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Hydroelectricity is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste.
Wind generators, or wind turbines, have become a popular symbol of clean carbon free electricity. Unlike other sources of renewable energy such as hydro-electricity or geothermal, wind and solar power are variable producers of electricity. Since the wind does not always blow nor the sun always shine, any given wind turbine will never produce its full capacity rating for an extended period of time.