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These flooded coal mines are being used to heat hundreds of homes
(www.euronews.com)
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So a water source heat pump tapping into mine shafts, neat. Run the heat pump off wind or solar, have a decent thermal envelope to lower overall demand, voila emission free heating and cooling. Sounds promising to me.
Could pumped hydro be combined for energy storage from offshore wind?
I don't see why not, provided you have the geography to make it work.