Going under water // Electricity from wind and solar requires systems that store electricity that will be needed at a later stage. In November the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) in Kassel tested the prototype of a storage system in Lake Constance. A hollow sphere storage system positioned 100 meters deep is designed to demonstrate feasibility in a simulated service test. And we are involved as well: We supplied the pressure equalization line for the testing. What's so special about this hoses: Air can flow into the sphere through the hose when water is pumped out. That prevents insufficient pressure. bit.ly/2m1P8En
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