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Houston-based geothermal energy startup releases promising results of Texas pilot

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Houston startup Sage Geosystems released the results of its pilot at a Shell-drilled oil well in the Rio Grande Valley’s Starr County. Photo via sagegeosystems.com

As it seeks an additional $30 million in series A funding, Houston startup Sage Geosystems has released promising results from a test of its technology for underground storage of geothermal energy.

Sage says the pilot project, conducted at a Shell-drilled oil well in the Rio Grande Valley’s Starr County, showed the company’s long-term energy storage can compete on a cost basis with lithium-ion battery storage, hydropower storage, and natural gas-powered peaker plants. Peaker plants supply power during periods of peak energy demand.

Furthermore, Sage’s geothermal technology will provide more power capacity at half the cost of other advanced geothermal systems, the company says.

Sage’s storage system retrofits oil and gas wells with the company’s geothermal technology. But the company says its technology “can be deployed virtually anywhere.”

The system relies on mechanical storage instead of battery storage. In mechanical storage, heat, water, or air works in tandem with compressors, turbines, and other machinery. By contrast, battery storage depends on chemistry to get the job done.

“We have cracked the code to provide the perfect complement to renewable energy. … The opportunities for our energy storage to provide power are significant — from remote mining operations to data centers to solving energy poverty in remote locations,” former Shell executive Cindy Taff, CEO of Sage, says in a September 12 news release.

Sage says its storage capacity can be connected to existing power grids, or it can develop microgrids that harness stored energy.

An August 2023 article in The New York Times explained that Sage “is pursuing fracked wells that act as batteries. When there’s surplus electricity on the grid, water gets pumped into the well. In times of need, pressure and heat in the fractures pushes water back up, delivering energy.”

The pilot project, a joint venture between Sage and the Bureau of Economic Ecology at the University of Texas at Austin, was performed as part of a feasibility study financed by the Air Force. Now that the test results are in, Sage plans to build a prototype geothermal project at the Air Force’s Ellington Field Joint Reserve Base in Houston.

Sage says another feasibility study is underway in the Middle East in partnership with an unnamed oil and gas company.

Founded in 2020, Sage plans to raise another $30 million to accompany its previous series A funding.

The Virya climate fund and Houston-based drilling contractor Nabors Industries helped finance the pilot project in Starr County.

Last year, Sage announced it received an undisclosed amount of equity from Houston-based Ignis H2 Energy, a geothermal exploration and development company, and Dutch energy company Geolog International. Also last year, Sage said Nabors and Virya had teamed up for a $12 million investment in the startup.

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Houston-based Fervo Energy collects $255M in additional funding

cha-ching

A Houston company that's responding to rising energy demand by harnessing geothermal energy through its technology has again secured millions in funding. The deal brings Fervo's total funding secured this year to around $600 million.

Fervo Energy announced that it has raised $255 million in new funding and capital availability. The $135 million corporate equity round was led by Capricorn’s Technology Impact Fund II with participating investors including Breakthrough Energy Ventures, CalSTRS, Congruent Ventures, CPP Investments, DCVC, Devon Energy, Galvanize Climate Solutions, Liberty Mutual Investments, Mercuria, and Sabanci Climate Ventures.

The funding will go toward supporting Fervo's ongoing and future geothermal projects.

“The demand for 24/7 carbon-free energy is at an all-time high, and Fervo is one of the only companies building large projects that will come online before the end of the decade,” Fervo CEO and Co-Founder Tim Latimer says in a news release. “Investors recognize that Fervo’s ability to get to scale quickly is vital in an evolving market that is seeing unprecedented energy demand from AI and other sources.”

Additionally, Fervo secured a $120 million letter of credit and term loan facility from Mercuria, an independent energy and commodity group that previously invested in the company.

“In surveying power markets across the U.S. today, the need for next-generation geothermal is undeniable,” Brian Falik, group chief investment officer of Mercuria, adds. “We believe in Fervo not just because their EGS approach is cost-effective, commercially viable, and already being deployed at scale, but because they set ambitious targets and consistently deliver.”

In February, Fervo secured $244 million in a financing round led by Devon Energy, and in September, the company received a $100 million bridge loan for the first phase of its ongoing project in Utah. This project, known as Project Cape, represents a 100x growth opportunity for Fervo, as Latimer explained to InnovationMap earlier this year. As of now, Project Cape is fully permitted up to 2 GW and will begin generating electricity in 2026, per the company.

Other wins for Fervo this year include moving into its new headquarters in downtown Houston, securing a power purchase agreement with California, growing its partnership with Google, and being named amongst the year's top inventions by Time magazine.


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This article originally ran on InnovationMap.

Greentown raises funding, a new tree initiative in Houston, and more trending energy transition news

top stories

Editor's note: From DOE funding for underground power line research to Zeta Energy's big deal with, these are the top headlines that resonated with EnergyCapital readers on social media and daily newsletter this week.

Investors from Houston and Boston fuel Greentown with $4M commitment

A mix of public and private investors have funded Greentown Labs. Photo via GreentownLabs.com

Greentown Labs, a climatetech incubator with locations in the Houston and Boston areas, has announced it has received funding from a mix of investors.

The $4 million in funding came from both of the Houston and Massachusetts locations. Houston investors included Bobby Tudor, CEO of Artemis Energy Partners and chairman of the Houston Energy Transition Initiative; David Baldwin, co-founder of OpenMinds and TEX-E and partner at SCF Partners; and Rice University. Other investors included MassDevelopment and the City of Somerville.

