Podcast Summary — Catalyst with Shayle Kann

Episode: "Digging deep for super hot geothermal"

Date: March 5, 2026
Host: Shayle Kann
Guest: Carlos Araque, CEO & Co-founder of Quaise Energy

1. Episode Overview

This episode explores the frontiers of "super hot geothermal" energy—an emerging opportunity to tap into vast, high-temperature underground resources for reliable, clean baseload power. Host Shayle Kann interviews Carlos Araque, CEO of Quaise Energy, a startup aiming to unlock geothermal energy nearly anywhere on the planet by drilling much deeper—and hotter—than traditional geothermal projects. The discussion is a deep dive into the technical, economic, and practical challenges of accessing 800°F (427°C) heat at great depths, and the potential this represents for the global energy transition.

2. Key Discussion Points & Insights

A. Why Super Hot Geothermal? (02:13)

• Clean, reliable power sources like hydro, nuclear, and geothermal are limited by geography, cost, or time to market.
• Traditional geothermal is geographically constrained: requires heat close to the surface, which exists in limited areas.
• Main hypothesis: If you drill deep enough, there's sufficient heat everywhere.
• The central questions:
  1. Can we drill deep enough (and hot enough)?
  2. Can we extract that heat efficiently?
  3. Will it be cost-effective?
• Carlos Araque believes the answer is "yes": "Yes. Yes. Yes." (03:22)

B. Traditional vs. Deep Geothermal (03:35–05:23)

• Traditional hydrothermal geothermal:
  • Drilling is shallow (~1 mile or less), targeting sub-boiling rock (~200°F), requiring groundwater and permeable rock.
  • Highly geographically limited.
• Super hot geothermal:
  • Target temperature: 800°F (427°C)—physics dictates this as optimal for water-based heat extraction.
  • Depth required: as shallow as 3 miles in geothermally active zones, up to 12 miles elsewhere.
• Quote:

  "If you are going to use water to extract heat from the subsurface, that is the ideal temperature: 800 degrees Fahrenheit. Anything above that, diminishing returns. Anything below that, you're leaving too much opportunity on the table."
  — Carlos Araque [00:11 & 05:23]

C. Drilling Technology Gaps (06:28–08:01; 14:51–16:02)

• Oil & gas industries reach similar depths, but not similar temperatures—excessive heat becomes the limiting factor, not depth.

• "The end of one is the beginning of the other": oil and gas rarely drill below 2-3 miles due to temperature, but that's the starting point for super hot geothermal.

• (Lab) physics and early field tests suggest new approaches may allow creation of fracture networks ("fracking") at depth, but no one has succeeded in real-world settings at these depths and temperatures yet.

• Quote:

  "There's no evidence whatsoever in the geological record... that you can actually drill these things mechanically from the surface. That's a unique thing."
  — Carlos Araque [16:17]

D. Why 800°F? Physics, Power, and Potential (09:17–10:37)

• Wells at 800°F deliver 10x the power output of those at 200°F, thanks to water’s supercritical properties at this temperature.
• Higher temperatures = higher efficiency for heat-to-electricity conversion.
• Geography: “Ring of Fire” regions (Pacific Rim, Iceland, Kenya, more) have these temperatures at accessible depths (~3 miles), but with deep enough drilling, anywhere could be viable.
• Quote:

  "The same wellbore... will transfer maybe 1 to 10 megawatts electric equivalent if it's flowing at 200 degrees Fahrenheit and will transfer 10 times that if it's flowing at 800 degrees Fahrenheit."
  — Carlos Araque [09:33]

E. Fracturing and Permeability at Depth (11:36–13:53)

• Permeability (self-connecting cracks in the rock) generally decreases with depth.
• At extreme depths and temperatures, lab work hints that injecting cold fluids may encourage new fractures due to density differentials, possibly making “fracking” easier, but this hasn’t been done at commercial scale.

F. Technical Challenges: Drilling & Fracturing (14:51–16:02)

• Two central challenges:
  • Drilling at high temperature (not just depth).
  • Creating/maintaining fractured permeability for fluid flow.
• Of these, drilling is the harder challenge.
• Suggests engineering and incremental evolution will progress from shallower “tier one” (~3-5 miles) to deepest systems (10-12 miles).

