Geothermal Energy Efficiency: Cost and Potential
- startup aims to demonstrate a novel approach to enhanced geothermal systems with a pilot plant in Utah, slated for completion by the end of 2026.
- Rodatherm Energy, a newly launched geothermal startup, officially emerged from stealth mode on Monday, September 16, 2025, announcing $38 million in series A funding.
- Most enhanced geothermal systems rely on fracturing hot,dry rock deep underground and circulating water through the fractures to extract heat.
Rodatherm Energy Secures $38 Million to Advance Refrigerant-Based Geothermal Technology
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startup aims to demonstrate a novel approach to enhanced geothermal systems with a pilot plant in Utah, slated for completion by the end of 2026.
Updated September 16, 2025, at 00:50:09 MDT
What is Rodatherm Energy?
Rodatherm Energy, a newly launched geothermal startup, officially emerged from stealth mode on Monday, September 16, 2025, announcing $38 million in series A funding. The company is developing a unique approach to enhanced geothermal systems (EGS) utilizing a closed-loop system filled with a refrigerant, rather than the water-based systems common in traditional EGS projects.
How Rodatherm’s Technology Differs
Most enhanced geothermal systems rely on fracturing hot,dry rock deep underground and circulating water through the fractures to extract heat. Rodatherm’s approach uses a closed-loop system,likely constructed from steel,filled with a refrigerant. This refrigerant absorbs heat from the earth and is then used to generate electricity. This method potentially offers several advantages:
- Wider Applicability: Refrigerant-based systems may be viable in locations where water resources are limited or where fracturing rock is challenging.
- Reduced Water Usage: Closed-loop systems considerably reduce or eliminate water consumption, addressing environmental concerns associated with water-intensive geothermal projects.
- Enhanced Efficiency: Refrigerants can have superior heat transfer properties compared to water, potentially leading to higher energy output.
funding Details and Investors
The $38 million Series A funding round was led by Evok Innovations, a venture capital firm focused on climate technologies. Other participants included active Impact Investments, Giga Investments, Grantham Foundation for the Protection of the Environment, MCJ, TDK Ventures,tech Energy Ventures, and Toyota Ventures. This diverse investor group signals strong confidence in Rodatherm’s potential.
Utah Pilot Plant and Power Purchase Agreement
Rodatherm plans to utilize the Series A funding to construct a 1.8-megawatt pilot plant in Utah,with completion targeted by the end of 2026. Utah Associated Municipal Power Systems (UAMPS) has committed to purchasing the electricity generated by the project. This power purchase agreement (PPA) provides Rodatherm with a guaranteed revenue stream and validates the commercial viability of its technology.
Competition in the Enhanced Geothermal Space
Rodatherm enters a rapidly growing field of enhanced geothermal companies.Competitors include companies focusing on traditional EGS techniques, as well as those exploring option approaches like advanced drilling technologies and different heat transfer fluids. The success of Rodatherm will depend on demonstrating the cost-effectiveness and scalability of its refrigerant-based system.