Dallas Morning news: At the height of the 2011 drought, the worst one-year drought in Texas history, the president of the Electric Reliability Council of Texas wrote to the head of the Public Utility Commission warning of unusual stresses on the power grid, even for a Texas summer. Demand for electricity was at an all-time high because of the heat, and the water needed to cool the states coal, nuclear and gas power plants was in short supply. In some places, water levels had dropped below intake pipes; in others,...