Reutilization of mine water as a heat storage medium in abandoned mines

e development of innovative storage technologies as well as the use of sustainable low grade heat and cold sources are essential to expand the use of renewable energy sources. e utilization of mine water as a geothermal resource and/or as a thermal energy storage has the potential to play a key role to reach the ambitious climate goals set by the COP21. Flooded mines represent major low temperature geothermal reservoirs, which also provide large-scale seasonal thermal storage capacities. ese characteristics enable the development and dissemination of renewable energy systems and the improvement in energy e ciency of conventional systems.