Wind turbines capture the wind’s energy. Propeller-like blades or similar purpose structures mounted on a rotor turn the turbine creating Direct Current (DC) which is converted into Alternating Current (AC) for use. The large turbines are usually mounted on towers about one hundred feet in the air where the wind is more consistent. The turbines can be stand alone or be grouped into farms for direct connection to the electric grid. As part of green building practice, the small turbines are now being integrated and sometimes paired with solar systems to serve regular commercial buildings, agriculture, residential and mobile use.
Forty-six of the fifty states contain wind resources suitable for commercial development, although only fifteen percent of the country has excellent wind. Total installed U.S. wind capacity at year’s end 2006 was 11,603 MW, or enough to serve more than 2.9 million average households. New, larger wind turbines (from 1 to 3 megawatts per turbine) generate 120 times as much electricity as 1980's models, at one-sixth the cost, and with much more reliability due to substantially improved gear boxes.
On April 24, 2008, the California Public Utilities Commission acted to assist larger wind projects by increasing from 1 MW to 3 MW the size of the wind projects that can qualify for cash incentives under the Self-Generation Incentive Program for 2008 and 2009.
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