Southampton has had geothermal heat since the 80s

https://www.southampton.gov.uk/our-green-city/council-commitments/sustainable-energy/heat-networks/

A sinkhole revealled abandoned mines somewhere in Surrey. This sort of project could make the clear up costs worth it but it’s probably too late and can’t blame them for not realising it’s an option

Gateshead council use heat from water in flooded mines to heat hundreds of homes. It is estimated that a quarter of homes sit above abandoned coal mines which could be used in the same way.

This makes me think, can geothermal energy be a viable way to revitalize Donbas after the war?