『Mike Eros - Chief Geoscientist of Sage Geosystems』のカバーアート

Mike Eros - Chief Geoscientist of Sage Geosystems

Mike Eros - Chief Geoscientist of Sage Geosystems

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 In this episode, we’re diving into the world of subsurface energy storage and geothermal power with Mike Eros, Chief Geoscientist at Sage Geosystems, where he’s pioneering geo-pressured geothermal and long-duration energy storage solutions. A former ExxonMobil subsurface expert, he’s now helping reshape how we tap into and store Earth’s heat.We explore how Mike transitioned from oil and gas into geothermal, the potential of geo-pressured systems for grid-scale power and storage, and Sage Geosystems’ groundbreaking projects reshaping the future of energy.Episode At-a-Glance* Storage + Geothermal: Sage merges long-duration pressure storage with geothermal heat extraction — delivering baseload + peaking power from the same well.* From O&G to Geo: Subsurface and drilling skills transition directly into geothermal; the biggest bottleneck is industry awareness, not ability.* EarthStore Pilot: First 3 MW project in Texas test results showing 70–75% storage efficiency with <2% fluid loss — built using off-the-shelf drilling tools.* DoD + Meta: Early customers want resilience (military bases) and 24/7 clean power (data centers).* Ormat Partnership: Taps into existing interconnections and Ormat’s equipment procuring capabilities — potentially reducing geothermal timelines from years to months.* Superhot Roadmap: Drill to ~16,000 ft, then frack deep to access 300°C rock for 10× power density using mostly standard oil & gas gear.* The Big Blockers: Organic-Rankine Cycle (ORC) turbine and broader equipment delays, interconnection queues, and lack of drilled pilots — not geology.⏱️ Timestamps (Notes below)[1:04] What got Mike into Geothermal? What was his career?[6:14] How do Sage’s Pressured Geothermal Systems work?[16:59] Why do we push the working fluid lung-like “huff-n-puff” operations in fractures?[21:06] What are the variables affecting the economics on your projects and the efficiencies on your storage projects? How can we make geothermal scale faster?[29:55] How does your team measure success? What are the longer term goals?[33:57] How is your team exploring using super critical CO2 as a working fluid?[36:15] What does it look like to build out a Sage site from ideation to creation?[40:59] How is your team engaging with different partners to get things done? [43:07] What are the risks and challenges your team is facing?[45:58] How does financing these different projects look?[49:54] How does your team work with different locales to help integrate projects with the community? What about other regulatory frameworks and environmental risks your team has to handle?[59:31] How are the steps back in supporting certain renewables like wind and solar impacting your team?[1:04:49] Lessons from working with San Miguel Electric Cooperative and ERCOT[1:11:07] How is your team approaching permitting in regards to your work in Altascosa County?[1:13:50] How has your team been approaching the grid interconnection process?[1:15:22] Digging in on the project with the US Air Force in Starr County.[1:19:07] How is your team developing and navigating partnerships with other military branches and the broader US military?[1:22:31] Sage and Meta’s partnership and how the team is approaching it.[1:25:59] Partnership with Ormat in the west.[1:29:29] Where do you see this partnership with Ormat going?[1:31:50] How have technological advancements in energy and drilling contributed to geothermal today?[1:40:08] How can we get communities and the government more excited about geothermal? What can they do to help?[1:45:18] What’s coming up for Sage?[1:48:23] If you had a magic wand, what problem in geothermal would you solve today?Additional Notes* Regarding 10 to 20% dilation - As an additional note, the larger the volume put in the ground compared to the percent that is brought out/smaller volumes allows the system to stay above fracture opening pressure. This maintains sufficient presssure in the fracture to keep the system open without proppant.* Regarding the mention of $0.065/kWh - Mike misspoke on the 10-12 cents. He meant that the costs would fall to the lower side with scale with a target of 6 to 7 cents per kWh. Additionally, for energy storage, the team is targetting Long-duration CAPEX of $2.25M/MW.🔬 Sage’s Tech: What Makes “Geo-Pressured Geothermal” Unique?If you’re new to Sage, their system is: part geothermal, part inverted pumped hydro.Instead of just drilling into hot dry rock and circulating water, they:* Drill mostly vertical wells, with a short deviation.* Create a lung-shaped fracture network beneath the surface.* Cycle fluid in a “huff-and-puff” pattern—injecting to build pressure, then releasing it to run a surface turbine. Where it fits in:* 8-12 hour duration long-term storage* Ideal for solar-heavy regions like Texas & California, as well as Australia* Cheaper + higher energy density than lithium-ion beyond 4 hour discharge durationsSo far, this has led to:...
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