Commercial scale wind turbines (the big ones) cost from 1.2 to 2.6 million dollars to install.
A typical wind system can be installed for twenty thousand dollars and pay for itself within ten years. In addition, a wind turbine requires minimal maintenance, such as keeping the moving parts lubricated. Currently the average cost of producing one kilowatt-hour of electricity using wind power is about six cents, although some wind farms can produce at a lower cost.
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