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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.
There are three types of natural gas plants currently used to generate electricity: steam generation, simple cycle and combined cycle. Steam generation plants use natural gas to heat water and create steam that spins a turbine, just as in a coal plant.