G. Incremental Evolution and Startup Tactics (19:30–26:54)

• Not reinventing everything:
  • Many materials and techniques from oil & gas can be adapted for "shallow" (3–5 mile) super hot geothermal.
  • Some components (electronics, elastomers, cements) need upgrades, but these are “incremental innovations.”
• Economic approach: Begin projects where wells are already drilled near the right conditions.
  • Quaise’s first project is in Oregon, where existing legacy wells provide precedent.
  • Main technical gap now is establishing a working fracture (permeability) network.
• Quote:

  "The place we picked for our first project already has holes drilled to the right temperature depth combinations. That is the key."
  — Carlos Araque [22:54]

• As projects move deeper, new technical hurdles will need to be solved.

H. Economics and Unit Costs (27:08–29:30)

• Traditional geothermal: about 50% drilling, 50% power plant cost.

• Super hot: far higher power output per well shifts the economics.

  • Drilling becomes 20–30% of LCOE (Levelized Cost of Electricity).
  • Target LCOE:
    • $50–$100/MWh depending on depth (shallow systems being cheaper).

• Drilling speed: consistency and minimizing downtime ("nonproductive time") matters more than maximum instantaneous rate.

• Quote:

  "We’re not really trying to have ungodly drilling speeds. We’re trying to have very low nonproductive time... We want to get down there regardless of depth in weeks, not years."
  — Carlos Araque [29:58]

I. Milestones to Watch For (32:17–34:54)

• Key milestone: The “flow test”—successfully producing super-hot steam from connected injector/producer wells at target temp and flow.
• Timeline (projected):
  • 2026: Flow test in Oregon at ~3 mile depth, 25-30 MW output.
  • 2028: Repeat at deeper/hotter conditions (“walk up the temperature gradient”).
• Commercialization: Shallow systems will be spun out as their own projects, demonstrating early commercial viability and providing the playbook for deep systems.
• Quote:

  "The flow test is the moment of truth... If you can see that, and you can say, look, it’s durable, it hasn’t lost temperature, it hasn’t lost flow rate, the rest is relatively straightforward."
  — Carlos Araque [32:17]

3. Notable Quotes & Memorable Moments

• "800 really is the Goldilocks zone for that supercritical property of water."
  — Carlos Araque [09:33]
• “The end of one is the beginning of the other one.” (on oil & gas vs. geothermal drilling depth/temperature)
  — Carlos Araque [06:58]
• "The price that we gain by doing so is enormous. It's unlike any other energy source out there. It dwarves everything else combined."
  — Carlos Araque [16:32]
• "I've made it the entire conversation without using 'let's go deeper' as a metaphor... that was just as deep as I wanted to go."
  — Shayle Kann [36:13]

4. Key Timestamps

• 03:33: Introduction to Carlos Araque and the traditional geothermal baseline
• 05:23: Physics behind 800°F target and depth/geography considerations
• 09:33: Power potential: 10x output at 800°F versus 200°F
• 14:51: Technical gap: high-temp deep drilling plus fracturing
• 19:30: Adapting oil & gas materials/techniques for super hot geothermal
• 22:54: Startup tactics: building from existing wells, minimizing technical risk at launch
• 27:51: Unit economics: how LCOE changes as temperatures rise
• 29:58: Drilling speed: focusing on low downtime for cost savings
• 32:17: What to watch: flow tests as the key technical milestone
• 33:47: Roadmap: plans for scaling up depth and temperature over time

5. Conclusion

The episode demystifies the promise of super hot geothermal—potentially a game-changing, global source of clean energy. Through technical explanations and real-world startup strategy, Shayle Kann and Carlos Araque lay out not only the “why” but also the detailed “how” of this ambitious goal. The main hurdles remain drilling technology and proving reliable fracture networks at unprecedented temperatures and depths. If successful, projects like Quaise's could provide scalable, affordable clean power nearly anywhere on Earth.

For Further Information

• Visit Quaise Energy: https://www.quaise.energy
• See more episodes and energy tech coverage at Latitude Media: https://www.latitudemedia.com