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Houston hub for clean energy startups names global founding partners

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EnergyTech Nexus has named 19 companies as Global Founding Partners. Photo via Unsplash.

EnergyTech Nexus, a Houston-based hub for clean energy startups, announced its coalition of Global Founding Partners last month at its Pilotathon event during Houston Energy and Climate Week.

The group of international companies will contribute financial and technical resources, as well as share their expertise with startup founders, according to a news release from EnergyTech Nexus.

“Our Global Founding Partners represent the highest standards of industrial leadership, technical expertise and commitment to innovation,” Juliana Garaizar, co-founding partner of EnergyTech Nexus, added in the release. “Their collaboration enables us to connect groundbreaking technologies with the resources, infrastructure, and markets needed to achieve global scale.”

Houston-based partners include:

  • Cemvita Inc.
  • Chevron Technology Ventures
  • Collide
  • Greentown Labs
  • Kauel
  • Oxy Technology Ventures
  • Revterra
  • Sunipro

“At Collide, we believe progress happens when the right people, data, and ideas come together. Partnering with EnergyTech Nexus allows us to support innovators with the insights and community they need to accelerate deployment at scale,” Collin McLelland, co-founder and CEO of Collide, a provider of generative artificial intelligence for the energy sector, said in the release.

"Revterra is thrilled to be a founding member of the EnergyTech Nexus community," Ben Jawdat, founder and CEO of kinetic battery technology company Revterra, added. "Building a strong network of collaborators, customers, and investors is critical for any startup — particularly when you're building novel hardware. The Energytech Nexus community has been incredible at bringing all of the right stakeholders together."

Other partners, many of which have a strong presence in Houston, include:

  • BBVA
  • EarthX
  • Endress+Hauser
  • Goodwin
  • Greenbackers Investment Capital
  • ISR Energy
  • Latham & Watkins LLP
  • Ormazabal
  • Repsol
  • STX Next
  • XGS Energy

Jason Ethier, co-founding partner of EnergyTech Nexus, said that partnerships with these companies will be "pivotal" in supporting the organization's community of founders and Houston's broader energy transition sector.

“The Energy and Climate industry deploys over $1.5 trillion in capital every year to meet our growing energy demands. Our global founding partners recognize that this energy must be delivered reliably, cost effectively, and sustainably, and have committed to ensuring that technology developed without our ecosystem can find a path to market through testing and piloting in real-world conditions," Ethier said. "The ecosystem they support here solidifies Houston as the global nexus for the energy transition.”

EnergyTech Nexus also recently announced a "strategic ecosystem partnership" with Greentown Labs, aimed at accelerating growth for clean energy startups. Read more here.

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Eight Houston energy leaders appear on the global startup index. Photo via Getty Images

8 Houston energy giants top global corporate startup index for 2025

Global Group

Eight major players in Houston’s energy industry rank among the world’s top 20 energy companies for corporate startup activity.

The inaugural Corporate Startup Activity Index 2025, published by StartupBlink, ranks global corporations by industry. The eight Houston-area employers fall into the index’s energy and environment category.

Researchers from StartupBlink, an innovation research platform, scored more than 370 companies based on three factors: corporate involvement in startup activity, startup success and ecosystem integration.

The eight Houston-area energy employers that landed in the energy and environment category’s top 20 are:

  • No. 3 BP. Score: 13.547. U.S. headquarters in Houston.
  • No. 5 Saudi Aramco. Score: 7.405. Americas headquarters in Houston.
  • No. 7 Eni. Score: 6.255. Headquarters of Eni U.S. Operating Co. in Houston.
  • No. 8 Shell. Score: 6.217. U.S. headquarters in Houston.
  • No. 11 Occidental Petroleum. Score: 5.347. Global headquarters in Houston.
  • No. 15 Engie. Score: 3.352. North American headquarters in Houston.
  • No. 17 Repsol. Score: 2.980. U.S. headquarters for oil and gas operations in The Woodlands.
  • No. 19 Chevron. Score: 2.017. Global headquarters in Houston.

“Building a startup is hard, and navigating corporate innovation can be just as complex. This ranking is a step toward making the connection between startups and corporations more transparent, enabling startups and corporations to collaborate more effectively for mutual success,” said Eli David Rokah, CEO of StartupBlink.

