North Dakota has the greatest wind energy potential of any state in the country.
According to the U.S. Department of Energy, all U.S. electrical energy needs could be met by the wind in Texas and the Dakotas alone.
A 1991 study conducted by Pacific Northwest Laboratory, An Assessment of the Available Windy Land Area in the United States, determined wind turbines in North Dakota could produce 1.2 billion kilowatt-hours (kWh) of electricity annually—an amount that could supply more than 14,000 times the electricity consumption in the entire state, or 36% of the 1990 U.S. electricity consumption.

A document recently released by Wind Energy America states that;
Worldwide, wind is the fastest growing renewable energy resource. Globally, installed capacity exceeds 120,800 megawatts (end of 2008). The U.S. has now officially overtaken Germany (23,902 MW) as number one in wind power. The U.S. wind industry broke all previous records by installing 9,922 MW (9.9 GW) in 2009. The U.S. is now officially the leader in wind energy with more than 35,000 megawatts of installed capacity, as of the end of 2009, a 39% increase in the nations fleet over last year.

THE TOP TWENTY STATES for wind energy potential, as measured by annual energy potential in the billions of kWhs, factoring in environmental and land use exclusions for wind class of 3 and higher.

1	North Dakota 1,210		11	Colorado 481
2	Texas 1,190		12	New Mexico 435
3	Kansas 1,070		13	Idaho 73
4	South Dakota 1,030		14	Michigan 65
5	Montana 1,020		15	New York 62
6	Nebraska 868		16	Illinois 61
7	Wyoming 747		17	California 59
8	Oklahoma 725		18	Wisconsin 58
9	Minnesota 657		19	Maine 56
10	Iowa 551		20	Missouri 52

*Source: An Assessment of the Available Windy Land Area and Wind Energy Potential in the Contiguous United States, Pacific Northwest Laboratory, 1991.