Episode Summary
Executive Summary: This episode explores geothermal’s comeback as a clean, firm power source for rising AI and data center demand. Host Shail Khan and Zanscar CEO Carl Hoyler trace geothermal’s U.S. history, explain why the industry stalled, and detail how modern exploration, better data, and EGS could unlock tens to hundreds of gigawatts—if permitting, drilling costs, and subsurface risk can be managed.
Main Topics: Geothermal’s U.S. history and long stagnation (Priority: 5/5): Carl Hoyler explains that geothermal power began in the 1960s at The Geysers in California, grew quickly, then largely stalled through the 1990s and 2000s because the industry struggled to replicate early successes. Why geothermal exploration failed early (Priority: 5/5): The episode emphasizes exploration risk: early developers chased surface indicators like hot springs and steam, but many deeper wells turned out dry because surface signals were unreliable and the best resources were harder to detect. Conventional hydrothermal vs. EGS (Priority: 5/5): The conversation distinguishes naturally occurring hydrothermal systems, which require heat, water, and permeability, from enhanced geothermal systems (EGS), which aim to engineer permeability and add water where the rock is hot but not naturally productive. Modern exploration and development workflow (Priority: 4/5): Hoyler walks through the stepwise process: shallow geophysical studies, temperature gradient holes, slim wells, flow tests, injection wells, reservoir modeling, and then power plant construction and grid interconnection. Speed, permitting, and capital intensity (Priority: 4/5): The discussion highlights that geothermal can still take years to develop, but timelines may compress to 3–4 years with better permitting, categorical exclusions for exploration, and more efficient project execution. Geographic and market potential (Priority: 5/5): Near-term geothermal remains strongest in tectonically active regions like the western U.S., but the speakers argue that the total U.S. resource base is enormous and could play a major role in meeting clean firm power demand.
Key Arguments: Geothermal stalled not because the resource disappeared, but because early exploration methods were too crude and produced too many dry holes, raising capital risk. Surface hot springs are often misleading; many productive geothermal systems are “blind” and only identifiable through drilling and better subsurface data. Conventional geothermal is de-risked by proving temperature, permeability, and injectivity step by step, reducing the chance of expensive failures. EGS expands the opportunity set by engineering rock permeability rather than depending entirely on naturally permeable reservoirs. Geothermal is now well-positioned because data center and AI load growth creates strong demand for clean, firm, 24/7 power. Permitting reform matters as much as technology: exploration can potentially proceed faster under categorical exclusions, and construction timelines can be shortened in favorable jurisdictions. The western U.S. and other tectonically active regions contain enough geothermal potential to matter at national scale, especially with conventional resources that do not require first-of-a-kind risk.
Data Points: Transition AI conference date: June 12, 2025 - Latitude Media promotional segment at the start of the episode Conference location: Boston - Latitude Media’s fourth Transition AI conference Podcast ticket discount: 10% off - Promo code for podcast listeners at Latitude Media events Promo code: latitude pods 10 - Code mentioned for conference ticket discount Hot gradient estimate: ~25°C per kilometer - General geothermal gradient described by Carl Hoyler Typical geothermal drilling depth: 4 to 5 kilometers - Approximate depth needed in many places to reach steam temperatures Temperature gradient hole cost: tens of thousands to hundreds of thousands of dollars - Early-stage exploration drilling cost Slim/mini production well depth: a few thousand feet to 5,000–6,000 feet - Intermediate drilling step to confirm permeability and flow Slim/mini production well cost: $1M to $4M - Rough order of magnitude to prove a resource New Mexico production well depth: ~8,000 feet - Example from an operating power plant New Mexico production well output: 15 MW net - Single well output sufficient for about 15,000 homes day and night Customer devices aggregated by EnergyHub: 2.5 million - Sponsor mention about virtual power plants Dispatchable VPP capacity: 3.4 GW - Sponsor mention converting customer devices into grid capacity Equivalent grid capacity: more than three nuclear reactors - Sponsor comparison for 3.4 GW of VPP capacity Historical geothermal development timeline: over 5 years, often up to 10 years - Typical historical start-to-COD timeframe Potential compressed project timeline: 3 to 4 years - Best-case geothermal development timeline in favorable settings Lightning Dock turnaround: less than 12 months - Zanscar example from acquisition to grid tie-in for a new well Depth of new Lightning Dock production zone: 4 times deeper than the prior production zone - Describes the new deeper target at the field Geographic opportunity share: about one-third of continental land masses - Areas with sufficient heat flow/tectonic activity for near-term geothermal Near-term U.S. resource potential: hundreds of gigawatts to terawatts - Combined conventional and EGS potential Conventional geothermal near-term potential: tens of gigawatts; some estimates 100 GW+ - Resource base that could be developed without first-of-a-kind risk
Pivotal Quotes: "“We really are talking about hundreds of gigawatts to terawatts of resource potential.”" — Carl Hoyler: Summary of near-term conventional and EGS geothermal potential in the U.S. "“Most of these convective cells of hot water underground are not coming to the surface.”" — Carl Hoyler: Explaining why surface hot springs are often a poor indicator of productive geothermal resources "“Geothermal was recently given a categorical exclusion for the exploration activities of confirming and verifying a resource.”" — Carl Hoyler: Discussion of permitting reform and faster project development
Implications: Geothermal is emerging as a credible clean-firm option for AI-era load growth, but scaling depends on better subsurface intelligence, cheaper drilling, and streamlined permitting. If those improve, geothermal could become a major dispatchable resource in the western U.S. and beyond.