[phreeza]

Are you suggesting to basically harvest the thermal energy in the rock in a non-renewable fashion? I don't think that is very promising, the heat capacity of rock is not that huge.

Back of the envelope calculation is drawing 1 GW from a cubic Kilometer of rock would lower the temperature by 1 degree C every 25 days. So I think you'd deplete a typical borehole quite quickly?

[griffzhowl]

> Are you suggesting to basically harvest the thermal energy in the rock in a non-renewable fashion?

As I understand it, that's how many geothermal plants work, effectively mining the heat underneath them, but at a rate of extraction that means they would become uneconomical over a span of decades rather than months.