Energytech Nexus has named its first COPILOT accelerator cohort. Photo via Getty Images.

Energytech Nexus, a Houston-based hub for energy startups, has named its inaugural cohort of 14 companies for the new COPILOT accelerator.

COPILOT partners with Browning the Green Space, a nonprofit that promotes diversity, equity and inclusion (DEI) in the clean energy and climatech sectors. The Wells Fargo Innovation Incubator (IN²) at the National Renewable Energy Laboratory backs the COPILOT accelerator.

The eight-month COPILOT program offers mentorship, training and networking for startups. Program participants will be tasked with developing pilot projects for their innovations.

Two Houston startups are members of the first COPILOT class:

  • GeoFuels, housed at Houston’s Greentown Labs, has come up with a novel approach to hydrogen production that relies on geothermal power and methane decomposition.
  • PolyQor, which converts plastic waste into eco-friendly construction materials. Its flagship EcoGrete product is an additive for concrete that enhances its properties while reducing carbon emissions. PolyQor’s headquarters is at Houston’s Greentown Labs.

Other members of the COPILOT cohort are:

  • Birmingham, Alabama-based Accelerate Wind, developer of a wind turbine for commercial buildings.
  • Ann Arbor, Michigan-based Aquora Biosystems, which specializes in organic waste biorefineries.
  • Phoenix-based EarthEn Energy, a developer of technology for thermo-mechanical energy storage.
  • New York City-based Electromaim, which installs small hydro-generators in buildings’ water systems.
  • Chandler, Arizona-based EnKoat, an advanced materials company whose flagship product, the IntelliKoat System, is a patented two-layer thermal and weather barrier roof coating for flat and low-slope commercial buildings.
  • Calgary, Canada-based Harber Coatings, which manufactures electroless nickel coating and electroless nickel plating.
  • Dallas-based Janta Power, which designs and makes 3D solar towers.
  • Miami-based NanoSieve, a developer of gas remediation technology.
  • Palo Alto, California-based Popper Power, which has developed a platform that turns streetlight networks into resilient, maintenance-free distributed charging infrastructure.
  • Buffalo, New York-based Siva Powers America, developer of small wind turbines for farms, utility companies and others with annual energy needs of 300,000 to 2 million kilowatt-hours.
  • Los Angeles-based Thermoshade, which specializes in cooling panels for outdoor environments.
  • Waukesha, Wisconsin-based V-Glass, Inc., developer of a vacuum-insulated glass for affordable high-efficiency windows.

“These startups reflect the future of energy access and resilience innovation,” said Juliana Garaizar, founding partner of Energytech Nexus. “By connecting them directly with partners through

COPILOT, we’re helping them overcome the ‘pilot gap’ to build solutions that scale.”

The startups will run pilot projects along the Gulf Coast for their inventions.

Manas Pathak's insights offer a glimpse into the future of energy storage and the innovations that companies like Earthen are bringing to the table. Photo via earthen.energy

Q&A: The breakthrough energy tech that could replace batteries forever

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In the rapidly evolving world of energy technology, few innovations hold as much promise as the solutions being developed by Earthen.

We recently had the opportunity to sit down with Manas Pathak, the CEO and co-founder of Earthen, to delve into the company's groundbreaking thermo-mechanical energy storage system. In this Q&A, we explore the core of Earthen's technology, its potential impact on the energy sector, and what the future holds.

Manas Pathak's insights offer a glimpse into the future of energy storage and the innovations that companies like Earthen are bringing to the table. As the energy sector continues to evolve, solutions like these will play a pivotal role in shaping a sustainable future.

Energy Tech Startups: Can you explain the unique approach Earthen takes with its thermo-mechanical energy storage using supercritical CO2?

Manas Pathak: Certainly. At Earthen, we've developed a thermo-mechanical energy storage solution that leverages supercritical CO2. This phase of CO2, achieved at high pressures and temperatures, behaves both as a liquid and a gas. It's central to our technology, offering a compact, safe, and cost-effective solution for long-duration energy storage. Think of it as a modern take on compressed air storage but using CO2 for superior results.

