News: Innovative water battery


Pumped hydroelectric storage to help maintain grid stability is not a new approach for the energy industry—indeed, it was first used in the USA in 1930. However, German wind turbine manufacturer Max Bögl Wind AG has introduced an innovative twist, which they showcased at the Energy Storage North America (ESNA) fair in San Diego in August. The ‘water battery’ combines renewable power generation with a modern pumped-storage power plant to be used in periods of high demand. The pumped-storage power plant is available in three performance classes (16, 24 or 32 MW) and can switch between production and storage within 30 seconds.

The first project to use the technology is being developed in Stuttgart, Germany. It comprises a windfarm of four turbines, each of which have tower bases with in-built water storage capacity of 70 MWh. These are connected to a hydroelectric power station with 16 MW installed capacity and a lower reservoir in the valley 200 m below.

Feature image: This windfarm in Stuttgart, Germany, is using wind turbines combined with pumped hydro for energy storage, with water stored at the base of the turbines! Image: courtesy Solar Consulting

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