South Texas Geothermal Facility Enters Service
Sage Geosystems (Sage), a US-based enhanced geothermal systems (EGS) power developer, announced that its SMECI facility in South Texas is now in service. Results from a multi-month operating campaign provide an important field proof point for Sage’s proprietary EGS approach to delivering scalable baseload geothermal power. Since selling its first electricity in Q2 2026, the facility has been operating for over 120 days to evaluate subsurface pressure response, injection and production performance, water management, system efficiency, and reservoir behavior. The results met or exceeded Sage’s objectives and demonstrate Sage’s ability to engineer an EGS reservoir that repeatedly performs to maximize net power output.
Sage is now applying the SMECI facility results to the design of future projects, including its planned geothermal development at an Ormat site in Nevada. Furthermore, Sage’s modeling tool (GeoTwin) accurately predicted observed operating behaviors, providing additional confidence in the company’s ability to reliably design, predict, and manage subsurface performance.
“Our operating campaign at the SMECI facility demonstrates that Sage’s proprietary EGS approach overcomes one of the industry’s most persistent challenges, high water losses in engineered reservoirs, while delivering the consistent performance required to scale next-generation geothermal. These results validate the core elements of our approach, significantly reduce development risk, and provide a clear path toward reliable, commercial-scale geothermal power,” said Cindy Taff, co-founder and chief executive officer of Sage.
With over 120 days of operations, the SMECI facility has produced consistent results, demonstrating reliable, engineered reservoir performance, which reduces operational uncertainty and supports scalable power generation. The facility demonstrated water losses of less than 10% across multiple cycles, indicating that most of the water remains in the system, which enables Sage to capture more usable energy, increase net power output, and improve project economics. Sage’s GeoTwin modeling tool anticipated the operating behavior observed in the field, reducing uncertainty in future project performance and increasing confidence in the bankability and scalability of Sage’s proprietary EGS approach.
“Commercial geothermal isn’t just about creating a reservoir; it’s about creating one whose performance can be engineered, predicted, and consistent,” said Lev Ring, co-founder, president, and chief technology officer of Sage. “That means understanding not only how a reservoir will perform, as we are doing with our GeoTwin modeling tool, but also how efficiently it can retain water and demonstrate a path to losses below 5%. Predictable reservoirs are the foundation of commercially scalable geothermal.”
Sage’s EGS approach is designed to engineer and actively manage the subsurface as a controlled energy system. By storing water under pressure and producing it in controlled cycles, Sage can preserve pressure, minimize water and energy losses, and generate more net power from the reservoir. The results demonstrated at the SMECI facility validate the core elements of Sage’s EGS approach and provide the technical foundation to scale into larger, commercial power generation projects. Sage will continue operating the SMECI facility to further optimize performance while applying the results to the design and development of larger-scale geothermal power projects.
