(FILES): This March 15, 2011 file photo shows the San Onofre Nuclear Power Plant in north San Diego County, California. The US nuclear energy watchdog ordered a California’s atomic plant on March 27, 2012 to remain shut down until the cause of a mystery glitch is found, raising questions about high-season power supplies. The San Onofre nuclear plant north of San Diego — one of only two in the populous western state — has been offline since January, when one of its units suffered a leak in a steam generator tube. AFP PHOTO / Files / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
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