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In response to "Liioulu, geothermal is totally scalable. "in California, where more than 40 geothermal plants provide nearly 5 percent of the state�s electricity" -- (link)" by zork

if you have the gradient to do small, large will be more efficient. a lot of the west and southwest states could do it, but most of the rest of the US

couldn't.
plus geothermal holes cost a fortune to drill, and have a fairly high miss rate. makes it tricky for individuals to do. not impossible, but it's definitely more efficient on a larger scale.


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