Wind power is the conversion of wind energy into wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships.
Wind power is used as an alternative to fossil fuels, no greenhouse gas emissions during operation. Any effects on the environment are generally less problematic than those from other power sources.
A large wind farm may consist of several hundred individual wind turbines which are connected to the electric power transmission network.
Offshore wind farms can harness more frequent and powerful winds than are available to land-based installations and have less visual impact on the landscape but construction costs are considerably higher. Small onshore wind facilities are used to provide electricity to isolated locations and utility companies increasingly buy surplus electricity produced by small domestic wind turbines.