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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.
1 Hydroelectric power plants use water in a different way, converting the energy in falling water into electricity by passing it through turbines. 2  Fuel Extraction and Production â Water is a critical resource for the drilling and mining of natural gas, coal, oil, and uranium.ater is involved at many points in the process of producing electricity: 1  Electricity Generation â More than 90 percent of U.S. power plants need cooling. 2  These types of power plants are called thermoelectric because they use a heat source to produce steam for generating electricity.