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    $\begingroup$ Geothermal vents don't really work all that well on their own; it's one of those things that only became practical due to lots of high technology, and they actually decay over time (a typical lifetime for a geothermal plant is around 30-50 years, then it needs a century or two to replenish the heat to be practical power sources again). Even people in reach of really good geothermal vents (and who made use of them for e.g. bathing) didn't use them even for heating their homes - they used wood like everyone else (who could afford it). For a low-tech society, water power is far more practical. $\endgroup$ Commented Dec 31, 2018 at 14:08