Geothermal's Next Big Test: Cindy Taff on Sage Geosystems, AI Power and Scale
What if geothermal energy could deliver reliable, 24/7 electricity far beyond the volcanic regions and natural hot-water reservoirs where it's traditionally been developed? In this episode of Green Giants: Titans of Clean Energy, host Wes Ashworth sits down with Cindy Taff, CEO of Sage Geosystems, to explore how next-generation geothermal technology could unlock an enormous new source of clean, dependable power. After approximately 35 years at Shell, where she led unconventional well operations across five countries and oversaw roughly $1 billion in annual spending, Cindy made an unexpected career move. She brought her drilling, subsurface engineering, and operational expertise into geothermal, with a mission to make energy production from hot, dry rock more predictable, scalable, and affordable. At the center of the conversation is Sage's proprietary Pressure Geothermal technology, which uses engineered underground reservoirs and carefully controlled pressure cycles to recover water, reduce pumping requirements, and potentially improve the economics of geothermal power generation. What you'll learn in this episode: Geothermal beyond traditional hot spots: How enhanced geothermal systems (EGS) could dramatically expand where geothermal energy can be developed. A different approach to underground energy: How Sage uses pressure management to address two longstanding challenges: water loss and the energy required to circulate water. Real operating results in Texas: What Sage's SMECI energy-storage facility demonstrated through more than 120 days of cycling, including reported water losses below 10% and strong predictive results from its GeoTwin digital modeling system. The next commercial test: Why Project Vector at Ormat's Blue Mountain facility in Nevada is a critical step toward proving sustained geothermal heat extraction and electricity production. The economics of geothermal at scale: Why drilling costs, thermal performance, water recovery, net megawatts, and financing matter more than a technology simply working in the field. AI and data center electricity demand: How firm, around-the-clock geothermal power could complement solar, wind, storage, and natural gas while helping meet growing electricity needs. Oil and gas expertise as an advantage: Why existing drilling infrastructure, experienced engineers, project managers, and energy workers could dramatically accelerate geothermal deployment. Cindy also shares why she prefers thinking about energy expansion rather than replacing one energy source with another, and what it will take for geothermal to become a mainstream part of the global energy mix. This conversation goes beyond geothermal's theoretical potential. It's about what has actually been demonstrated, what remains unproven, and how innovative engineering could transform the future of energy production. Episode chapters 00:00 Introduction to Cindy Taff and Sage Geosystems 01:22 Leaving Shell to pursue geothermal 03:00 Energy expansion versus energy transition 06:43 How next-generation geothermal works 10:19 Sage's Pressure Geothermal technology 14:51 SMECI operating results and water recovery 18:02 GeoTwin modeling and predicting performance 21:11 Project Vector and the Ormat partnership 25:16 The economics of commercial geothermal 29:55 Moving from technology risk to infrastructure investment 31:30 AI data centers and 24/7 geothermal power 35:40 The opportunity for oil and gas professionals 37:10 The future of geothermal energy Learn more and connect: Sage Geosystems: https://www.sagegeosystems.com Cindy Taff on LinkedIn: https://www.linkedin.com/in/cindy-d-taff-53b77a57/ Subscribe to Green Giants for more conversations with the leaders advancing clean energy, grid infrastructure, energy storage, and the technologies shaping our energy future. Wes Ashworth: https://www.linkedin.com/in/weslgs/ Email: wes@leegroupsearch.com https://leegroupsearch.com/green-giants-podcast/ https://leegroupsearch.com/







