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Originally Posted by Pierre
As mentioned not enough fast rivers or Dams with with a large enough bank of water.
There are several "fast response" hydro power station like the one in Dinorwic in Snowdonia. These instantly respond to large sudden demand such as everybody putting the kettle on during the ad-break in a Coronation St special, but they can only maintain the power for a few hours at most.
Hydro stations such as the Hoover dam in the USA have massive lakes behind them (Lake Eerie) so they can maintain constant flows even in times of low rainfall.
The best eco-friendly power available to us is wind power. We should be building hundreds of massive offshore wind farms.
But you always get the NIMBY crowd objecting.
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You also get the problem that more power / materials and stuff that goes into wind turbines is needid than the power output over its entire lifetime