Where is it currently being used on a large scale

4

Wind turbines are used most in the us where wind speeds are the highest so in the middle of our country

http://www.smartplanet.com/blog/smart-takes/top-10-states-for-wind-power-in-the-united-states/4439

http://www.smartplanet.com/blog/smart-takes/top-10-states-for-wind-power-in-the-united-states/4439

They are also found on the edges of the us.

http://upload.wikimedia.org/wikipedia/commons/thumb/8/84/United_States_Wind_Resources_and_Transmission_Lines_map.jpg/220px-United_States_Wind_Resources_and_Transmission_Lin
es_map.jpg