Salesforce topped the global index with a score of 380.090, followed by Intel, Google, Qualcomm, and Comcast.

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This article originally appeared on InnovationMap.com.

Caton Fenz, CEO for Repsol’s Renewables North America, shares more about Repsol’s approach to expanding its renewable footprint, integrating green energy into its core business and leveraging Houston’s unique role as a leader in the energy transition. Photo via HETI

25 years of innovation: Repsol exec on Houston's role in the energy transition

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Houston hosted the inaugural Energy + Climate Startup Week in September, which brought together leading energy and climate venture capital investors, industry leaders and startups from around the world to showcase the most innovative companies and technologies that are transforming the energy industry while driving a sustainable, low-carbon energy future.

Repsol was one of the inaugural sponsors for the weeks kick off event that hosted several leading startups. This year marked 25 years of energy innovation for Repsol in the United States. As the energy landscape evolves, Repsol has committed to significant growth in renewable capacity, with an impressive 720 MW of solar and storage capacity already operational and 1.5 GW under construction.

Caton Fenz, CEO for Repsol’s Renewables North America shares more about Repsol’s approach to expanding its renewable footprint, integrating green energy into its core business and leveraging Houston’s unique role as a leader in the energy transition. Here’s an inside look at Repsol’s milestones and future goals in the journey toward decarbonization and a sustainable energy future.

Can you tell us more about Repsol’s strategy for expanding its renewables business?

This year Repsol is celebrating 25 years of energy development in the United States. Across the US, we have a team of more than 800 employees, with more than 130 employees working in the renewables business specifically.

Repsol’s growth ambition in the US renewable energy market is significant. Since launching our renewables activity in the US three years ago, we have installed more than 720 MW of solar generation and energy storage capacity. Today we have more than 1.5 GW of additional solar and energy storage capacity under construction, and more than 20 GW of solar, wind and energy storage in development across 13 states.

How does Repsol plan to integrate renewable energy sources into its broader business model?

Repsol Renewables operates in accordance with Repsol’s values and strategies. Renewable energy generation is one of the pillars of Repsol’s decarbonization strategy. Repsol will invest between €3 and 4 billion to organically develop its global project portfolio and aims to reach between 9,000 MW and 10,000 MW of installed capacity by 2027. Of this, 30% will be in the United States.

With these objectives in mind, we have been able to accelerate the development of wind, solar, and energy storage across the US market and the globe. By expanding our renewable energy business, we can further meet record demand growth for renewable energy.

What are the key projects or milestones that have been achieved within Repsol’s renewables portfolio so far?

Earlier this year, we announced the commercial operation of Frye Solar, our largest solar project worldwide. This project, located in Swisher County, Texas, has a total capacity of 637 MW. And as noted above, we have an additional 1.4 GW of projects under construction currently. These major energy infrastructure projects are indicative of the scale of our operations in the US.

Why does Repsol believe being located in Houston is critical for its business, particularly in the energy transition?

Repsol is proudly committed to Houston’s role in developing and delivering energy and value for the world. Houston is known as the Energy Capital of the World and over the next 10 years, we’ll see it be known as the Energy Transition Capital of the World. With Repsol’s Renewables North America business located in downtown Houston, we have access to talent and partnerships in a booming city filled with energy experts.

Why does Repsol see value in participating in Houston Energy + Climate Startup Week?

At Houston Energy + Climate Startup Week, Repsol Renewables is honored to support and learn from leaders and investors in the energy and climate industry. We believe it is important to continuously invest in talent, ideas, and collaboration across the energy value chain as we pursue our net zero by 2050 goal.

———

This article originally ran on the Greater Houston Partnership's Houston Energy Transition Initiative blog. HETI exists to support Houston's future as an energy leader. For more information about the Houston Energy Transition Initiative, EnergyCapitalHTX's presenting sponsor, visit htxenergytransition.org.

Last month, the inaugural Houston Energy and Climate Startup Week 2024 successfully highlighted the GHP and HETI's mission. Photo via GHP

Highlights from the inaugural Houston Energy and Climate Startup Week

the view from heti

Houston has become the hub for startups and companies looking to scale innovative technologies that are transforming the energy industry and advancing a sustainable, low-carbon future. Last month, the inaugural Houston Energy and Climate Startup Week 2024 successfully highlighted this mission.