“The challenges of the energy transition are immense, and the role played by technology incubators like Greentown Labs is essential,” Tudor says in a news release. “We believe this role, which is a partnership between academia, industry, philanthropists, entrepreneurs, and governments, is the best way to get to effective, scalable solutions in a time frame that the urgency of the challenge requires. We need all hands on deck, and this partnership between Massachusetts and Texas can be a role model for others.”Continue reading.

Houston launches Google-backed tool to address urban tree cover disparities

American Forests is aiming to assist with at least 100 cities to make progress on Tree Equity by 2030. Photo by Thomas Koenig/Big Pineapple Productions

The oldest national nonprofit conservation organization in the U.S American Forests has launched the Houston Tree Equity Score Analyzer, which was developed through local nonprofit Trees For Houston and local stakeholders from local government, environmental groups and the public health sector, and supported by Google’s philanthropic arm Google.org with a $450,000 grant.

To mark the launch, Trees For Houston and American Forest celebrated the partnership and worked to plant 50 trees at Shadydale Elementary in Northeast Houston on December 6.

“This marks a significant milestone for Houston's urban forestry efforts,” says Texas State Representative Senfronia Thompson at the December 6 event. “This effort goes beyond simply planting trees—it’s about creating the foundation for a greener, more inclusive future for our community. By uniting diverse resources and partners, including American Forests, Google.org and Trees For Houston, we’re showcasing a powerful dedication to enhancing the environmental well-being and quality of life in our urban areas.”Continue reading.

Houston company secures $10M contract to deliver subsea well decommissioning solution

Expro has secured a $10 million contract to provide a subsea well decommissioning solution, combining subsea safety systems and surface fluid management to support safe re-entry and fluid management for plugged and abandoned wells. Photo courtesy of Expro

Houston energy services provider Expro was awarded a contract valued at over $10 million for the provision of a well decommissioning solution.

The solution will combine subsea safety systems and surface processing design that can enable safe entry to the well and management of well fluids.

“The contract reinforces our reputation as the leading provider of subsea safety systems and surface well test equipment, including within the P&A sector,” Iain Farley, Expro’s regional vice president for Europe and Sub-Saharan Africa, says in a news release.Continue reading.

This Houston innovator's innovative corrosion detection tech is vital to the future of energy

Anwar Sadek of Corrolytics joins the Houston Innovators Podcast to discuss his company's growth and move to Houston. Photo courtesy

Houston-based Corrolytics approach is to help revolutionize and digitize microbial corrosion detection — both to improves efficiency and operational cost for industrial companies, but also to move the needle on a cleaner future for the energy industry.

"We are having an energy transition — that is a given. As we are bringing new energy, there will be growth of infrastructure to them. Every single path for the energy transition, corrosion will play a primary role as well," Anwar Sadek, co-founder and CEO of Corrolytics, says on the Houston Innovators Podcast.

The technology Sadek and his team have created is a tool to detect microbial corrosion — a major problem for industrial businesses, especially within the energy sector. Sadek describes the product as being similar to a testing hit a patient would use at home or in a clinic setting to decipher their current ailments.Continue reading.


Houston company's $2B carbon-negative fuel project to rise in Southeast Texas

Pathway Energy has announced a major sustainable aviation fuel project in Port Arthur, Texas. Rendering courtesy of Pathway Energy

Houston developer of ultra carbon-negative fuels projects Pathway Energy announced a series of commercial-scale sustainable aviation fuel (SAF) facilities with the first being based in Port Arthur, Texas.

The project, estimated to be valued at $2 billion, will be one of the largest decarbonization projects in the world.

Pathway plans to bring commercial SAF to market with its years of experience in waste and biomass conversion processes and technologies that include biomass gasification, Fischer-Tropsch, biomass power generation, and complex biorefinery and industrial processes. Continue reading.

ExxonMobil, Worley to bring low-carbon hydrogen project to Baytown

big deal

ExxonMobil selected Australia-based engineering and professional services company Worley to provide engineering, procurement and construction services for a proposed hydrogen and ammonia production facility in Baytown, which is expected to have a production capacity of 1 billion cubic feet of blue hydrogen per day. ExxonMobil expects the facility will be the largest of its kind in the world.

“We are delighted to continue our strategic, global relationship with ExxonMobil in its execution of upcoming projects, particularly in delivering this EPC project on the US Gulf Coast, which contributes significantly to strengthening Worley’s backlog,” Chris Ashton, CEO of Worley, states, according to Offshore Energy.

The facility in Baytown is expected to produce 28.3 million cubic meters (1 billion cubic feet) of low-carbon hydrogen daily and nearly 1 million metric tonnes (more than 1 million tons) of ammonia per year, which will also capture more than 98 percent of the associated CO2 emissions.

The facility will leverage advanced carbon capture and storage technologies to reduce emissions associated with hydrogen production. ExxonMobile also said its carbon capture and storage system would be available for use by third-party CO2 emitters in the area.

A final investment decision is expected in 2025 , and an anticipated startup in 2029. “Blue” hydrogen is expected to be a top energy driver in 2025 according to global consultancy Wood Mackenzie who predicts that at least three large-scale blue hydrogen projects in the U.S will reach FID by next year.

The company hopes the new facility will help in creating U.S. jobs and supporting community development initiatives throughout the Houston area, and the state.

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