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Q&A

Geothermal exec on Houston expansion, commercialization and more

Laura Furr Mericas
Jan 24, 2025, 10:15 am
Axel-Pierre Bois, XGS Energy's Chief Technology Officer. Photo courtesy XGS Energy

Challenges in the energy transition often center around two questions: Where will organizations find the resources? And how will projects be financed?

XGS Energy's next-gen closed-loop geothermal well architecture addresses both issues head-on. The California-based company saw massive growth in the Houston market last year and recently completed a 100-meter field demonstration in central Texas, marking a major milestone for its technology's commercialization and potential for scale.

In an interview with EnergyCapital, Axel-Pierre Bois, XGS's Chief Technology Officer, shares what drew him to the geothermal space, why XGS is expanding in Houston and what the company's plans are for the year ahead.

How does XGS Energy's technology address the biggest challenges in geothermal energy?

XGS Energy is developing a geothermal system that decouples geothermal energy from its traditional dependence on water and geology to deliver affordable, clean energy anywhere there is hot rock.

Historically, geothermal resources have been hard to locate, as conventional systems require the overlap of hot rock, porous and permeable geology, and abundant water to produce energy, limiting their potential to a few select hot spots worldwide. Instead of relying on an underground fracture network that drives the geology and water requirements, the base component of XGS’s system is a single well, in which fluid is pumped to a hot rock resource and then returned to the surface through a tube-in-shell design, creating a sealed, closed loop. This allows XGS to produce geothermal energy anywhere where there is hot rock, unlocking terawatt-scale potential in the U.S. alone.

Geothermal systems have also struggled to secure project financing, as many systems have historically faced high levels of unplanned cost risk due to factors including water loss and production uncertainty. XGS’s sealed, closed-loop system ensures that it can provide reliable, predictable electricity throughout its lifespan. XGS also boosts the cost-competitiveness of its system through our major innovation, a proprietary thermally conductive materials system that is installed downhole around each well, increasing the heat transferred to the closed-loop system by 30-50%.

What has drawn you to a career in the geothermal energy space?

I have been in the subsurface industry for over 30 years, developing technical solutions for companies in the fields of geosciences, underground storage, upstream oil and gas, and geothermal heat harvesting to help improve their overall economic, ethical and environmental footprints. In 2009, I founded Curistec, a technology company providing research, engineering and technical services for geomechanics, wellbore integrity, well abandonment, cement design and cement and rock testing. A few years back, Curistec assisted with the Iceland Deep Drilling Project, helping to develop cement formulations for superhot geothermal well applications to enable drilling in high-temperature environments. As I looked toward the future, it became clear that next-generation geothermal technologies would transform the geothermal energy industry and open new markets worldwide. Curistec had been working closely with the XGS Energy team as technology partners for several years, so joining the team directly to help shape the technology development was an exciting opportunity to help develop and deploy a new system to unlock the full terawatt-scale potential of geothermal energy.

Tell us about the 100-meter field demonstration in central Texas completed in 2024 — what all did you and your team learn from the test?

Our 100-meter field demonstration in central Texas marked a significant step in our progress toward deploying geothermal energy in a commercial setting. With this field operation, we successfully demonstrated our ability to mix, pump and place our thermally conductive materials system at a commercial scale, using off-shelf tools and technologies. This was a significant milestone, taking us from theoretical models and laboratory tests to field-scale operations, proving that our novel geothermal system is operationally viable in real-world well conditions.

The completion of the Texas field demonstration advanced XGS into the new wave of geothermal innovators that are putting real steel in the ground. In 2024, we kicked off construction at our commercial-scale demonstration in California and are excited to share updates in the year ahead.

Last year, XGS Energy leased over 10,000 square feet of office space in Memorial City. How has Houston's business community and opportunities benefitted the company?

Houston, the epicenter of the oil and gas industry, has become a hub of energy innovation, offering attractive incentives for growing companies like XGS. The region’s workforce, which is home to some of the best subsurface engineers and operational talent in the energy sector, was a key factor for XGS when we were planning our operational roadmap. This expertise, paired with proximity to our partners in the field services industries, like cementing and drilling, is both apracticaland tactical advantage for XGS.

We’ve built a strong technical and operational team here at XGS, with experience from the oil and gas industry, utilities and power project developers. XGS is planning for continued growth in the Houston area, leveraging the region’s leading engineering and operational workforce and its intensifying interest in supporting the energy transition.

What are XGS Energy's goals for 2025?

