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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 stations in the United States are currently the largest renewable source of energy, but the second for capacity. Hydroelectric power produced 35% of the total renewable electricity in the U.S. in 2015, and 6.1% of the total U.S. electricity. According to IEA the United States was the 4th largest producer of hydroelectric power in the world in 2008 after China, Canada and Brazil. Produced hydroelectricity was 282 TWh. It was 8.6% of the world's total hydropower. The installed