Q: With so many energy storage solutions emerging, what sets Earthen's system apart in terms of efficiency?

MP: Our system boasts a competitive round-trip efficiency of 78%, which is quite remarkable. To put it in perspective, this efficiency rivals that of lithium-ion batteries. The use of supercritical CO2 is central to achieving this efficiency, allowing us to harness its unique properties for optimal energy storage and retrieval.

Q: How does Earthen's technology integrate with existing infrastructure, like pipelines?

MP: One of the exciting applications of our technology is its ability to retrofit pipelines, converting them into energy storage assets. This means that existing infrastructure, like pipelines initially designed for other purposes, can be repurposed and utilized for energy storage, maximizing the use of resources and reducing the need for new constructions.

Q: What are Earthen's plans for the future, especially in terms of product launches and market presence?

MP: We're quite ambitious about our roadmap. We aim to launch our first commercial product by 2026-2027. As for our market strategy, we're targeting a diverse range of customer segments, from utility-scale energy storage to commercial-industrial spaces. Our mission is to democratize access to clean energy on a global scale, and we're taking concrete steps to realize that vision.

Q: Lastly, what inspired the creation of Earthen and its focus on equitable energy distribution?

MP: Growing up in India, I witnessed firsthand the disparities in energy consumption. The smallest homes often faced the longest power outages. This early realization highlighted the need for equitable energy distribution. At Earthen, our end goal is to see clean electrons reaching every corner of the globe, ensuring that everyone has access to reliable and sustainable energy.

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This conversation has been edited for brevity and clarity. Click here to listen to the full episode.

Hosted by Jason Ethier and Nada Ahmed, the Digital Wildcatters’ podcast, Energy Tech Startups, delves into Houston's pivotal role in the energy transition, spotlighting entrepreneurs and industry leaders shaping a low-carbon future. Digital Wildcatters is a Houston-based media platform and podcast network, which is home to the Energy Tech Startups podcast.

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Houston-based ENGIE to add new wind and solar projects to Texas grid

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Houston-based ENGIE North America Inc. has expanded its partnership with Los Angeles-based Ares Infrastructure Opportunities to add 730 megawatts of renewable energy projects to the ERCOT grid.

The new projects will include one wind and two solar projects in Texas.

“The continued growth of our relationship with Ares reflects the strength of ENGIE’s portfolio of assets and our track record of delivering, operating and financing growth in the U.S. despite challenging circumstances,” Dave Carroll, CEO and Chief Renewables Officer of ENGIE North America, said in a news release. “The addition of another 730 MW of generation to our existing relationship reflects the commitment both ENGIE and Ares have to meeting growing demand for power in the U.S. and our willingness to invest in meeting those needs.”

ENGIE has more than 11 gigawatts of renewable energy projects in operation or under construction in the U.S. and Canada, and 52.7 gigawatts worldwide. The company is targeting 95 gigawatts by 2030.

ENGIE launched three new community solar farms in Illinois since December, including the 2.5-megawatt Harmony community solar farm in Lena and the Knox 2A and Knox 2B projects in Galesburg.

The company's 600-megawatt Swenson Ranch Solar project near Abilene, Texas, is expected to go online in 2027 and will provide power for Meta, the parent company of social media platform Facebook. Late last year, ENGIE also signed a nine-year renewable energy supply agreement with AstraZeneca to support the pharmaceutical company’s manufacturing operations from its 114-megawatt Tyson Nick Solar Project in Lamar County, Texas.

Houston geothermal company raises $97M Series B

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Houston-based geothermal energy startup Sage Geosystems has closed its Series B fundraising round and plans to use the money to launch its first commercial next-generation geothermal power generation facility.

Ormat Technologies and Carbon Direct Capital co-led the $97 million round, according to a press release from Sage. Existing investors Exa, Nabors, alfa8, Arch Meredith, Abilene Partners, Cubit Capital and Ignis H2 Energy also participated, as well as new investors SiteGround Capital and The UC Berkeley Foundation’s Climate Solutions Fund.

