I missed this article eleven months ago: geothermal, as alternative to hydroelectric or coal or nuclear. (Or SpaceX Solar.) On topic of test-loops.
As the article notes this has been a thing over the Yellowstone hotspot (e.g. Boise) for over a century. Not all of us on Earth are so fortunate however.
Strikes me as something the Afar would want, to power desalination of the Red Sea's water.
And, of course, Venus. Its supercritical fluid would be carbon dioxide; if they're just working with the temperatures and pressures of the Maxwell range, maybe sulfur or lead.
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