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40+ climatetech startups join Greentown, including a dozen from Houston

green team

Twelve local startups have joined Greentown Houston, along with others from around the world. Photo courtesy Greentown Labs.

More than 40 climatetech startups joined the Greentown Labs Houston community in the second half of 2025. Twelve hail from the Bayou City.

The companies are among a group of nearly 70 that joined the climatetech incubator, which is co-located in Houston and Boston, in Q3 and Q4.

The new companies that have joined the Houston incubator specialize in a variety of clean energy applications, from green hydrogen-producing water-splitting cycles to drones that service wind turbines.

The local startups that joined Greentown Houston include:

  • Houston-based Wise Energie, which delivers turnkey microgrids that blend vertical-axis wind, solar PV, and battery storage into a single, silent system.
  • The Woodlands-based Resollant, which is developing compact, zero-emissions hydrogen and carbon reactors to provide low-cost, scalable clean hydrogen and high-purity carbon for the energy and manufacturing sectors.
  • Houston-based ClarityCastle, which designs and manufactures modular, soundproof work pods that replace traditional drywall construction with reusable, low-waste alternatives made from recycled materials.
  • Houston-based WattSto Energy, which manufactures vanadium redox flow batteries to deliver long-duration storage for both grid-scale projects and off-grid microgrids.
  • Houston-based AMPeers, which delivers advanced, high-temperature superconductors in the U.S. at a fraction of traditional costs.
  • Houston-based Biosimo, which is developing bio-based platform chemicals, pioneering sustainable chemistry for a healthier planet and economy.
  • Houston-based Ententia, which offers purpose-built, generative AI for industry.
  • Houston-based GeoKiln Energy Innovation, which is developing a new way to produce clean hydrogen by accelerating natural geologic reactions in iron-rich rock formations using precision electrical heating.
  • Houston-based Timbergrove, which builds AI and IoT solutions that connect and optimize assets—boosting visibility, safety, and efficiency.
  • Houston-based dataVediK, which combines energy-domain expertise with advanced machine learning and intelligent automation to empower organizations to achieve operational excellence and accelerate their sustainability goals.
  • Houston-based Resonant Thermal Systems, which uses a resonant energy-transfer (RET) system to extract critical minerals from industrial and natural brines without using membranes or grid electricity.
  • Houston-based Torres Orbital Mining (TOM),which develops autonomous excavation systems for extreme environments on Earth and the moon, enabling safe, data-driven resource recovery and laying the groundwork for sustainable off-world industry.

Other startups from around the world joined the Houston incubator in the same time period, including:

More than 100 startups joined Greentown this year, according to an end-of-year reflection shared by Greentown CEO Georgina Campbell Flatter.

Flatter joined Greentown in the top leadership role in February 2025. She succeeded former CEO and president Kevin Knobloch, who stepped down in July 2024.

"I moved back to the United States in March 2025 after six years overseas—2,000 miles, three children, and one very patient husband later. Over these months, I’ve had the chance to hear from the entrepreneurs, industry leaders, investors, and partners who make this community thrive. What I’ve experienced has left me brimming with urgent optimism for the future we’re building together," she said in the release.

According to Flatter, Greentown alumni raised more than $2 billion this year and created more than 3,000 jobs.

"Greentown startups and ecosystem leaders—from Boston, Houston, and beyond—are showing that we can move further and faster together. That we don’t have to choose between more energy or lower emissions, or between increasing sustainability and boosting profit. I call this the power of 'and,'" Flatter added. "We’re working for energy and climate, innovation and scale, legacy industry and startups, prosperity for people and planet. The 'and' is where possibility expands."

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Rice, UH launch joint effort to accelerate plastics recycling solutions

plastics partnership

Institutes at two Houston universities are joining forces to help position the city as a global leader in plastics recycling innovation.

The Center for Energy Studies (CES) at Rice University’s Baker Institute for Public Policy and the University of Houston’s Energy Transition Institute (UH-ETI) have announced a strategic partnership that aims to develop real-world solutions for plastic recycling.

The universities will kick off the new initiative with the Annual Sustainability Summit: Innovations and Collaborations in Circularity & Supply Chain Resilience event April 22 at the Baker Institute.

“Houston sits at the center of the global plastics and petrochemical value chain, which makes it uniquely positioned to lead in circular solutions,” Rachel Meidl, deputy director of CES, said in a news release. “This partnership is about moving beyond theory and bringing together data, policy and industry insight to accelerate technologies and frameworks that can scale.”

The partnership—which was made official during CERAWeek—will integrate policy, economics, science and engineering. The universities will work to “share data, insights, networks and connections to advance global work in protecting the environment, economy and society,” according to a news release from Rice.

