Hydroelectric power, is the electricity, generated by the force of falling water. Its one of the cleanest sources of energy, and its 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 turbine is connected to the generator that makes electricity as it spins. After passing through the turbine, the water flows back into the river on the other side of the dam.
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Last date updated on June, 2014