Organized competitive markets have added about 4,900 megawatts (MW) in installed wind energy generation resources over the past year, the Federal Energy Regulatory Commission (FERC) staff concluded in the Summer 2010 Energy Market and Reliability Assessment. Data from the North American Electric Reliability Corporation's summer assessment finds overall wind capacity is up about 6,940 MW, or 25 percent, since summer 2009 – bringing total national wind capacity to 34 GW.