Power back on for 1.4 million San Diego customers

Deborah Springs shops in a convenience store for food items after a power outage Thursday, Sept. 8, 2011, in San Diego. A power outage is affecting millions of people across southern California, Arizona and Mexico. San Diego Gas & Electric Co. Darcel Hulce said that crews Thursday believe the outage was caused by a system breakdown and assured people it was not the result of a terror attack. (AP Photo/Gregory Bull)

September 9, 2011 6:27:11 AM PDT
San Diego Gas & Electric has restored power to all 1.4 million of its customers who lost electricity in a major blackout.

The utility made the announcement a day after a large swath of the Southwest and parts of Mexico lost electricity, and restoration of power came sooner than expected.

Most of the people affected were San Diego Gas & Electric customers.

Officials at Phoenix-based Arizona Public Service Co. says the outage occurred after an electrical worker removed a piece of monitoring equipment at a substation.

The blackout also caused a sewage spill that closed some San Diego-area beaches. All public schools in the city also are closed Friday as well as local state universities and community colleges.

It's still unclear how many power customers elsewhere are still without power.