Wave and Tidal Power/Hydroelectric

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 Tidal power, wave power and hydroelectric are three forms of energy generation based on water. Hydroelectric consists of water from dammed lakes and rivers going through turbines in the dam. Hydroelectric is environmentally friendly, but most feasible sites around the world have already been dammed.

Tidal power comes from sea water moving through turbines as it flows in and out along tidal currents. The ocean tide is free, environmentally friendly, and predictable, which makes tidal power appealing. Wave power is a similar technology, in which the motion of waves is converted into electricity. Work is also being done on capturing energy from the heat and salt content of water.

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