ARPA-E bets on materials that can survive superhot geothermal wells

Overview

Updated 1 hour ago

On November 12, the Department of Energy's Advanced Research Projects Agency-Energy (ARPA-E) selected eight teams to share up to $30 million for one problem: building wells that survive rock hotter than 375 °C and under more than 22 megapascals of pressure. Commercial geothermal equipment tops out near 220 °C. Above that, steel casing, Portland cement and off-the-shelf electronics tend to fail.

The eight awards range from $2.6 million to $6.3 million and split into two jobs. Some teams are redesigning the well itself — new alloys, composite pipe, corrosion-resistant casing. Others are working on how to pull heat out of hot, ductile rock that does not fracture the way cooler rock does. ARPA-E says the payoff is 10 to 20 gigawatts of baseload power at under $30 per megawatt-hour by 2040.

Why it matters

U.S. geothermal produces under 4 gigawatts today; superhot wells could more than triple output per well, if the materials last 15 years.

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Key Indicators

$30M

Maximum combined funding

ARPA-E selected eight projects for up to $30 million combined, subject to award negotiations.

Selected projects

Four national laboratories, three universities and one company lead the teams.

375 °C

Superhot threshold

ARPA-E defines superhot geothermal as rock above 375 °C and above 22 megapascals.

220 °C

Current equipment ceiling

Commercial off-the-shelf geothermal equipment is limited to roughly this temperature.

10–50 MWe

Power per well

Current enhanced geothermal wells produce about 10 megawatts-electric; superhot wells could reach 30 to 50.

15 years

Target well life

ARPA-E's program requires well designs rated for 15 years or more in superhot conditions.

15,000 GW

Estimated U.S. geothermal resource

ARPA-E puts the domestic resource at 15,000 gigawatts; installed utility-scale capacity is under 4 GW.

Voices

Curated perspectives — historical figures and your fellow readers.

Organizations Involved

Advanced Research Projects Agency-Energy (ARPA-E)

Federal agency within the Department of Energy

Runs the SUPERHOT program and selected the eight projects

The Department of Energy office that funds early-stage energy technology that private investors consider too risky.

XGS Energy

Private geothermal developer

Selected for a $3 million award, pending negotiation

Houston-based developer adapting its thermally conductive cement and well design to superhot conditions.

Blade Energy Partners, Ltd.

Engineering consultancy

Selected for the largest award, $6.3 million, pending negotiation

Houston firm that received the largest SUPERHOT selection to design and test a complete superhot well system.

Lawrence Livermore National Laboratory

U.S. Department of Energy National Laboratory

Selected for a $5.5 million award, pending negotiation

Livermore lab leading a project on well design and fluid techniques for extracting heat from superhot rock.

Oak Ridge National Laboratory

National Laboratory

Selected for a $3 million award, pending negotiation

Oak Ridge lab developing a glass fiber-reinforced composite pipe to replace carbon-steel casing.

Pacific Northwest National Laboratory (PNNL)

Department of Energy National Laboratory

Selected for a $2.6 million award, pending negotiation

Pacific Northwest lab building a laboratory simulator to test well materials under superhot conditions.

Timeline

January 2025 November 2026

3 events Latest: 2 days ago

November 2026
Selections reach the geothermal trade press
Latest Publication

ThinkGeoEnergy reports the eight selections; XGS Energy separately confirms its award.
2 days ago
Eight projects selected for up to $30 million
Funding selection

Awards range from $2.6 million to $6.3 million and cover well materials, well design and heat extraction from superhot rock.
3 days ago
January 2025
ARPA-E opens the SUPERHOT program
Program launch

The funding call asks for well construction technologies rated for 15 years and heat-extraction methods that hold output for a decade.
January 16th, 2025

Scenarios

All eight selections convert into funded awards

Likely Resolves by Q2 2027

Discussed by: ARPA-E's own selection notice, which states awards are contingent on negotiation

Selections are not commitments. Each team negotiates scope and budget with DOE, and the agency can cancel at any point in that process. If all eight convert, roughly $30 million moves from announced to obligated and the projects begin testing materials and designs.

A SUPERHOT team reports a well above 375 °C

Uncertain Resolves by End of 2031

Discussed by: ARPA-E program documents describing field validation as the program's endpoint

The hardest test is not a lab coupon but a well in the ground. A team would need to drill into rock above 375 °C and keep the wellbore intact long enough to measure it. Success would move superhot geothermal from modeled to demonstrated.

Laboratory testing projects a 15-year well life

Possible Resolves by End of 2029

Discussed by: Blade Energy Partners, Oak Ridge, Los Alamos and PNNL project descriptions

Several teams are running accelerated aging tests: repeated heating and cooling, high stress, corrosive fluids. A credible 15-year projection from those tests would give investors and utilities a number to underwrite, even before a field well exists.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

1974–1995

Fenton Hill hot dry rock experiment (1974–1995)

Los Alamos scientists drilled into hot granite at Fenton Hill, New Mexico, and fractured it to circulate water through rock with no natural steam. A 1977 test extracted heat from the first engineered reservoir; a deeper, hotter reservoir followed in the 1980s.

Then

The experiment proved heat could be pulled from dry rock, the concept behind today's enhanced geothermal systems.

Now

The program wound down in the mid-1990s without a commercial plant, largely as energy prices fell and funding shifted. The temperature limits that stopped deeper work are the ones SUPERHOT targets.

Why this matters now

Fenton Hill showed the geology works. It did not produce a well that lasted. SUPERHOT is funding the materials and construction problem that the experiment left open.

2009

Iceland Deep Drilling Project well IDDP-1 (2009)

Drillers at Krafla in Iceland hit rhyolite magma at roughly 2,100 meters, far shallower than expected. The well produced steam at temperatures well beyond what standard geothermal turbines and casing are built to handle.

Then

The well was tested but its casing and wellhead could not tolerate the heat and corrosive chemistry for long-term production.

Now

IDDP-1 became the reference case for both the promise and the materials failure of superhot geothermal.

Why this matters now

It is the closest thing to a real superhot well, and it failed at the well-construction step that most of the eight ARPA-E projects are aimed at.

2018–present

Utah FORGE underground laboratory (2018–present)

The Department of Energy chose a site near Milford, Utah, for its Frontier Observatory for Research in Geothermal Energy, a purpose-built underground lab where teams test drilling and reservoir stimulation methods under controlled conditions.

Then

FORGE gave U.S. researchers a shared field site, replacing one-off experiments with repeatable tests.

Now

It set the template ARPA-E is now copying at a higher temperature: fund shared testing infrastructure alongside individual well designs.

Why this matters now

FORGE reservoirs sit well below 375 °C. SUPERHOT is the next temperature step, and one of its eight awards funds a lab-scale simulator in the same testing-infrastructure mold.