Quaise Energy on track to build world’s first power plant using superhot geothermal energy

A Quaise analysis presented at the 2026 Stanford Geothermal Workshop validates the company’s belief that its first plant could produce at least 50 MW of clean, renewable electricity. That energy, produced from only a handful of wells, would be available 24/7.

Subsequent expansions of Project Obsidian at the same location are expected to bring even more energy. The second phase targets 250 MW.

“Our goal is to build out to a gigawatt in the area,” said Carlos Araque, CEO and Co-Founder of Quaise. “We believe our breakthrough drilling technology could ultimately make gigawatt scale geothermal plants viable across the globe, including in regions where geothermal has never been possible before.”

Because Project Obsidian is the first of its kind, there are many unknowns, such as the geochemistry of the rock it will tap into. Daniel W. Dichter, a Senior Mechanical Engineer at Quaise, is first author of a paper exploring these unknowns that he presented at Stanford earlier this year. Dichter has also presented other papers related to designing superhot power plants.

“Most of our analysis, which is based on several models, was dedicated to trying to understand some of these uncertainties,” added Dichter. Quaise also supports research at Oregon State University aimed at doing the same thing by recreating extreme underground conditions in the lab.

Dichter’s overall conclusion: “This analysis validates our long-held hypothesis that higher subsurface temperatures entail substantial improvements in power production. It shows us that we can get to a capacity of 50 MW of power with this system. If these first wells work the way we think they will, they will be on par with exceptionally productive oil and gas wells in terms of equivalent power output.”

According to a 2025 report from the Clean Air Task Force, “If successfully developed, [superhot rock, or] SHR could supply 63 TW of firm, carbon-free power by tapping just 1% of the world’s SHR resources – more than eight times current global electricity generation.”

Today, however, rock at those superhot temperatures can be accessed at only a few locations around the globe, such as Iceland, where it is relatively close to the surface. There are power plants under development at those locations, but none are online yet. The mother lode of geothermal energy is some 2 – 12 miles beneath the surface. That cannot be accessed today because we cannot drill down far enough. Drills used by the oil and gas industries cannot withstand the formidable temperatures and pressures found that far down. As a result, drilling becomes exponentially more expensive with depth.

Quaise aims to solve the problem with a completely new way to drill using millimetre wave energy (cousins to the microwaves we cook with) that can literally melt and vaporise rock.

Project Obsidian

The first phase of Project Obsidian will consist of two separate geothermal well systems. One will target rock at temperatures reaching as high as 365°Celsius (689°F) with an average temperature of 315°C. The other will target rock at temperatures as high as 415°C (779°F) with an average temperature of 365° C.

Why build two systems targeting different temperatures? The one targeting an average 315°C, says Dichter, “is on the cusp of what is achievable today, so it’s lower technical risk. With what we learn from that system, we’ll go to the hotter one, which is riskier.”

That follows the Quaise blueprint for developing superhot, superdeep geothermal energy worldwide. The blueprint involves three phases, or tiers, based on geothermal gradients, or how close the resource is to the surface.

“Project Obsidian is a Tier I location, able to access superhot temperatures at about 5 km (about three miles) beneath the surface. Dichter notes that the first wells at Project Obsidian will be drilled conventionally, without millimetre wave energy. That, too, is part of the Quaise blueprint, which involves a hybrid approach to drilling. Conventional drilling technologies will remove rock near the surface (what they were optimised for), followed by millimetre waves for powering through the basement rock below. Millimetre waves won’t be used “until the 365°C wells at the earliest,” Dichter said.

Tier II sites will access rock at intermediary geothermal gradients. Nearly 40% of the world falls into this category. Tier III sites will involve drilling as much as 19 km down (about 12 miles). The latter “hold the key to making superhot geothermal a truly global energy source,” according to this Quaise video. “Tier III sites could provide power to more than 90% of humanity.”

The two well systems that comprise the first phase of Project Obsidian will have a surface footprint of 20 acres. That underscores a key advantage of geothermal systems, which use less than three percent of the land required for similar solar- and wind-energy sites, according to the University of Texas at Austin.

Each of the two well systems, in turn, comprises three wells. Water will be pumped down one of these to the hot rock. The two wells on either side will capture the hot water that results from flowing through the hot rock. Contributing to the project’s small footprint: the pipes conveying water to and from the SHR formation have a maximum inner diameter of only about 10 in.

The first phase of Project Obsidian will also have a seventh, or confirmation, well. This one – the first to be drilled – will give the Quaise team key information on variables including the geomechanical, or physical, properties of the superhot rock. These data will dictate, for example, how the team fractures rock at depth to create pathways for water to flow.

The confirmation well is expected to be in operation later this year.

What will be learnt?

Project Obsidian will answer many questions related to the Quaise approach to geothermal engineering. Among them:

• What is the enthalpy, or heat content, of the geothermal fluid at depth?
• What impurities, such as dissolved silica, will be present in the water coming up from the SHR?
• What is the best design for the Project Obsidian power plant?
• What will come up the pipes from the SHR resource, water or steam?

Dichter emphasises that based on the incoming data, “we will probably make many adjustments. We’re not attempting to convey that we’ve solved all the problems, but that we see a lot of potential, and we see a pathway to a very useful [power]-generating asset.”

In addition to Dichter, other Quaise authors of the paper presented at the 51st Stanford Geothermal Workshop held in February 2026 are Trenton T. Cladouhos, Vice President, Geothermal Resource Development; Quinlan Byrne, Geoscientist; Greg Szutiak, Drilling and Completions Technical Advisor; and Victor J. Rustom, Field Operations Manager.

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