The highest concentration of wind turbines in the U.S. is in the Great Plains states, where the best conditions for onshore wind power generation exist, according to the U.S. Energy Information Administration's (EIA) Today in Energy news bulletin.
However, wind capacity also exists in other areas of the U.S., especially in places where local requirements such as renewable portfolio standards (RPS) support wind capacity expansion.
Extremely low wind-generating capacity in the southeastern U.S. reflects both low average wind speeds and the lack of wind-focused, state-level RPS programs, according to the EIA. Furthermore, this region has a large existing inventory of relatively new natural-gas combined-cycle plants that are not fully utilized.
In 2010, the U.S. had 38 GW of installed wind capacity, which generated 2.3% of the nation's electricity, according to preliminary EIA data.