20 DECEMBER 2025 WorldWide Drilling Resource® www.starironworks.com 257 Caroline Street Punxsutawney, PA 15767 800-927-0560 • 814-427-2555 Fax: 814-427-5164 Serving the Construction Industry See us at Booth 2212 Groundwater Week 2025 in New Orleans A Major Milestone for Enhanced Geothermal Systems Adapted from Information by Fervo Energy Fervo Energy announced a significant milestone with the successful drilling and logging of its Sugarloaf appraisal well, showcasing the rapid progress and scalability of enhanced geothermal systems (EGS). The well reached a true vertical depth of 15,765 feet and is anticipated to achieve a bottom-hole temperature of 520ºF (271ºC) following complete thermal equilibration. Remarkably, Fervo completed the drilling of the Sugarloaf well in just 16 days, making a 79% reduction in drilling time compared to the U.S. Department of Energy’s benchmark for ultradeep geothermal wells. During the drilling of what is now Fervo’s hottest and deepest well to date, the company set multiple performance records, including a maximum bit run length of 3290 feet, an average rate of penetration (ROP) exceeding 300 feet/hour at depths beyond 15,000 feet. These achievements broaden the potential for commercial EGS viability into significantly deeper and hotter environments, paving the way for deploying this technology beyond the western United States. An independent assessment by DeGolyer & MacNaughton, which involved a thorough review of Fervo’s drilling data, geological models, and production test outcomes, estimated the heat-in-place and reserves. The report indicates Fervo’s innovative EGS design can unlock thermal recovery factors between 50% and 60%, effectively tripling the amount of usable thermal energy reserves. It also confirms the Cape Station project area is capable of supporting over five gigawatts of development at depths of up to 13,000 feet, with the new Sugarloaf drilling results likely to enhance Cape’s resource potential even further. “Back in July 2020, we performed our first EGS field trials at reservoir temperatures of around 300°F [149ºC],” said Jack Norbeck, CTO and Cofounder of Fervo Energy. “In just a few years, we’ve developed innovations that enable our technology to operate reliably at temperatures exceeding 500°F [260ºC]. These drilling results demonstrate that Fervo is operating in the optimal geothermal conditions for large-scale commercial deployment.” As the demand for power in the U.S. surges, Fervo’s ability to harness firm, carbon-free energy from deep underground heat reservoirs positions the company as a vital player in the nation’s energy landscape. GEO
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