Wind is caused by the different rates at which different places on earth are warmed by the sun, the interaction between air of different temperatures, water, clouds, mountains, and the earth's rotation. The energy in wind indirectly comes from the energy in sunlight. Wind has been used to propel ships for thousands of years and to power windmills for hundreds of years.
The following web sites provide general information about wind energy:
U.S. Department of Energy.
US National Renewable Energy Laboratory.
American Wind Energy Association (wind generation in Pennsylvania).
Small wind systems are systems that have peak outputs of less than 100kW. Individual owners may have windmills with peak outputs of only a few kW. For general information on small wind systems, visit these web sites:
For information on technical issues related to designing and installing wind systems, visit the following websites.
Wind system manufacturers.
National Wind Technology Center technical documents.
The following is more information on economic issues related to designing and installing wind systems.
Costs and Savings.
The following is information on environmental issues related to designing and installing wind systems.
General Environmental Information.
Impact on Wildlife.