Converting a Coal Mine into Giant Battery to Store Renewable Energy for off-Hours
Germany Converts Coal Mine into Giant Battery to Store Renewable Energy for off-Hours EnviroNews World News on April 2, 2017 North Rhein Westphalia, Germany — The Prosper-Haniel hard coal mine, slated to be shut down in 2018 when government subsidies run out, is being repurposed to become a giant battery for excess power created by renewable energy sources. Located in North Rhein Westphalia, the coal mine’s conversion will allow Germany to store 200 MW of electricity for use during times when solar and wind are unavailable or unable to meet energy needs.
The storage is formed by a reservoir of water above the mine. The water can be released into the system when it is needed. As gravity pulls the water into the coal mine below, the water turns a turbine creating electricity. The water is then pumped back to the reservoir. This can be done when power prices are lower or when renewable energy sources are making more energy than people are using, as they did in Germany on May 12, 2016. This isn’t the first pumped hydroelectric storage station; however, it is the first one to use a coal mine for its lower reservoir.
According to Governor Hannelore Kraft, the miners of Bottrop will remain employed during the conversion process. Thus the plan addresses two concerns about which most opponents are vocal when it comes to energy sources like solar and wind. It creates a storage system, and it keeps people employed…….http://www.environews.tv/world-news/germany-converts-coal-mine-giant-battery-store-renewable-energy-off-hours/
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