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UNTIL NOW.......... https://www.bbc.co.uk/news/business-60066690 The refinement of replacing a reservoir under the seabed with a flexible bladder, is really innovative.

I saw a proposed Dutch scheme maybe 5 years ago, that envisaged sinking a huge tank onto the seabed, with wind turbines attached above. When the turbines were generating, excess capacity would be used to pump water out of the tank. When additional capacity was required, the water inlets would be...