A vast Chinese province of nearly 6 million people has generated all the power it needed for an entire week without using any fossil fuels, according to state-run Chinese media. Qinghai, a Tibetan plateau province in the country’s northwest, derived all of its power from wind, solar, and hydro-electricity from June 17 to June 23. The experiment was part of a trial run by the government to see if the electricity grid could cope without the kind of constant, reliable energy normally provided by fossil fuels.