By late Thursday, power had been restored to thousands in California's San Diego and Orange counties, though more than a million people were still without power, the company said. Officials warned it would take until at least Friday to restore power in portions of San Diego and Orange counties. The power outage shut down two reactors at the San Onofre Nuclear Generating Station near San Clemente, California, authorities said. At the height of the power outage, San Diego Gas & Electric said all of its 1.4 million customers were without power. Power outages in California stretched from San Clemente in Orange County to the state's border with Mexico. In Arizona, about 56,000 customers in Yuma lost power, Arizona Power and Supply said.
Source :
http://www.news24.com/World/News/Millions-left-without-power-in-US-Mexico-20110909
http://www.cnn.com/2011/US/09/09/california.power.outages/