Response to Request for Information (RFI) on Enabling and Transformative Technologies for Superhot Geothermal Power, DE-FOA-0003448

The document outlines critical technological needs for superhot geothermal systems (SHR), specifically those operating at or above 375°C. It identifies well construction and design as the most frequent point of failure and highlights permeability creation as the least mature technology vertical. The response recommends R&D in deep drilling (rotary, hybrid, and direct-energy), high-temperature materials like nickel alloys and ceramics, and the development of end-to-end surface power plant systems to bridge the gap between individual component readiness and commercial viability. It also suggests leveraging the existing U.S. oil and gas workforce and exploring ancillary revenue streams such as direct heat delivery for industrial processes.

• Well construction and design is identified as the most common point of failure in past superhot geothermal projects due to the combined effects of high temperatures, pressures, temperature variation, and corrosive fluids.
• Permeability creation for fractured systems is the least mature technology vertical required for superhot rock (SHR) energy. Key challenges include maintaining fractures in semi-ductile rock, modeling rock behavior in superhot environments, and managing induced seismicity.
• While individual components for SHR power plants are largely ready for commercialization (TRL 9), no end-to-end plant exists. The document recommends developing thermodynamic and turbomachinery software to streamline heat conversion system design and building an experimental end-to-end surface plant.
• Traditional casing materials (K55, L80) and Portland cement blends fail in SHR environments due to thermal fatigue and creep, with the latter having limited durability above 390°C. Research is recommended into nickel alloys, ceramics, and new cement additives.
• Superhot geothermal systems can provide ancillary revenue through the delivery of high-temperature heat streams for industrial applications, such as hydrogen creation, electrolysis, and direct heating/cooling, citing the Hellsheidi Geothermal Park in Iceland as an example.
• The transition to next-generation geothermal can leverage a pre-existing U.S. workforce of over 300,000 people from the oil, gas, and mining sectors who possess relevant expertise in drilling and subsurface engineering.

APA

Clean Air Task Force (2024). Response to Request for Information (RFI) on Enabling and Transformative Technologies for Superhot Geothermal Power, DE-FOA-0003448. https://cdn.catf.us/wp-content/uploads/2024/09/11114409/CATF-Response-to-Enabling-and-Transformative-Technologies-for-Superhot-Geothermal-Power.pdf

Chicago

Clean Air Task Force. Response to Request for Information (RFI) on Enabling and Transformative Technologies for Superhot Geothermal Power, DE-FOA-0003448. 2024. https://cdn.catf.us/wp-content/uploads/2024/09/11114409/CATF-Response-to-Enabling-and-Transformative-Technologies-for-Superhot-Geothermal-Power.pdf.

Wikipedia

{{cite press release |author=Clean Air Task Force |title=Response to Request for Information (RFI) on Enabling and Transformative Technologies for Superhot Geothermal Power, DE-FOA-0003448 |date=30 September 2024 |url=https://cdn.catf.us/wp-content/uploads/2024/09/11114409/CATF-Response-to-Enabling-and-Transformative-Technologies-for-Superhot-Geothermal-Power.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@misc{cleanairtaskforce2024response, author = {{Clean Air Task Force}}, title = {{Response to Request for Information (RFI) on Enabling and Transformative Technologies for Superhot Geothermal Power, DE-FOA-0003448}}, publisher = {Clean Air Task Force}, year = {2024}, month = sep, url = {https://cdn.catf.us/wp-content/uploads/2024/09/11114409/CATF-Response-to-Enabling-and-Transformative-Technologies-for-Superhot-Geothermal-Power.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }