Volts What's the deal with closed-loop geothermal?
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Jan 9, 2026 
Jeanine Vany and Mark Fitzgerald, leaders at Eavor, delve into closed-loop geothermal technology, a game-changer in renewable energy. They explain how this system, operating like massive underground radiators, can tap into geothermal resources almost anywhere, avoiding fracking and significant water use. With their new plant in Germany, they discuss the advantages of scalability, reduced seismic risks, and the potential for heat and power markets. The duo also highlights the collaboration needed to bring this innovative technology to market and its impact on energy costs.
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Sealed Pipes Enable Geography Agnostic Geothermal
- Closed-loop geothermal confines working fluid to sealed pipes and uses conductive heat transfer instead of relying on porous hot reservoirs.
- That enables siting flexibility and access to average geothermal gradients almost anywhere without fracking.
High CapEx, Low OpEx, Predictable Output
- Eavor trades convective reservoir flow for conductive heat capture via long lateral loops to reach comparable energy delivery.
- The model has high upfront drilling costs but low operating expenses and predictable multi-decade output if operated within design rates.
Manage Leak-Off With Sealant Interventions
- Monitor leak-off and use downhole sealant interventions if required to maintain a near-zero fluid inventory.
- Truck in and pump additional silicate sealant when small leaks appear to restore integrity.