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electricity

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Disrupts fish migration, not efficient during droughts, limited reservoirs that are suitable for a hydroelectric dam

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Cost efficient, no pollution, domestic source of energy

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Cost's involved with making this resource useable.

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Cost's involved with making this resource useable.

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Hydroelectric plants are very cost efficient once they are built (an average of 0.85 cents per kilowatt-hour). However the problem is that they are expensive to build and have to be built in an existing river.

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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.