Quaise’s superhot geothermal wins $180M Series B

Estimated reading time: 5 minutes · Last updated: 8 September 2026

Quaise Energy announced the final close of a $180 million Series B that it says will accelerate development of utility-scale “superhot” geothermal. The round includes a $35 million investment from Nabors Industries and, according to a Business Wire summary, establishes a strategic framework to build a first-of-its-kind plant, as first reported by Yahoo Finance. Superhot geothermal taps deeper, higher-temperature rock than conventional geothermal and relies on new drilling methods to access those volumes. Quaise said the funding advances its millimeter-wave drilling approach and represents a fresh private-sector bet that geothermal can help meet rising electricity demand, notably from large data centers.

We are unlocking the most powerful clean energy source on Earth, and the Series B signals deep conviction across a wide range of investors,

Carlos Araque, CEO and President of Quaise Energy

What the $180 million round means for Quaise and its partners

Quaise closed a $180 million Series B that the company says will fund work toward a utility-scale superhot geothermal plant. A Business Wire press release states the round includes a $35 million investment from Nabors Industries and establishes a strategic framework between Quaise and Nabors to pursue the world’s first superhot geothermal project. Quaise said the financing is equity, not debt, and that it is intended to accelerate engineering, testing and commercial partnerships rather than to finance immediate construction.

Quaise’s chief executive, Carlos Araque, is quoted describing the round as a signal of investor conviction. Nabors President and CEO Anthony G. Petrello is quoted on how the partnership leverages drilling expertise. Those statements appear in the company release; they reflect the two firms’ public framing of the deal rather than independent technical verification of outcomes such as planned site or timetable.

How ‘superhot’ geothermal differs from conventional projects

Traditional geothermal power relies on naturally hot reservoirs near the surface or on steam from features such as geysers, which are geographically limited. Enhanced geothermal expands the available resource by drilling deeper and circulating fluids to extract heat where natural vents do not exist. Superhot geothermal targets even hotter rock at greater depth to raise power density and thermal output per wellbore, enabling larger plants in a wider set of locations.

Quaise says it uses millimeter-wave drilling, a method adapted from high-frequency physics, to reach temperatures and depths conventional rotary drills cannot. The material names cross-sector borrowing from oil-and-gas drilling and, in some cases, fusion research; however, the article does not provide measured depth or temperature targets, so those engineering parameters remain to be confirmed by the company’s test data.

Why investors and policy makers are taking another look

Two drivers underlie the renewed interest: rising baseload power needs from large-scale computing, and a policy environment Quaise described as broadly supportive of geothermal. Quaise links the investment backdrop to expanding electricity demand from artificial-intelligence workloads and data centers, a rapidly growing load that requires reliable, dispatchable clean energy.

The piece cites Rhodium Group geothermal analysis that geothermal could supply up to 64 percent of the expected growth in data-center energy demand by the early 2030s. That projection is offered as a market-sizing view that helps explain why private capital and industrial drillers like Nabors are taking stakes in startups attempting to scale deeper geothermal technologies.

Technical and non-technical hurdles on the route to scale

Scaling a lab or pilot method to multi-gigawatt commercial capacity requires resolving engineering challenges, permitting and social acceptance issues. Latitude Media said geothermal has a chance to avoid some of the political bottlenecks that have affected other technologies, but it also warned that public backlash and regulatory hurdles remain potential constraints. Specific permitting timelines, test results for millimeter-wave drilling and environmental assessments are not yet public and will shape whether projects move beyond demonstration.

The announcement frames the Series B as a major step, not a final delivery. The company must still demonstrate reliable, repeatable drilling at scale, secure sites and grid interconnection, and win regulatory approvals. Those are the conventional stages every new large-scale energy technology must clear before investors will underwrite construction and long-term offtake.

Positive and negative pathways to commercial superhot geothermal

The bottom line

The $180 million round positions Quaise to move from laboratory work toward larger-scale demonstrations of its millimeter-wave drilling concept. The funds and Nabors’ participation reduce some commercial uncertainty, but key technical validations and regulatory clearances remain undisclosed in the sourcing. If the company can publish independent drilling results, secure test sites and lock in grid access or offtake, superhot geothermal could meaningfully expand where dispatchable geothermal is viable. Absent those milestones, the financing is an important vote of confidence rather than proof of imminent large-scale delivery.

What to watch

• Watch for Quaise and Nabors to announce a pilot site and a timetable for drilling demonstrations; no date has been set.
• Watch for the company to publish independent test data validating millimeter-wave drilling performance; no date has been set.