California's Last Nuclear Plant

FILE - Bill Denneen, of Nipomo, center, with his "No Diablo" sign during the Chumash Indian blessing before the start of the 12/12/12 Walk for a Nuclear Free Future, a 12 mile walk for peace from the gates of Diablo Canyon Nuclear Power Plant to the courthouse in San Luis Obispo, Calif., Dec. 12, 2012. An aggressive push toward renewable energy has run headlong into anxiety over keeping the lights on in California, where the largest utility has said it's considering trying to reverse a decision to shutter the state's last operating nuclear power plant. (Joe Johnston/The Tribune of San Luis Obispo via AP, File)