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I'd say whatever WILL work is whatever HAS been working thus, only traditional use in places like Iceland and New Zaylund.
Hmmm - so if this was 1930 you'd say categorically that nuclear power will NEVER occur ?
As far as I know their are no major technical limitations to geothermal oil drilling technology can readily be adapted at least for pilot projects. Your talking about technical hurdles. If it was generally worthwhile then I'd think we would have a lot more then we do now. Think about some factory and its energy usage if they could recoup costs going geothermal then I think they would have.
I don't know enough to say if their is some breakout technology close. I'd think you would have to drill 20-30 miles down and get closer to the mantle to get a really good geothermal solution but drilling into or near the mantle is well beyond our capabilities.
I'm actually a big fan of the concept of geothermal.