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How is water power generated today?

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In modern practice, water flowing from a higher level to a lower level (as from a dam or waterfall) is used to activate a turbine that drives an electric generator, a process called hydroelectric power generation. The amount of power furnished is proportional to the rate of flow of the water and the vertical distance through which it falls. In a pumped-storage plant, water is pumped upward to a high-level reservoir during periods of low electricity demand by using the excess electricity available. During periods of high demand the facility produces electricity by using the water that flows down from the reservoir.

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