A rendering of a Quaise Energy geothermal plant. Rendering via quaise.com

Houston-based Quaise Energy, a producer of utility-scale geothermal power, raised $134 million in a Series B round to advance its “superhot” geothermal power plant.

Climate-focused San Francisco-based investment firm Prelude Ventures led the round, with participation from JERA Co., Japan’s largest power generation company, and Idemitsu Kosan, one of Japan’s largest energy companies. Nearly all existing investors, including cleantech-focused investment firm Safar Partners, participated in the round.

“We have backed Quaise since the beginning because we believed accessing superhot rock would unlock geothermal energy at a scale the world has never seen,” Mark Cupta, managing director at Prelude Ventures, said in a press release.

The startup expects more equity and debt deals to close “imminently.” Quaise has raised $230 million since its founding in 2018.

Quaise says some of the fresh funding will go toward building the world’s first commercial-scale “superhot” geothermal power plant —Project Obsidian in central Oregon. In addition, Quaise is earmarking money for continued development and commercialization of its millimeter-wave drilling system toward depths exceeding 5 kilometers (about 16,400 feet).

Quaise uses a millimeter-wave drilling system developed at the Massachusetts Institute of Technology to remove rock at depths and temperatures that aren’t economically feasible with conventional drilling. With this technology, Quaise can reach rock at temperatures of around 570 degrees to 930 degrees in most places worldwide, enabling construction of geothermal systems that rival fossil fuels and nuclear energy in power density and that rival renewables in cost.

“Our ambition is to power civilization with Earth's most compelling energy source. This round takes us from field-proven technology to first commercial revenues,” Carlos Araque, co-founder, president and CEO of Quaise, added in the release.

Quaise has demonstrated the capability of its millimeter-wave drilling system at its Central Texas test site, drilling more than about 330 feet through granite in 2025—the first time the technology penetrated basement rock at full scale in the field. The company is approaching a depth of about 3,300 feet at the same site.

Construction of Project Obsidian is underway at Oregon’s Deschutes National Forest. The project, which has the potential to generate gigawatt-scale power, is slated to deliver electricity to the Pacific Northwest grid by 2030.

Branch Energy aims to provide customers with clean energy at a lower cost than competitors. Photo via Getty Images

Houston clean energy provider raises $10.8M series A

money moves

A tech-driven retail energy provider based in Houston has secured an oversubscribed series A round of funding.

Branch Energy raised a $10.8 million round led by climate-focused venture capital firm Prelude Ventures with co-investor Zero Infinity Partners, an infrastructure tech-focused firm. The fresh funding will go toward accelerating the company's battery management tech and build out the infrastructure of its field services.

A vertically integrated power provider, Branch Energy aims to provide customers with demand management software and battery storage systems to ensure long-term, stable, and clean energy at a lower cost than competitors.

“Our century-old grid design is not equipped for the complexity of today’s energy needs," Alex Ince-Cushman, Branch Energy co-founder and CEO, says in a news release. “Optimizing distributed energy assets in real-time will play an increasingly important role in managing the grid. We built Branch from the ground up as a technology company, allowing us to deliver value to customers in this new era of distributed energy by reducing costs while improving reliability."

The company chose Texas as its inaugural market based on the stress of the grid in the state, the company says in the release. Since 2021 when Branch Energy launched, it has signed up thousands of customers for its 100 percent clean energy service. The business proposition includes lowering customer's energy bills by 5 to 10 percent.

“The power grid, especially in Texas, requires distributed generation and flexible loads as basic economics drives deployment of more renewable resources,” Tim Woodward, managing partner at Prelude Ventures, adds. “Across the country, we are experiencing a major shift toward a decentralized and decarbonized grid. Branch Energy is bringing value to its customers through deployment of intelligent storage that lowers costs and improves reliability.”

Branch Energy, which is available now in some Texas regions, had previously raised $5.5 million in seed and pre-seed funding, per Crunchbase.

Things are heating up in Utah for Fervo Energy. Photo via fervoenergy.com

Houston company breaks ground on 'world's largest' geothermal project with next-generation tech

coming soon

Houston-based cleantech startup Fervo Energy has broken ground on what it's describing as the "world’s largest next-gen geothermal project."

Fervo says the a 400-milliwatt geothermal energy project in Cape Station, Utah, will start delivering carbon-free power to the grid in 2026, with full-scale production beginning in 2028.

The project, in southwest Utah, is about 240 miles southwest of Salt Lake City and about 240 miles northeast of Las Vegas. Cape Station is adjacent to the U.S. Department of Energy’s Frontier Observatory for Research in Geothermal Energy (FORGE) and near the Blundell geothermal power plant.

The company says Cape Station will generate about 6,600 construction jobs and 160 full-time jobs.

“Beaver County, Utah, is the perfect place to deploy our next-generation geothermal technology,” Tim Latimer, co-founder and CEO of Fervo, says in a news release. “The warmth and hospitality we have experienced from the communities of Milford and Beaver have allowed us to embark on a clean energy journey none of us could have imagined just a few years ago.”

