What are the good and bad things about hydroelectric power?

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Good things about it: It is a renewable energy source, it is reliable, it is virtually free after you build a dam (except for the upkeep of the dam), it generates huge amounts of power, it can be used for flood control, and it creates jobs for people.

Bad things about it: (These things apply to dams with reservoirs, not run-of-the-river dams) The reservoirs displace people and the dams hold back nutrient-rich sediment that would fertilize areas further downstream.
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