It may be possible to use existing but no longer used oil and gas wells to tap underground geothermal heat as energy sources.
Source: The US may have an unexpected green energy source: abandoned oil and gas wells – Vox
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It may be possible to use existing but no longer used oil and gas wells to tap underground geothermal heat as energy sources.
Source: The US may have an unexpected green energy source: abandoned oil and gas wells – Vox