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The northern German city of Hamburg hopes for a 鈥淪ilicon Valley for renewable energies鈥� as Siemens is testing a new energy storage system, writes Olaf Preu脽 for Welt Online. The system would heat up rock fill with excess wind power, which a turbine later converts back into electricity. 鈥淩ock as storage medium promises far greater performance potential than battery storage,鈥� Till Barmeier, project leader at Siemens, told Die Welt. Siemens last September that it would start constructing a full-size facility for Trimet鈥檚 aluminium smelter in Hamburg in spring 2017. It will be able to store around 36 megawatt hours in a container with around 2,000 cubic meters of rock, according to Siemens.

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For background read the 麻豆无码版 dossier New technologies for the Energiewende.