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Conventional boreholes are cased with steel and cement. Vitrified walls would theoretically save that material cost (if it actually worked)

Great start, but one important factor is missing from this analysis: The surface area (for heat exchange) of a closed-loop borehole is tiny compared to the surface area in a natura…

Another thing that should be considered: how do you keep the hole open while drilling? At extreme P and T, the hole will close in on the drillstring. Also, fluids turn very nasty i…

ENergy conversion equipment can't easily be re-purposed for geothermal. The temperatures are usually much lower, and the working fluids are often hydrocarbons instead of steam.