Wind is a form of solar energy and is caused by the heating of the atmosphere by the sun. The wind flows across the surface of the earth and the patterns vary with passage of wind through the earth's terrain. Mountain chains, oceans, lakes and vegetative masses affect the flow patterns of wind and this wind flow, when captured by modern wind turbines, can be used to generate electricity.
A wind energy system produces electrical current by means of gathering up the power from wind with the help of machines known as wind turbines. Wind energy may be generated for home use in stand-alone applications or by the use of multiple turbines called wind farms and distributed to the electric grid.
A typical wind turbine needs to have a sustained wind speed of a minimum of 10 miles/hour in order to turn the wind turbines fast enough to produce electrical current. Wind turbines typically generate around 50-300 kilowatts of electrical current depending on the location and size of the wind power unit.
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