected 3.5 million people in Baja California, according to local emergency services and state authorities.
The city of Yuma, Arizona, reported that more than 50,000 people had lost power.
By early evening, crews had restored service in the section of the line that triggered the massive event and had begun to restore power to parts of San Diego County.
Electricity returned late lastnight to the central San Diego neighborhood of Normal Heights, where many families earlier in the evening had embraced the darkness by throwing outdoor barbecue parties on their front lawns.
By 11pm, San Diego Gas and Electric reported that power was restored to 165,000 customers in San Diego and Orange counties. But the utility warned that all power would not be restored overnight and urged customers to conserve energy.
Mexico's Federal Electricity Commission said 180,000 customers had been brought back online in Baja California. The commission said it was making progress in getting power back on in state capital Mexicali, Ensenada and Rosarito.
Reuters