German coal mine to be repurposed as a giant battery to store renewable energy

A coal-mine that powered German industry for almost half a century will get a new lease on life when it’s turned into a giant battery that stores excess solar and wind energy.

Entrance to mine.

The state of North-Rhine Westphalia is set to turn its Prosper-Haniel hard coal mine into a 200 megawatt pumped-storage hydroelectric reservoir, which acts like a battery and will have enough capacity to power more than 400,000 homes, said state governor Hannelore Kraft.

The town of Bottrop, where people worked the 600 meter (1,969 foot) deep mine since 1974, will thus revitalize its economy while maintaining its historic role in providing uninterrupted power for the country.

Germany’s decision to turn a coal mine into a pumped-hydro-storage station may solve two of the most intractable challenges created by its shift to clean power.

Design of renewable energy battery.

On a local level, it provides new economic activity in a region where generations of workers have relied on fossil fuel for their livelihoods. On a regional level, it catalyzes the expansion of renewable energy by helping to maintain electric capacity even when the wind doesn’t blow or the sun doesn’t shine.

The consortium running the Prosper-Haniel project, which includes the University of Duisburg-Essen and mine owner RAG AG, are confident that the mine is suitable to become a storage pump.

RAG AG, formerly Ruhrkohle AG, is the largest German coal mining corporation. The company headquarters are in Herne in the Ruhr area. The company was founded on November 27, 1968, consolidating several coal mining corporations into the Ruhrkohle AG.

Images courtesy of RAG AG.

See full article by Diarmaid Williams in Power Engineering International.

See full article by Brian Parkin in Bloomberg.

See RAG AG website.

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