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 Hydroelectric power, or hydroelectricity, is generated by the force of falling water. It's one of the cleanest sources of energy, and it's also the most reliable and costs the least. Water is needed to run a hydroelectric power-generating unit. The water is held behind a dam, forming an artificial lake, or reservoir. The force of the water being released from the reservoir through the dam spins the blades of a giant turbine. The source of the water comes from either a river or a pump storage unit. |
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