Rodatherm Energy wants to make geothermal more efficient, but will it be cheaper?
Rodatherm Energy emerged from stealth with $38 million in Series A funding. It plans to build a closed-loop geothermal power plant that uses refrigerants to move heat to the surface.
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https://techcrunch.com/2025/09/15/rodatherm-energy-wants-to-make-geothermal-more-efficient-but-will-it-be-cheaper/