Energy efficiency: Using old mines as underground pumped storage plants as a promising approach?

One of the topics the participants discussed about during EnercitEE’s Component Seminar in Växjö, was what kind of innovative energy storages for energy from RES are currently being developped. The university of Duisburg-Essen in Germany’s densly populated Rhine-Ruhr area is investigating the potential to use abandoned mines in the Ruhr area as potential storages for water of underground pumped storage plants.

You can read about this interesting idea under the following link.