An anonymous reader quotes a report from CNN: The renewable energy sector had slightly more installed capacity than coal in April, according to a Federal Energy Regulatory Commission report. That means U.S. power plants can produce more energy from clean sources than coal for the first time in history, according to the SUN DAY Campaign, a nonprofit research group supporting sustainable energy. The breakthrough reflects the plunging cost of solar and wind as well as heightened environmental concern about coal. Also in April, the renewable energy sector was projected to have generated more electricity than coal, according to a separate report published by the Institute for Energy Economics and Financial Analysis. That transition was partially driven by seasonal issues.