Xinhua: California’s largest utility company has signed deals to build the world’s two biggest solar plants that would supply electricity to 250,000 homes and reestablish the United States as the global leader in solar power, officials said Friday. Pacific Gas and Electric (PG&E), which is based in San Francisco and serves most of northern California, will use the two massive solar facilities to help it meet state requirements to generate 20 percent of its electricity from renewable …