Utah FORGE Launches Extended Geothermal Test to Assess Long-term Viability
The Frontier Observatory for Research in Geothermal Energy (Utah FORGE) has initiated a four-month extended circulation test to evaluate the long-term reservoir performance of Enhanced Geothermal Systems (EGS) near Milford, Utah. The test, which started on August 12, 2026, is funded by the U.S. Department of Energy and managed by the University of Utah.
This test involves injecting non-potable cool water into well 16A and producing it through well 16B, with injection rates gradually increasing from 5 barrels per minute (bpm) to 10 bpm over approximately 48 hours. The primary goals include assessing thermal decline, water loss, and water treatment needs under continuous flow conditions.
Previous tests at the site include a 30-day circulation test in August 2024, which maintained a constant injection rate of 10 bpm, achieving about 90% fluid recovery and maintaining temperatures near 370°F (188°C). These historical benchmarks provide valuable data for comparison as the current test progresses.
Dr. Kristie McLin, principal investigator at Utah FORGE, emphasized the importance of this extended test in resolving unknown variables critical for sustaining long-term EGS operations. The data collected will address concerns related to reservoir reliability, heat extraction, fluid retention, and system durability, which are essential for commercial viability.