Rice Alliance for Technology and Entrepreneurship, Halliburton Labs, Greentown Labs, Digital Wildcatters launched the inaugural startup week in collaboration with the Partnership’s Houston Energy Transition Initiative. The week brought together leading energy and climate venture capital investors, industry leaders, and startups from around the world.

Over 30 events took place from September 9-13, featuring more than 100 speakers and 125 startups. Attendance numbers came in at over 1,400 people across the week’s anchor events, and additional events were individually organized by organizations and startups in Houston’s ecosystem.

“By hosting the Houston Energy & Climate Startup Week, we're not just showcasing our city's strengths - we're actively shaping its future. This event is a critical catalyst for fostering collaboration, investment and talent development within the burgeoning energy and climate tech ecosystem. This week is about demonstrating our commitment to that future and inspiring the next generation of energy innovators,” says Janice Tran, Kanin Energy CEO & Co-Founder

The Kickoff event, sponsored by Repsol, Microsoft and BBVA, hosted fireside chats by several of Houston’s leading startups, including Solugen, Cemvita, Kanin Energy and Syzygy.

“Houston is at the forefront of not just energy innovation, but industrial innovation more broadly. With the momentum that's built over the last few years, it's the perfect time to showcase our progress and drive further advancements in climate solutions,” says Gaurab Chakrabarti, Solugen CEO and co-founder.

Houston is home to more than 65 incubators and accelerators and over 260 cleantech and climate tech startups. The region continues to build momentum and is focused on attracting investment for this growing sector, seeing a 577 percent growth since 2019. According to Partnership data, there has been over $1.95 billion and 175 deals with cleantech and climate tech startups.

"Houston is uniquely positioned to tackle the greatest challenge of our time - producing more energy with fewer emissions. This city is where energy innovation scales and opportunity thrives. As a natural hub for startups and investors, Houston brought this to life during Houston Energy and Climate Startup Week. Years in the making, this event was launched to answer the question: Can the whole be greater than the sum of its parts? This past week proved it can. We look forward to continue building on this successful week,” says Jane Stricker, senior vice president at Greater Houston Partnership and executive director of the Houston Energy Transition Initiative.

———

This article originally ran on the Greater Houston Partnership's Houston Energy Transition Initiative blog. HETI exists to support Houston's future as an energy leader. For more information about the Houston Energy Transition Initiative, EnergyCapitalHTX's presenting sponsor, visit htxenergytransition.org.

Repsol announced that it's buying ConnectGen from Quantum Capital Group, a Houston-based private equity firm that focuses on energy investments. Photo via Getty Images

Repsol to acquire Houston-based renewable energy platform

M&A Move

Spanish energy giant Repsol is breaking into the U.S. market for onshore wind power with its $768 million deal to purchase Houston-based renewable energy startup ConnectGen.

Repsol is buying ConnectGen from Quantum Capital Group, a Houston-based private equity firm that focuses on energy investments, according to a September 8 news release. Quantum’s renewable energy arm, 547 Energy, owns ConnectGen.

ConnectGen, founded in 2018, operates 278 megawatts of solar energy projects in Arizona, California, and Nevada. Its nationwide development pipeline features more than 20,000 megawatts of wind power, solar power, and energy storage projects.

“All of us at Quantum and 547 Energy are looking forward to watching Repsol convert these development projects into operating assets that will help power the American economy with clean renewable electricity over the next decade,” says Wil VanLoh, founder, chairman, and CEO of Quantum.

Quantum and its affiliates have managed more than $22 billion in equity investments since the firm was founded in 1998.

Once the deal tentatively closes by the end of 2023, current ConnectGen employees, including senior executives, are expected to join Repsol’s renewable energy team. Caton Fenz has been CEO of ConnectGen since 2019. He previously was the startup’s chief development officer.

“The addition of ConnectGen accelerates our commitment to renewable generation in one of the markets with the greatest potential for future growth. In that sense, bringing on board its valuable team of experts is key to [ensuring] our successful future growth with robust profitability in the market,” says Josu Jon Imaz, CEO of Repsol.

Repsol has targeted 20,000 megawatts of installed global capacity for renewable energy by 2030. The company owns 245 megawatts of renewable energy assets in the U.S. and 2,000 megawatts worldwide.

