German institute successfully tests underwater energy storage sphere
I read about that about four days ago in a Swiss online newspaper [1] (German). The Lake Constance is a large lake (length 64km &#x2F; 39mi) carved by the Ice Age Rhine glacier shared by Germany, Switzerland and Austria.<p>Since November last year a hollow concrete sphere with the weight of 20 metric tons has been sitting on the lake bed at a depth of 100m &#x2F; 300ft. In times of excess power water is pumped out of the sphere and power is regenerated by inflowing water powering a turbine.<p>Now they are going to experiment with an even bigger sphere in the sea. Perhaps there will be some differences because of the salt water environment.<p>[1]: <a href="http:&#x2F;&#x2F;www.tagblatt.ch&#x2F;ostschweiz&#x2F;Forscher-speichern-Strom-im-Bodensee-mit-Betonkugel;art120094,4918903" rel="nofollow">http:&#x2F;&#x2F;www.tagblatt.ch&#x2F;ostschweiz&#x2F;Forscher-speichern-Strom-i...</a>