While the United Nations Climate Conference (COP15) was taking place in Copenhagen, Denmark, Brazil's National Electric Energy Agency (ANEEL) held the country's first ever wind-only energy auction. On December 14, around 1,800 megawatts (MW) were contracted with energy from 71 wind power plants scheduled to be delivered beginning July 1, 2012. The wind power auction has reinforced Brazil's success in generating electric energy from renewable sources, which currently represent 85.4% of the country's electricity supply, according to preliminary data from the 2009 National Energy Balance, conducted by the Energy Research Corporation (EPE).