ConnectGen’s capabilities build on Repsol’s 2021 purchase of a 40 percent stake in Chicago-based Hecate Energy, which develops solar power generation and energy storage projects.

Repsol aims to operate 2,000 megawatts of installed renewable energy capacity in the U.S. by 2025 and more than 8,000 megawatts by 2030. Aside from the U.S., Repsol owns renewable energy assets in Chile, Italy, Portugal, and Spain.

In the U.S., Repsol, ConnectGen, and other companies are capitalizing on tax credits contained in the federal Inflation Reduction Act of 2022 that are designed to spark development of clean energy projects. The law earmarks nearly $400 billion in federal funding for clean energy initiatives.

A new study funded by the BlueGreen Alliance, a group backed by labor unions and environmental organizations, indicates the law could add more than 1.5 million jobs in the solar and wind power sectors by 2035. Tens of thousands of these jobs will undoubtedly be created in Texas.

The White House estimates the Inflation Reduction Act will spur $66.5 billion in Texas investments in large-scale clean power generation and storage projects between now and 2030.

“Strengthening our energy security advances two goals: It lowers costs for all Americans by ensuring a resilient and affordable supply of clean energy, and it fosters American innovation in difficult-to-decarbonize sectors,” Lily Batchelder, assistant secretary for tax policy at the U.S. Treasury Department, said in a recent update about the law.

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Rice University spinouts named among 50 top cleantech companies to watch

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Two Rice University spinouts, Coflux Purification and DexMat, appear on a new list of the world’s 50 cleantech companies to watch.

Cleantech Group’s 2026 Cleantech 50 to Watch list recognizes early-stage companies “creating groundbreaking solutions to address some of the world’s most pressing environmental and sustainability challenges.”

Cleantech Group, a market research, consulting, and events company, selects the 50 honorees based on insights from analysts and early-stage innovators, along with public nominations.

Destroying “forever chemicals”

Coflux, founded in 2024, offers an onsite treatment system that captures and destroys manufactured “forever chemicals”—per- and polyfluoroalkyl substances—in water and wastewater. It’s a member of Greentown Houston.

Alec Ajnsztajn, CEO; Jeremy Daum, chief technology officer; and Dana Vazquez, chief commercial officer, co-founded Coflux. Ajnsztajn and Daum earned doctoral degrees from Rice, and Vazquez earned an MBA from the university.

Coflux spun out of Rice labs directed by professors Rafael Verduzco and Pulickel Ajayan.

Last year, Coflux received a $175,000 grant from the U.S. Food and Drug Administration’s National Institute of Food and Agriculture. The startup has also raised more than $500,000 in non-dilutive funding, including $80,000 awarded in 2024 by Rice’s One Small Step Grant program.

Promoting an alternative to copper

DexMat, founded in 2015, produces carbon nanotube products such as fibers, yarns, cables, and fabric. The company’s products address demand for materials that can reduce carbon emissions, according to CB Insights.

Its main product, Galvorn, is a copper alternative made of carbon nanotube fibers. CB Insights says Galvorn is engineered to be lighter and stronger than traditional conductive materials like carbon and steel. It’s used in industries such as energy, aerospace, defense, automotive, consumer electronics, and health care.

DexMat emerged from Matteo Pasquali’s Carbon Lab at Rice. Pasquali, co-founder of DexMat, co-invented the company’s technology with the late Nobel Prize-winning chemist Rick Smalley. Smalley was a professor of chemistry, physics, and astronomy at Rice.

Pasquali is a professor of chemical and biomolecular engineering, chemistry, materials science, and nanoengineering at Rice. He co-founded DexMat with Rice graduate Dmitri Tsentalovich, the company’s director of product innovation.

Earlier this year, DexMat raised $5 million in seed funding from Non Sibi Ventures, Governance Partners, Tailwind Futures, BetterWay, Capital Factory, and other investors. The company also secured $3 million in non-dilutive funding.

In 2023, DexMat raised $3 million in a pre-seed round led by Shell Ventures.

