According to the CleanEdge 2013 U.S. Clean Tech Leadership Index, renewable energy from wind, solar, geothermal, biomass, and other sources, accounted for forty-nine percent of U.S. added electricity capacity during 2012. This was the largest percentage ever.
Wind capacity was forty-one percent of the growth.
Natural gas–not considered a renewable–accounted for thirty-three percent of added electric capacity.