In February, the U.S. Bureau of Land Management gave its blessing to the project, allowing Fervo to undertake exploration activities at the site.

“Geothermal innovations like those pioneered by Fervo will play a critical role in extending Utah’s energy leadership for generations to come,” says Utah Gov. Spencer Cox, who attended the groundbreaking ceremony.

Since being founded in 2017, Fervo has raised more than $180 million in funding. Its highest-profile investors are billionaires Jeff Bezos, Richard Branson and Bill Gates. They’re backing Fervo through Breakthrough Energy Ventures, whose managing director sits on Fervo’s board of directors.

Other investors include the Canada Pension Plan Investment Board (CPP Investments), DCVC, Devon Energy, Liberty Energy, Helmerich & Payne, Macquarie, the Grantham Foundation for the Protection of the Environment, Impact Science Ventures, and Prelude Ventures.

Fervo aims to generate more than one gigawatt of geothermal energy by 2030. On average, one gigawatt of power can provide electricity for 750,000 homes. Two coal-fired power plants can generate roughly the same amount of electricity.

Earlier this year, Fervo announced results of a test at Nevada’s Project Red site, which will supply power to Google data centers in the Las Vegas area. Fervo says the 30-day well test established Project Red as the “most productive enhanced geothermal system in history,” the company says. The test generated 3.5 megawatts of electricity.

In 2021, Fervo and Google signed the world’s first corporate agreement to produce geothermal power. Under the deal, Fervo will generate five megawatts of geothermal energy for Google through the Nevada project, which is set to go online later this year.

What is it going to take to make Houston a leader in the energy transition? Access to capital, according to a panel from Venture Houston. Photo by Natalie Harms/EnergyCapital

Experts: Houston needs to unlock early-stage capital to lead the energy transition

show me the money

Last week, Tim Latimer sat on a panel that consisted mostly of his company's investors and discussed what he felt the missing piece still was for Houston's energy transition and innovation community.

“There’s no better place in the world than Houston to build and scale a climate tech startup," he says on a Venture Houston panel titled Seeding Sustainability: Unlocking the Power of Early Stage Investments.

“But I don’t know if I’m ready to make the claim that we’re the best place to start a business,” he adds.

Latimer, who co-founded Fervo Energy in the Bay Area in 2017 before relocating the company to Houston, explains that his company raised capital on the West Coast ahead of moving to Texas to grow and scale. This allowed the company, which recently announced the success of a major pilot, to tap into early stage funding and then make the most of every dollar raised by moving to a region where the money would last longer — and where there's talent, customers, and more.

“The dream for us to have a truly unlocked ecosystem is that the whole pattern can happen here in Houston, and the gap I see is that capital formation side,” he says.

Latimer was joined on the panel by some of Fervo's investors: Mark Cupta, managing partner of Prelude Ventures; Andrea Course, venture principal of Shell Ventures; and Joshua Posamentier, co-founder and managing partner of Congruent Ventures.

Each of the panelists weighed in on what it would take for Houston to emerge as a leader within the global energy transition. Cupta says that it's going to take the city time to build out activity, successful outcomes, talent, money, and more.

“The venture capital community is an ecosystem, and that ecosystem consists of multiple stakeholders that all have to work in concert with each other," he says. "It has to be a flywheel that spins up over time.”

Course, the only Houston-based investor on the panel, says that Houston has potential because it's got talent, industry, and money, or TIM, as she describes.

“I think Houston is actually the perfect place for becoming the energy transition capital. If you ask me, I think we already are.” Course explains. “It really just takes people doing what we’re doing now to make it even greater."

Posamentier, who previously shared his outlook on Houston in a Q&A with EnergyCapital, explains that access to funding isn't the only issue. “There’s a lot more money than there are investable opportunities at the moment,” he says.

The panel also weighed in on the difference between venture capital and funding coming out of corporations.

“VCs and CVCs have different timelines,” Course explains, saying VC firms have 5- to 7-year life cycles. After that, they need to see an exit to be able to provide that return. “With a CVC, we don’t really have that. Of course we want to show financial returns, but we are long-duration capital.

CVC is patient capital with value-add investors, but Course admits there's a longer due diligence because she wants to find a strategic stakeholder before an investment is made.

“The worst thing that could happen is that Shell gives you money, but they don’t give you business. We don’t want that,” she says.

Waiting for that right investor can be extremely important to company success, Latimer says from the founder perspective.

“It’s hard to put a hard dollar value on help, but our ability to have advisers and introductions from different types of investors … makes all the difference in the world,” he says on the panel. “A lot of startup founders think about their org design very critically and who they want to bring onto the team, and you should be deliberate on your cap table.”

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Houston startup wins Space Force contract to advance quantum energy generator

quantum contract

Houston-based quantum energy technology startup Casimir Inc. has been awarded an STTR Phase I contract from the U.S. Space Force's SpaceWERX to support the development of the company's solid-state generator for potential use by the Department of the Air Force.