Stardust Power, Power Electronics expand to Houston and more top energy news

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Editor's note: October brings big updates for the energy transition sector, with two companies expanding to Houston and two more announcing major funding. Here are the five most-read stories published on EnergyCapital from September 30-October 15, 2026:

Lithium refiner expands into Houston with new Energy Corridor office

Battery-grade lithium carbonate manufacturer Stardust Power has expanded into Houston’s Energy Corridor, the company tells EnergyCapitalHTX. The company’s new office will serve as a project execution hub to support operations and planning for the company’s forthcoming lithium refinery in Muskogee, Oklahoma. The Greenwich, Connecticut-based, publicly traded company says the facility will be one of the largest lithium refining operations in the United States. The refinery is expected to have production capacity of up to 50,000 metric tons per year and seeks to address the critical shortage of U.S. lithium refining capacity. Continue reading.

Houston geothermal company picks Nevada site for commercial-scale project

Sage Geosystems, a Houston-based developer of geothermal power systems, has chosen a site in Nevada for its commercial-scale Project Vector facility. The company’s two-well enhanced geothermal system (EGS) will deliver around-the-clock geothermal heat to Ormat Technologies’ Blue Mountain geothermal power plant in Winnemucca, Nevada. The startup expects to begin drilling the first well later this year, with the first electricity to be generated in 2027 and full-scale production to start in 2028. Continue reading.

Houston carbon removal company secures $35M in financing

Houston-based Vaulted Deep, a waste management and carbon removal company, has announced a major $35 million debt facility from Italian investment bank Mediobanca to support its national expansion. U.K.-based market energy solutions CFP Energy arranged the deal, which is “the largest publicly disclosed U.S. commercial debt deal in durable carbon removal to be secured by long-term purchase contracts,” according to a news release from the companies. Continue reading.

Hertha Metals raises $133M Series A round, plans high-purity iron plant

Conroe-based Hertha Metals has closed a $133.65 million Series A round that includes a $65 million equity investment from the Pentagon. The startup uses a one-step process to convert iron into molten steel or high-purity iron. Khosla Ventures and Doerr Capital co-led the round, with participation from CEV, Pear Ventures, Gates Frontier, Niterra SUISO no MORI Fund, Toyota Ventures, and Siemens Financial Services. Continue reading.

European cleantech company breaks ground on Houston manufacturing site

Spanish renewable energy company Power Electronics broke ground on its new 53-acre Houston campus on Sept. 24. The new site is expected to create over 400 local jobs and deliver 40 gigawatts of production capacity per year. The company said that the campus is expected to be the largest manufacturing site for power conversion systems in the U.S. Power Electronics specializes in solar, energy storage, data centers and electrification technologies. Continue reading.

TotalEnergies expands solar joint venture with $1.2B portfolio in Texas, Ohio

solar expansion

TotalEnergies, a French company whose U.S. headquarters is in Houston, announced this month that it is expanding its renewable energy joint venture with New York-based investment firm KKR by adding 700 megawatts of utility-scale solar projects.

The deal will add three utility-scale solar assets in Texas and Ohio, which are expected to reach commercial operation by Q1 2027, according to a news release from the company. The portfolio is valued at $1.2 billion.

The 50/50 joint venture between TotalEnergies and KKR currently holds 1.4 gigawatts of renewable energy and will grow to 2.1 gigawatts.

The new deal is expected to close this year. Once completed, TotalEnergies will operate the assets. The electricity generated from the solar projects will be sold to third parties, the company reports.

The companies originally formed the joint venture about a year ago when TotalEnergies sold KKR a 50 percent stake in a North American solar portfolio valued at $1.25 billion. The deal originally included six utility-scale solar assets, primarily located in the U.S.

“TotalEnergies is a renewable energy industry leader globally, and we are thrilled to establish this joint venture with the TotalEnergies team to support their renewables business," Cecilio Velasco, managing director KKR, said in a release last year. “We have long been investors in renewables through our infrastructure platform, having committed more than $23 billion to date in energy transition investments. TotalEnergies’ North American solar portfolio is a great fit for us, representing high-quality renewable energy assets with long term contracts.”

TotalEnergies reports that by June 2026 it held more than 37 gigawatts of gross renewable power generation capacity. It aims to achieve over 100 terawatt-hours of net electricity production by 2030.

The company signed a major power purchase agreement with Google earlier this year. Through the deal, TotalEnergies will supply the tech giant with 1 gigawatt of solar power for its data centers in Texas over a 15-year span.

However, the company also recently redirected nearly $1 billion in capital away from wind energy projects and "decided to renounce offshore wind development in the United States." Read more here.

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