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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.
Hydroelectric power is currently the largest producer of renewable power in the U.S. It produced around 6.2% of the nation's total electricity in 2010 which was 60.2% of the total renewable power in the U.S. The United States is the fourth largest producer of hydroelectricity in the world after China, Canada and Brazil.