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Quaise raises $180 million for superhot geothermal
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Quaise Energy said on August 27 it closed a $180 million financing round, including $35 million from Nabors, to fund the Obsidian Project in Oregon and trial microwave drilling to reach rock at 300 °C–500 °C. The startup plans to use a gyrotron — a high-frequency millimetre-wave generator developed for fusion research — to ablate rock without a drill bit and target supercritical conditions more than 5 km down. Phase I is scoped to deliver 50 MW with power expected on the grid by 2030, and Phase II is discussed at 250 MW as the company explores larger-scale deployment.
Key takeaways
- Funding: Quaise Energy closed a $180 million financing round on August 27, 2026, which included a $35 million contribution from Nabors.
- Technology: The Obsidian Project will trial a gyrotron to perform rock ablation with no contact, targeting rock temperatures between 300 °C and 500 °C.
- Site and capacity: The Obsidian lease covers 1,334 acres in Deschutes National Forest and benefits from a geothermal gradient of about 100 °C per kilometre; Phase I targets 50 MW with power by 2030 and Phase II aims for 250 MW.
- Partnership: Nabors will supply the dedicated land rig for the project and will fold in its reservoir modelling, well design and drilling strategy.
Table of contents
How a gyrotron replaces a drill bit
Quaise plans to rely on a gyrotron — a millimetre-wave generator originally built to heat plasma in fusion experiments — to heat and vaporise rock at depth rather than cut it with a rotating bit. The company describes the process as rock ablation with zero contact: focused microwave energy fractures and removes material without carbide teeth or drill collars wearing away.
That distinction matters because conventional drill bits degrade rapidly as temperature and hardness rise; the deeper the hole, the higher the mechanical and materials challenge. Using millimetre-wave energy shifts the engineering problem from metallurgy to power delivery, wave coupling and managing the borehole environment at several hundred degrees Celsius. The gyrotron therefore changes the failure modes a project must solve, but it introduces new ones: high-power transmission into a confined bore, and the need to control how ablated material is evacuated.
Why Obsidian’s geology shortens the climb to superhot rock
Quaise selected a 1,334‑acre area in Deschutes National Forest because the geothermal gradient there is unusually steep for sedimentary basins, at about 100 °C per kilometre. That gradient means rock temperatures that typically require far greater depth elsewhere are found at a shallower vertical section in this site.
With a gradient of about 100 °C per kilometre, the company is aiming at basement targets described for Phase I at 315 °C and 365 °C. In plain terms, a favourable gradient reduces the mechanical length of hole Quaise must power through before the gyrotron becomes the planned tool of choice, and it is the geological reason the team argues the site can reach supercritical conditions without the extreme depths that make many other locations impractical.
Funding, partners and the phased capacity plan
Quaise said the final close of $180 million will bankroll the Obsidian Project’s next steps, and that Nabors committed $35 million as part of the round. Nabors agreed to supply a dedicated land rig and to embed the company's reservoir-modelling tools together with its well design and drilling strategy into the field programme, transferring oil-and-gas operating experience into the geothermal plan.
Quaise presents the build in phases: Phase I is set to deliver 50 MW with power expected on the grid by 2030; Phase II is described at 250 MW, and the company has discussed gigawatt-scale deployment farther ahead. For Phase I the team will use conventional drilling to penetrate the upper formations and reserve gyrotron deployment for the hotter basement at the 365 °C target described in the project materials.
Technical and historical limits that will shape the outcome
Deep, hot drilling has a precedent that underlines the risks. Soviet engineers drilled to 12,262 metres by 1989 in a project that later stalled because temperatures at the bottom exceeded predictions and the rock behaved plastically; that programme was abandoned in 1994. Quaise acknowledges the leap from shallow geothermal to more than 5 km is substantial and that new thermal and mechanical behaviours can emerge at those conditions.
For Obsidian the immediate technical uncertainties are whether the gyrotron can reliably transfer energy into intact rock at the planned depths and how ablated material and fluids will be managed at 300 °C–500 °C. On the logistics side, integrating a Nabors land rig with microwave equipment, securing the necessary forest and energy permits on 1,334 acres and validating reservoir performance under supercritical conditions are concrete milestones the project must clear before commercial output.
| Item | Value/Detail |
|---|---|
| Total funding | $180 million |
| Nabors contribution | $35 million |
| Site area | 1,334 acres (Deschutes National Forest) |
| Target rock temperatures | 300 °C–500 °C |
| Phase I capacity / target year | 50 MW; power expected by 2030 |
| Phase II capacity | 250 MW |
How this could play out
The case for
- If the gyrotron can deliver focused energy at depth and operators solve borehole material removal, a single superhot well could yield several times the output of a conventional geothermal well, validating the Phase I 50 MW target.
- The combination of a favourable geothermal gradient at the Obsidian site and Nabors’ drilling and modelling capabilities could shorten technical risk by matching established rig operations to the novel microwave step.
The case against
- Unexpected thermal-mechanical behaviour at temperatures above 300 °C could limit the achievable permeability or make reservoir behaviour unpredictable, repeating historic deep‑drilling failures.
- Permitting, forest‑land use constraints and the engineering task of integrating high‑power microwave equipment with a land rig could delay or raise the cost of moving from pilot wells to the Phase I 50 MW target.
What to be careful about
- The gyrotron approach is unproven at the combined depths and temperatures Quaise targets; high‑power transmission and borehole coupling remain technical risks.
- Superhot reservoir behaviour is uncertain — historical deep drilling recorded plastic deformation and temperatures above model expectations, which can undermine well integrity and flow.
- Regulatory and land‑use approvals on 1,334 acres in Deschutes National Forest could add schedule and cost risk before grid connection.
- Integrating Nabors’ land rig with new microwave engineering introduces operational and supply‑chain dependencies that could slow deployment.
The bottom line
Quaise’s $180 million close, with $35 million from Nabors, shifts a speculative geothermal concept into a funded field programme. The Obsidian Project pairs a site with an unusually steep gradient and an oil‑field drilling partner to attempt a novel microwave ablation method at temperatures where water becomes supercritical. The technical hurdles are tangible — power delivery, borehole management and uncertain reservoir physics at hundreds of degrees — but the company’s phased 50 MW by 2030 plan gives a clear early milestone. Success would change where geothermal is viable; failure would reinforce why extreme‑depth heat has proved difficult in the past.
What to watch
- watch for Phase I to deliver 50 MW and for power to reach the grid by 2030; the company lists 2030 as its target year.
- watch for Quaise and Nabors to report field tests that combine the Nabors land rig with gyrotron drilling; no date has been set in public materials.
- watch for Quaise to confirm reservoir temperatures at target depths, specifically the Phase I targets described at 315 °C and 365 °C; no date has been set.
Frequently asked questions
What is a gyrotron and why is it relevant to geothermal drilling?
A gyrotron is a high‑power millimetre‑wave generator developed for heating plasma in fusion reactors; Quaise plans to use it to ablate rock without a rotating drill bit so that material is vaporised rather than mechanically cut at temperatures of 300 °C–500 °C.
What capacity does Quaise expect from Obsidian’s phases?
Quaise describes Phase I as delivering 50 MW with power expected on the grid by 2030, and Phase II as aiming for 250 MW, with discussions of gigawatt‑scale deployment later.
Why is the Deschutes National Forest site favourable?
The Obsidian lease covers 1,334 acres and has a reported geothermal gradient of about 100 °C per kilometre, which brings the 300 °C–500 °C target temperatures closer to the surface than in many other sedimentary basins.
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