The battery is located nearly 2,000 feet (600 m) underground in the Swiss Alps. Interesting Engineering reports: A water battery consists of two large pools of water located at different heights. When power production is high, excessive power is used to move water from the lower pool to the pool at a higher height, which is similar to charging a conventional battery. When power demand increases, the water at the higher level can be released and, as it heads to the lower pool, it passes through turbines that generate electricity and can be used to power the grid.
The water battery that recently went operational in Switzerland has a storage capacity of 20 million kWh, the equivalent of 400,000 electric cars, and is aimed at helping stabilize the energy grid in Switzerland and other connected grids in Europe. The plant has six turbines that can generate 900 MW of power and cost 2 BILLION DOLLARS
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