Renewable energy plays an important role in Arkansas's energy production and consumption cycle. The state's energy mix included 10% renewables, compared to a national average of 5.7%, in 2007.[29] Hydroelectric power is the state's largest source of renewable energy. Dams such as Beaver, Bull Shoals, Greers Ferry, and Dardanelle Lock and Dam all have capability of producing hydroelectric power.[30] Although Arkansas ranks 27th nationally in wind energy potential, the state has few wind turbines installed.[31] However, the world's largest turbine blade manufacturer, LM Wind Power and Nordex, a turbine component company have both added facilities in the state.[32]