Gaining steam (pun intended) in the geothermal world is a process called enhanced geothermal systems, in which a heat transfer fluid is heated directly by being injected down hold drilled deep in dry rock.
For individual household applications, geothermal heat pumps pass air through a pipe below ground that stays a constant 50 to 60 degrees, heating in the winter and cooling in the summer, saving boatloads on utility costs in the process.
And it's much easier to get excited about geothermal power once you see the growth numbers.
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