Regarding "repurposing". You have it backwards. Hydraulic fracturing for geothermal -- then known as Hot Dry Rock, but now called EGS -- has been around in prac

Regarding "repurposing". You have it backwards. Hydraulic fracturing for geothermal -- then known as Hot Dry Rock, but now called EGS -- has been around in practice since (at least) the 1970s [1]. It's basically the creation of permeable pathways for water to flow through in order to mine the heat. "Fracking" for natural gas took off in 2000's. The essence of the process is the same -- creation of permeable pathways. But many of the more controversial practices (high volume flow, slickwater, heavy use of biocides) are avoided by EGS projects specifically for environmental reasons. [1] https://en.wikipedia.org/wiki/Hot_dry_rock_geothermal_energy https://en.wikipedia.org/wiki/Hot_dry_rock_geothermal_energy