It is sustainable enough under any reasonable scenario, and will in effect mainly just harness some of the heat that already dissipates. As for for rewarming t

It is sustainable enough under any reasonable scenario, and will in effect mainly just harness some of the heat that already dissipates. As for for rewarming the rock: if the strata that were porous and water filled were found at the appropriate levels this problem would be reduced. One would not need to hydro-shear the rock is normal in EGS plants nowadays (with some inconvenient side-effects - see Basel)[0] [0] https://en.wikipedia.org/wiki/Enhanced_geothermal_system https://en.wikipedia.org/wiki/Enhanced_geothermal_system