Why are dams built near river?

Answer 1

it is bcoz in a hydroelectric power station, fast flowing water spins the turbines. On a wind farm, the wind turbines spin due to fast wind and in the sea, in the sea, waves and the tide can be used to make a turbine spin.

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Answer 2

Because often power stations get electicity from waves :)

Answer 3

for safety reasons and because the steam produced exists the system and goes back into the water to be reused :p