The new geothermal power generation facility will be located at one of Ormat Technologies' existing power plants. The Nevada-based company has geothermal power projects in the U.S. and numerous other countries around the world. The facility will use Sage’s proprietary pressure geothermal technology, which extracts geothermal heat energy from hot dry rock, an abundant geothermal resource.

“Pressure geothermal is designed to be commercial, scalable and deployable almost anywhere,” Cindy Taff, CEO of Sage Geosystems, said in the news release. “This Series B allows us to prove that at commercial scale, reflecting strong conviction from partners who understand both the urgency of energy demand and the criticality of firm power.”

Sage reports that partnering with the Ormat facility will allow it to market and scale up its pressure geothermal technology at a faster rate.

“This investment builds on the strong foundation we’ve established through our commercial agreement and reinforces Ormat’s commitment to accelerating geothermal development,” Doron Blachar, CEO of Ormat Technologies, added in the release. “Sage’s technical expertise and innovative approach are well aligned with Ormat’s strategy to move faster from concept to commercialization. We’re pleased to take this natural next step in a partnership we believe strongly in.”

In 2024, Sage agreed to deliver up to 150 megawatts of new geothermal baseload power to Meta, the parent company of Facebook. At the time, the companies reported that the project's first phase would aim to be operating in 2027.

The company also raised a $17 million Series A, led by Chesapeake Energy Corp., in 2024.

Houston expert discusses the clean energy founder's paradox

Guest Column

Everyone tells you to move fast and break things. In clean energy, moving fast without structural integrity means breaking the only planet we’ve got. This is the founder's paradox: you are building a company in an industry where the stakes are existential, the timelines are glacial, and the capital requires patience.

The myth of the lone genius in a garage doesn’t really apply here. Clean energy startups aren’t just fighting competitors. They are fighting physics, policy, and decades of existing infrastructure. This isn’t an app. You’re building something physical that has to work in the real world. It has to be cheaper, more reliable, and clearly better than fossil fuels. Being “green” alone isn’t enough. Scale is what matters.

Your biggest risks aren’t competitors. They’re interconnection delays, permitting timelines, supply chain fragility, and whether your first customer is willing to underwrite something that hasn’t been done before.

That reality creates a brutal filter. Successful founders in this space need deep technical knowledge and the ability to execute. You need to understand engineering, navigate regulation, and think in terms of markets and risk. You’re not just selling a product. You’re selling a future where your solution becomes the obvious choice. That means connecting short-term financial returns with long-term system change.

The capital is there, but it’s smarter and more demanding. Investors today have PhDs in electrochemistry and grid dynamics. They’ve been burned by promises of miracle materials that never left the lab. They don't fund visions; they fund pathways to impact that can scale and make financial sense. Your roadmap must show not just a brilliant invention, but a clear, believable plan to drive costs down over time.

Capital in this sector isn’t impressed by ambition alone. It wants evidence that risk is being retired in the right order — even if that means slower growth early.

Here’s the upside. The difficulty of clean energy is also its strength. If you succeed, your advantage isn’t just in software or branding. It’s in hardware, supply chains, approvals, and years of hard work that others can’t easily copy. Your real competitors aren’t other startups. They’re inertia and the existing system. Winning here isn’t zero-sum. When one solution scales, it helps the entire market grow.

So, to the founder in the lab, or running field tests at a remote site: your pace will feel slow. The validation cycles are long. But you are building in the physical world. When you succeed, you don’t have an exit. You have a foundation. You don't just have customers; you have converts. And the product you ship doesn't just generate revenue; it creates a legacy.

If your timelines feel uncomfortable compared to software, that’s because you’re operating inside a system designed to resist change. And let’s not forget you are building actual physical products that interact with a complex world. Times are tough. Don’t give up. We need you.

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Nada Ahmed is the founding partner at Houston-based Energy Tech Nexus.