Earth Policy Institute: Renewable energy makes up only a small section of the energy market but since 2007 hydropower grew by 7 percent and wind power grew by 36 percent while coal declined slightly says a new report from the Earth Policy Institute. In fact in five US states more than 10 percent of electricity generation came from wind: South Dakota (22%), Iowa (19%),North Dakota (15%), Minnesota (13%) and Wyoming (10%) yet it is Texas that produces the most wind power at 10,400 MW.