SpaceWERX is the innovation arm of the U.S. Space Force and a division within AFWERX, the incubator and innovation arm of the United States Department of the Air Force. The Air Force Research Laboratory and SpaceWERX, along with many other government agencies, help support innovation through the Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) grants and contracts.

As part of the new contract, Casimir will work to refine a fully independent generator. Casimir’s solid-state power technology could support national security missions by providing reliable power even in difficult-to-service environments.

In May, Casimir emerged from stealth, netting a $12 million seed round to commercialize its quantum energy chip. The semiconductor chips can generate power from quantum vacuum fields without the need for batteries or charging. The company aims to include the chips in large-scale energy systems that can power homes, commercial infrastructure and electric vehicles.

“This STTR funds some analysis work to address our proposed scaling approach of making our chips multi-layer to increase aggregate power,” Harold “Sonny” White, founder and CEO of Casimir, tells Energy Capital.

White adds that the company will work with Texas A&M to develop chip planarization techniques to support Casimir’s plans to scale. Additionally, White says the company is working with the U.S. Space Force to explore more applications for its technology.

“Casimir’s technology brings a new capability to the market in the form of our persistent power chips,” White adds. “This approach will be relevant to ultra-low-power electronics, and with the scaling approach we are developing, connected with the STTR work, will eventually be relevant to consumer electronics and beyond.”

Casimir has previously reported that it plans to commercialize its first-generation MicroSparc chip by 2028. The chips are expected to power devices for years without the need for replacements.

The total funding for this project has not yet been disclosed.

Houston clean energy tax compliance platform tops the Inc. 5000 in 2026

Top of the List

Houston-based Empact Technologies has ridden the clean energy wave to the Inc. 5000’s 30 fastest-growing private companies.

With three-year revenue growth of 8,275 percent, the clean energy tax credit compliance management platform appears at No. 27 on this year’s Inc. 5000 list. The 2026 list ranks private companies based on percentage revenue growth from 2022 to 2025.

Empact Technologies, also ranks as the No. 2 fastest-growing company in Houston and the No. 4 fastest-growing company in Texas.

Originally founded by Charles Dauber in 2012, Empact Technologies relaunched in 2023 as a purpose-built tool for clean energy tax credit compliance, following the creation of the Inflation Reduction Act, the largest clean energy investment incentive in U.S. history.

It provides a platform for clean energy developers, investors, and contractors, and combines its NexusIQ AI-native compliance platform with a dedicated team of technical and regulatory experts to ensure ongoing compliance and documentation.

Empact Technologies is joined by six other Houston-area companies in the top 250 of this year's Inc. 5000, including one that made the top 10.

Here are the six other Houston-area companies that claimed spots in the top 250 on the Inc. 5000 list. Each company name is followed by its ranking, headquarters city, and three-year growth rate.

  • No. 6 Equipe Realty, 23,210 percent
  • No. 60 Action1, 4,512 percent
  • No 75 Signs By G, 3,684 percent
  • No. 79 The ’Pause Life, 3,469 percent (Galveston)
  • No. 110 Turtlebox Audio, 2,576 percent
  • No. 178 Dahnani Private Equity Group, 1,904 percent (Stafford)
Empact and fellow honorees will be recognized Oct. 14-16 at the 2026 Inc. 5000 Conference & Gala in Dallas.

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A version of this article first appeared on InnovationMap.com.

Sage Geosystems brings South Texas geothermal plant online

powering up

Houston-based Sage Geosystems, a provider of geothermal power, has begun full operations at its South Texas facility for the San Miguel Electric Cooperative.

Sage says the plant was recently “placed in service,” according to a news release. This means it’s fully built and tested, and ready to generate and supply electricity to the grid.

Since selling its first electricity in Q2 of this year, the facility has been operating for more than four months to evaluate aspects like efficiency and water management. Sage relied on its GeoTwin modeling tool to carry out some of the testing.

The testing demonstrates Sage’s proprietary approach to geothermal power “overcomes one of the industry’s most persistent challenges, high water losses in engineered reservoirs, while delivering the consistent performance required to scale next-generation geothermal,” co-founder and CEO Cindy Taff said in the release.

Sage says the South Texas facility will serve as a model for future projects, including one in Nevada. The Nevada facility will use Sage’s proprietary technology to extract geothermal heat from hot dry rock, creating a reliable, affordable source of carbon-free power.

During the testing period, water losses amounted to less than 10 percent. This low rate indicates most water remains in the system, enabling Sage to capture more usable energy, boost power production and improve the project’s finances, the company says.

“Commercial geothermal isn’t just about creating a reservoir. It’s about creating one whose performance can be engineered, predicted, and consistent,” Lev Ring, the company’s co-founder, president and chief technology officer, said in the release.

Since being founded in 2020, Sage has raised $159 million in outside funding. This includes a more than $97 million Series B round co-led by Ormat Technologies and Carbon Direct Capital.

Two years ago, Sage announced a deal with Meta Platforms, the parent company of Facebook and Instagram, to supply up to 150 megawatts of geothermal power to Meta data centers.