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by Nadya 3501 days ago
For what it is worth the cost of solar is dropping - and pretty steadily at that, if I recall correctly.

Japan has researched and is working on developing tidal energy [0]. But that's the only case I know of off-hand even related to tidal energy at all... and it hasn't been built yet.

[0] http://www.hydroworld.com/articles/2014/12/japan-develops-ti...