In 2024, the XGS Energy team made significant progress toward our goal of providing clean, round-the-clock energy with our solid-state geothermal system. In 2025, XGS Energy will be focused on deploying its geothermal system at a commercial scale, starting with the completion of our full-scale prototype in California. XGS will also continue accelerating our commercial traction, expanding our already robust and highly differentiated geothermal resource evaluation toolkit, advancing our global project pipeline, and growing our team to strengthen our operational capability and capacity.

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Environmentalists say Trump's energy order would subvert Endangered Species Act

Trump's order tells federal departments to treat energy production as an emergency, which could help expedite approval of energy projects that might otherwise be held up. Getty Images

Environmental groups concerned about loss of protections for vanishing animals see one of President Donald Trump’s early executive orders as a method of subverting the Endangered Species Act in the name of fossil fuel extraction and corporate interests.

Trump declared an energy emergency via executive order earlier this week amid a promise to “drill, baby, drill.” One section of the order states that the long-standing Endangered Species Act can’t be allowed to serve as an obstacle to energy development.

That language is a pathway to rolling back protections for everything from tiny birds like the golden-cheeked warbler to enormous marine mammals like the North Atlantic right whale, conservation groups said Wednesday. Some vowed to fight the order in court.

The Endangered Species Act has been a hurdle for the development of fossil fuels in the U.S. for decades, and weakening the act would accelerate the decline and potential extinction of numerous endangered species, including whales and sea turtles, said Gib Brogan, a campaign director with conservation group Oceana.

“This executive order, in a lot of ways, is a gift to the oil and gas industry and is being sold as a way to respond to the emergency declaration by President Trump,” Brogan said. “There is no emergency. The species continue to suffer. And this executive order will only accelerate the decline of endangered species in the United States.”

The Endangered Species Act has existed for more than 50 years and is widely credited by scientists and environmentalists with helping save iconic American species such as the bald eagle from extinction. A key section of the act directs federal agencies to work to conserve endangered and threatened species and use their authorities to protect them.

Trump's order declaring a national energy emergency took direct aim at the authority provided by the Endangered Species Act. It orders federal departments to treat energy production as an emergency, which could help expedite approval of energy projects that might otherwise be held up.

The order also convenes a committee to “identify obstacles to domestic energy infrastructure specifically deriving from implementation of the ESA or the Marine Mammal Protection Act,” another landmark conservation law. It states the committee could consider regulatory reforms, including “species listings,” as part of its work.

The Trump administration did not respond to a request for comment on the executive order. The order defines energy mostly as fossil fuels such as crude oil and and coal and does not include renewable energies such as wind power. It also states that energy production is an emergency because “an affordable and reliable domestic supply of energy is a fundamental requirement for the national and economic security of any nation.”

While environmentalists herald the Endangered Species Act as a landmark law, pro-development and free market interests have long criticized it for holding up the building of energy, infrastructure, housing and other projects. Some, including the influential Heartland Institute, applauded Trump's declaration of an energy emergency this week.

Conservatives have also decried the Endangered Species Act as inefficient. It took the U.S. Fish and Wildlife Service years to follow the process of potentially delisting the golden-cheeked warbler, a small songbird that breeds only in the forests of central Texas, said Connor Mighell, an attorney with Texas Public Policy Foundation, a free market research institute.

Trump's executive order could help stop the Endangered Species Act from resulting in drawn-out permitting processes and lengthy litigation, said Brent Bennett, energy policy director for Texas Public Policy Foundation.

“We're hoping that can improve some of the permitting processes and remove some of these barriers,” Bennett said.

But the act is critical to maintaining species threatened with extinction, environmentalists said. They cite whales such as the North Atlantic right whale, which numbers less than 400 and is vulnerable to collisions with ships and entanglement in fishing gear, as an example of an animal that must be protected under the act. The Rice's whale, which numbers even fewer and is vulnerable to disruption from oil drilling in the Gulf of Mexico, is another prime example, environmentalists said.

The nation's symbol, the bald eagle, is a perfect example of the importance and effectiveness of the Endangered Species Act, said Andrew Bowman, president of the conservation group Defenders of Wildlife.

“President Trump’s election to office did not come with a mandate to deny Americans a clean and healthy environment or destroy decades of conservation successes that have ensured the survival and recovery of some of America’s most iconic species, including the bald eagle, which was newly named our country’s national bird and is only with us today thanks to the Endangered Species Act," Bowman said.

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