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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 plants are one of the most successful sources of renewable energy. Water is about 800 times denser than air, so even a slow flowing stream can produce a considerable amount of energy. Hydroelectric plants are extremely long-lived, with many having been in operation for more than 100 years.