In Philipp K. Dick's "Man in the High Castle" there's a dam on the Gibraltar Strait, used to generate electricity through the different water levels of the Atlantic Ocean and the now-isolated Mediterranean Sea.
Apparently this engineering feat has been seriously considered, it wasn't built because A- the long-terme effects on the Meditteranean area (since the water level would be much lower) and B- the cataclysmic consequances of a dam breakage.

@LienRag There were firm proposals to harvest energy from tidal barrages in the UK before the Tories took power. They could have provided something like 10% of the UK's energy needs. However, this proposed scheme is to protect coast rather than for energy generation.

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