Episode Summary
Executive Summary: David Roberts interviews Quaise CEO Carlos Araque about using millimeter-wave (microwave) drilling to reach superhot geothermal resources several miles underground, where water becomes supercritical and yields far more energy. The conversation covers why conventional drilling fails at those depths, how Quaise’s contactless drill works, the economics of superhot geothermal, and the company’s plan to scale from a 50 MW Oregon project toward massive, geographically flexible clean energy infrastructure.
Main Topics: Why superhot geothermal matters (Priority: 5/5): Araque argues the real prize is 300–500°C rock, where water can become supercritical and geothermal output jumps dramatically, enabling much higher power density and industrial heat use. Limits of conventional drilling (Priority: 5/5): Traditional oil-and-gas-style drilling cannot solve the combined problems of depth, heat, torque transmission, bit wear, and cuttings removal needed to reach superhot resources. How Quaise’s millimeter-wave drill works (Priority: 5/5): Instead of a physical bit, Quaise uses surface-based millimeter waves (described as microwaves) to pulverize rock into dust, with gas blowing cuttings out through a waveguide. Economics and scale (Priority: 5/5): The company frames its technology as delivering power and heat at parity with gas or better, with very high returns on invested drilling energy and a path to grid-scale deployment via existing capital structures. Surface footprint, siting, and operations (Priority: 4/5): Quaise claims compact, low-land-use power plants that can potentially sit near demand centers, reducing transmission needs and making geothermal less geography-dependent over time. Environmental and operational risks (Priority: 4/5): Roberts probes water use, earthquakes, noise, and land impact; Araque argues deeper dry-rock systems reduce water losses and avoid faults, lowering seismic risk. Business model and market strategy (Priority: 4/5): Quaise positions itself as an infrastructure/technology enabler rather than just a power developer, aiming to unlock an industry-wide shift toward drilling for heat instead of hydrocarbons.
Key Arguments: Superhot geothermal is valuable because 300–500°C rock enables supercritical water and a step-change in energy output, not just incremental gains. Conventional drill bits fail at these depths because of wear, poor energy transfer from the surface, and inability to remove cuttings efficiently. Millimeter waves allow drilling without physical contact, placing the machinery at the surface where repairs are simpler and energy delivery is more effective. The drill is tuned to rock-specific frequencies so the rock absorbs energy efficiently and is pulverized into dust. Closed-loop dry-rock geothermal can bring its own water and recycle it, reducing dependence on local aquifers and minimizing losses in tight deep formations. The resource is massive enough to support civilization-scale energy supply; the constraint is not resource size but commercial and industrial scaling. Quaise sees its core value in enabling large capital deployment, not in protecting a closed, proprietary solution forever. The first project in Oregon is meant to prove commercial viability at roughly 50 MW before scaling to multi-well, multi-hundred-megawatt or gigawatt systems.
Data Points: Target rock temperature: 300–500°C - Araque says Quaise aims for the superhot geothermal resource range. Supercritical water threshold: 375°C (about 700°F) - Temperature at which water becomes supercritical if pressure is sufficient. Pressure threshold for supercritical water: 22 MPa - Needed to reach supercriticality; Araque says pressure is available at depth. Typical geothermal depth: 500 feet to 1–2 kilometers - Roberts and Araque describe conventional geothermal wells as relatively shallow. Quaise first Oregon well depth: 2 miles - First commercial project is said to be under construction in Oregon. Potential maximum depth: 12 miles - Araque says the technique could in principle drill as deep as 12 miles. Energy gain at supercriticality: 10x - Araque repeatedly describes the supercritical phase-change jump as roughly tenfold. Available temperature with current oil-and-gas tools: 150–200°C - Araque says conventional drilling can reach hot but not superhot conditions. Power to run drilling: 1–5 MW - He says standard oilfield equipment already provides enough power for the system. Energy return on drilling investment: 1,000x over asset life - Araque says the completed system returns far more energy than it consumes to drill. Minimum economic project size: 30–50 MW - He says the smallest sensible deployment is a couple of wells at this scale. Gigawatt-scale field: About a dozen wells - Araque says repeating two-well blocks could yield gigawatt-scale output. Well spacing for durability: Hundreds of feet - Spacing depends on desired lifespan, from roughly hundreds of feet for shorter life to more for 50 years. Industrial heat coverage: About 50% of industry - Araque says roughly half of industrial heat demand is at or below 500°C. Water removal claim: More water in the subsurface than in all oceans combined - Used rhetorically to argue water is a siting/permitting issue, not a fundamental technical limit. World energy use today: 20 terawatts - Araque contrasts current global use with geothermal potential. Geothermal potential: 100 terawatts - He frames geothermal as a resource larger than present global demand. Exploration tier one: Within the first 5 km - He says the first tier of resources is within the first five kilometers, around 100 GW potential. Heat-of-use business metric: $3 per million BTU - Araque says geothermal heat can match gas-parity economics. Electricity cost target: $50–$100 per MWh - He says firm power can be delivered at these costs without delivery/storage/transmission adders. Drill demonstration depth: 100 meters to 1,000 meters - Current tests are said to span this range. Demonstration drill diameter: 4 inches - Araque says commercial drilling is currently at four-inch holes, with 6–8 inches also possible.
Pivotal Quotes: "the goal of Quase is to go hotter, not deeper, but they're related." — Carlos Araque: He reframes the company’s mission around temperature rather than depth for its own sake. "the drill is the gap that closes all gaps." — Carlos Araque: He argues the drilling technology is the key bottleneck that unlocks the whole geothermal opportunity. "the sun will stop shining on us before the earth loses its internal heat." — Carlos Araque: He emphasizes the vastness and durability of the geothermal resource.
Implications: If Quaise works, geothermal could become a firm, compact, globally deployable primary energy source for both electricity and industrial heat, reducing reliance on fossil fuels and transmission-heavy grids while repurposing oilfield capital and expertise toward clean energy.