Reuters: Pacific Gas & Electric Co on Thursday announced two solar power contracts that will generate enough electricity to serve about 239,000 homes and help the utility meet California’s aggressive renewable energy requirements. The unit of PG&E Corp said it struck two deals with photovoltaic solar companies OptiSolar Inc and SunPower Corp for a total of 800 megawatts (MW) of solar energy. Both deals, however, are contingent upon the extension of key federal tax credits that …