Initially, the universities will focus on evaluating scalable advanced recycling pathways, developing policy frameworks to improve plastics circularity, analyzing emerging technology and using industry stakeholders for deployment.

Plastics circularity aligns with Rice and UH’s energy transition efforts to advance a circular economy. UH's ETI recently published a white paper that analyzes how the U.S. currently handles plastics recycling and advocates for a new approach. Ramanan Krishnamoorti, author of the paper and vice president of energy and innovation at UH, said the partnership with Rice’s Baker Institute could help bring some of the ideas outlined in the paper to reality.

“Our research has shown that a uniform approach may be the best way for the U.S. to tackle plastic waste,” Krishnamoort said in a news release. “By partnering with Rice’s Baker Institute for Public Policy, we will be better positioned to deliver real-world solutions that advance a circular plastics economy.”

Fervo Energy adds former eBay CEO Meg Whitman, other leaders to board

power players

As it prepares for a highly anticipated IPO, Houston-based geothermal power provider Fervo Energy has added four heavyweights to its board of directors.

The most notable new board member is Meg Whitman, former CEO of eBay, Hewlett-Packard, and Spring-based HPE, and former U.S. ambassador to Kenya. She joined the Fervo board as lead independent director.

One of the other high-profile new board members at Fervo is Jessica Uhl. She was chief financial officer of Shell from 2017 to 2022 and spent a little over a year as president of GE Vernova, a GE energy spinoff. She is a former board member of GE, Goldman Sachs and Shell. Today, Uhl advises investment firms on energy matters.

Another energy industry veteran, Trey Lowe, also joined the Fervo board. Lowe is senior vice president and chief technology officer at oil and gas producer Devon Energy, a Fervo investor that’s moving its headquarters from Oklahoma City to Houston. Before Devon, Lowe worked in the U.S. and Norway for Houston-based energy technology company SLB.

The fourth new director at Fervo is Robert Keehan, who spent 37 years at professional services firm PwC. He most recently was PwC’s chief global auditor and earlier was a partner in the firm’s energy practice.

Keehan and Uhl will serve as independent directors, which are non-executive governance and oversight roles, while Lowe is a non-independent director, which is a more hands-on role.

With the four new directors, Fervo has seven board members.

The arrival of the four new board members comes at a monumental time for Fervo, a provider of utility-scale geothermal energy:

“Energy markets are demanding dependable, carbon-free power at an unprecedented scale, and Fervo is uniquely positioned to supply it,” Tim Latimer, co-founder and CEO of Fervo, said in December.

8 Houston companies earn CleanTech Breakthrough Awards

winner, winners

Eight cleantech companies with Houston headquarters were recognized in this year’s CleanTech Breakthrough Awards program.

CleanTech Breakthrough, part of market intelligence platform Tech Breakthrough, honors innovative and influential energy, climate, and cleantech companies, products and services.

This year’s winners from Houston are:

  • CleanTech Analytics Company of the Year: Amperon, a provider of AI-powered energy forecasting software
  • Overall Hydrogen Solution of the Year: Eclipse Energy, which converts maxed-out oilfields into low-cost sources of hydrogen
  • Energy Production Company of the Year: Fervo Energy, a provider of geothermal power
  • Production Solution of the Year: Quaise Energy, a developer of a drilling system for converting traditional power stations into geothermal energy plants
  • Green Materials Solution of the Year: Solidec, which uses air, water, and electricity to produce chemicals
  • Hydrogen Production Solution of the Year: VEMA Hydrogen, a producer of renewable hydrogen
  • CleanTech Analytics Innovation Award: Finland-based Wärtsilä, a provider of advanced energy storage systems and services, which maintains its U.S. headquarters in Houston
  • Energy Production Platform of the Year: France-based energy giant TotalEnergies, which maintains its U.S. headquarters in Houston

Other Texas companies made the list, including Austin-headquartered Base Power, founded by Justin Lopas and Zach Dell. Zach Dell is the son of Austin billionaire and Houston native Michael Dell, chairman and CEO of Dell Technologies. The company recently started servicing Houston and established an office in Katy.

CleanTech Breakthrough says its annual awards program honors “the visionaries and leaders accelerating the transition to a cleaner, more sustainable future.”

“In a world increasingly focused on sustainability and environmental responsibility, innovation in clean technology has never been more critical,” said Bryan Vaughn, managing director of CleanTech Breakthrough. “This year’s winners represent the very best in ingenuity and execution, delivering solutions that not only reduce environmental impact but also drive efficiency, scalability and real-world results.”

See the full list of the 2026 winners here.
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