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D_Alex comments on Stupid Questions May 2015 - Less Wrong
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Apart from what g_pepper has correctly pointed out regarding size/power of hydro plants...
With the right terrain, this is pretty trivial, all you need is a relatively small dam wall closing off a small ravine between mountains... here is a nice example:
http://www.iwb.ch/media/de/picdb/2012/366/nant_de_drance_stausee_vieux.jpg
http://www.iwb.ch/media/de/picdb/2012/367/nant_de_drance_stauseen_vieu.jpg