Pacific Gas and Electric Company Terminates Alert at Diablo Canyon Power Plant

(June 23, 2010)

SAN LUIS OBISPO, Calif. – At 5:15 PM, Pacific Gas and Electric Company terminated an alert at Diablo Canyon Power Plant. The alert was declared this morning due to a buildup of carbon dioxide during a planned test of a fire suppression system.

The utility, with support from Cal Fire, ventilated the Unit 1 main lube oil room to reduce the carbon dioxide discharge to habitable levels.

The utility, with support from Cal Fire, ventilated the Unit 1 main lube oil room to reduce the carbon dioxide discharge to habitable levels.

Units 1 and 2 are currently operating at 100 percent power.

Pacific Gas and Electric Company, a subsidiary of PG&E Corporation (NYSE:PCG), is one of the largest combined natural gas and electric utilities in the United States. Based in San Francisco, with 20,000 employees, the company delivers some of the nation's cleanest energy to 15 million people in northern and central California. For more information, visit www.pge.com/about/.