Hydroelectric energy has several advantages and disadvantages. Some advantages of hydroelectric power plants compared to regular of fossil fuel power plants are that fuel is not burned in hydro plants, so there is no air pollution; the water used is renewable and free, so it can be replenished with nothing really being used. Those are the good things, but now for the few bad. Hydro plants have to have an existing waterfall or an area of land that can be flooded. They also require a large investment of money and time to build. (USGA)
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