Reuters: The crippled San Onofre nuclear plant will be retired, its operator said on Friday, leaving California scrambling to keep the state's lights and air-conditioners on this summer even as it pursues ambitious plans to reduce greenhouse gas emissions. Southern California Edison, owned by Edison International , said it would retire both nuclear reactors at the plant in the face of onerous maintenance bills and an industry-wide shift toward burning more cheap natural gas to feed the grid. The...