I don't know what the current state of thermophotovoltaics are but maybe that's one way to go about it. Or maybe the temps are too low for that. Not sure. ht

I don't know what the current state of thermophotovoltaics are but maybe that's one way to go about it. Or maybe the temps are too low for that. Not sure. https://www.science.org/content/article/thermal-batteries-could-efficiently-store-wind-and-solar-power-renewable-grid https://www.science.org/content/article/thermal-batteries-co... UPDATE: Papers about geothermal source temperatures refer to tempratures up to 180°C. The thermal battery article above refer to TPV setups that use 1400°C source and efforts are being made to push temps to 2400°C for higher efficiency. https://www.sciencedirect.com/topics/engineering/geothermal-source-temperature https://www.sciencedirect.com/topics/engineering/geothermal-...