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It is produced from moving water. The volume of water flow and the change in election determines the amount of available energy in moving water. Water flows through a pipe and pushes against and turns the blades in the turbine to spine the generator to produce electricity. Hydropower relies on the water cycle. Solar energy heats the water on the surface of rivers, lakes, and oceans and that causes the water to evaporate. Water vapor condenses into cloud and falls as precipitations. Precipitation collects in streams and rivers, which empty into oceans and lakes

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- Hydropower produces 16% of world's electricity 80% of worlds renewable electricity
-  Most flexible source of power generation available
-Residents that get their electricity from hydropower have lower energy bills
- They hydro prices down depends on unpredictable change is fuel costs
- Hydropower accounts for 6.5% of the total U.S utility-scale electricity generation
-44% of total utility-scale electricity generation from renewable energy

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Dam building for hydroelectric power began in the 1930s in the U.S. The federal government constructed dams as public projects to  employ people and end the economic depression. The dam construction peaked in 1960, 3123 dams were finished in a year. Hydropower was used with paddle wheels to help grind grain.

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Hydropower relies on the water cycle.

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Once a dam has been built and the equipment is installed the energy just comes from flowing water is free. Harnessing the power of water is the cheapest form of energy. Depending on how much power the system outputs is what determines the cost of building. It ranges from about $224,315 to $212,369,600.

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Hydro-power is fueled by water- its clean- doesn’t pollute air like power plants. Hyrdro-power is domestic source of energy- allows each state to produce their own energy without being reliant on international fuel sources. Impoundment hydropower creates reservoirs that offer a lot of recreational opportunities.Some hydropower facilities can go from zero power to maxim output- quickly generate electricity. Flood control, irrigation and water supply.

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Hydroelectric power is a key part for development and wealth for nations with large amounts of river water and the economic resources to build dams. Hydropower  is renewable, pollution-free alternative to other forms of producing electricity. It is largest and oldest renewable energy source for electricity generation in U.S.