The idea is ingenious: Why not store energy in huge, hollow concrete spheres at the bottom of the sea or lake? A pilot project in Lake Constance a few years ago proved that this works. As part of the restructuring of the Rhenish lignite mining area, 500 storage units on the 400 metre deep bed of the planned open-cast mining lake could soon be supplying electricity when it is needed. A feasibility study is to show this.
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