This would be really useful although drilling deep may make it uneconomical. What it is though is a natural retrofit for an abandoned oil or gas well and become part of the plugging process that allows the well to be maintained at surface. The installed device could easily be a couple of hundred feet long to produce a lot of power.
No one would be too keen to drill a well exclusively for power production, but we have millions of wells with serious sunk costs in terms of drilling and well head hardware that ultimately must be removed and abandoned and this is expensive. Most do have enough heat at depth and the real need to re-complete and to set a plug.
This would obviously be a great fix and the industry would jump on it as it can sharply cut abandonment costs. It may be too much to ask that it be also profitable, but this will work.
New geothermal battery directly converts heat to electricity
14 hours ago
One question that the team wasn't sure about initially was how long the STC device could keep this cycle up, or even if it could keep going indefinitely. But during testing, they found their answer – eventually, the cycle dries up when the redox reactions do, because the different types of copper ions ended up in different places.