DeGolyer and MacNaughton issued the first reserves report on Enhanced Geothermal Systems for Fervo Energy

June 11, 2025

Fervo Energy Drills 15,000-FT, 500°F Geothermal Well, Pushing the Envelope for EGS Deployment

In coordination with the drilling of its Sugarloaf appraisal well, Fervo Energy has obtained an independent geothermal reserves report from worldwide consulting firm DeGolyer & MacNaughton for Phase I of its Cape Station project. This comprehensive technical and economic evaluation of Fervo’s development plan provides external verification regarding Fervo’s ability to deliver contracted clean energy volumes to customers, including Shell Energy and Southern California Edison.

DeGolyer & MacNaughton performed an independent estimation of reserves in accordance with the Petroleum Resources Management System, and applied those same principles to the evaluation of thermal energy. The firm also conducted a comprehensive review of Fervo’s drilling data, geologic models, and production test results. DeGolyer & MacNaughton found that Fervo’s proprietary enhanced geothermal system successfully unlocks thermal recovery factors ranging from 50 to 60 percent, tripling the amount of useful thermal energy reserves compared to conventional geothermal technology. The results of the report confirm that the Cape Station project area can support over 5 GW of development at depths of up to 13,000 feet. The success of the Sugarloaf well in combination with the application of Fervo’s enhanced geothermal systems are expected to significantly increase the resource potential of the Cape Station project.