this post was submitted on 28 Aug 2023
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Folks in Finland recently tried exactly that, drilling 2 holes 6.4 km deep in Otaniemi, Vantaa. Unfortunately their fracking attempts failed and sufficient flow could not be established between the two wells. Also, temperature at the bottom was 120 C, not enough to get supercritical water (374 C is required). They donated the boreholes to scientific use, someone will try again and try better..
Once the "how" can be sorted out, it should be usable anywhere on Earth, not just volcanic regions. :) But it's not easy.
It's getting big press because one team in the US got their two wells to connect via fracking with sufficient flow and temperature to be useful.