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Greentown Labs announces newest startups to join Houston climatetech incubator

green team

Five companies have joined Greentown Labs Houston, specializing in various "green" applications, from converting plastic waste into sustainable materials to developing energy-storage solutions. Photo courtesy Greentown Labs.

Greentown Labs announced that it added five startups to its Houston community in Q1 of 2025.

The companies are among a group of 19 that joined the climatetech incubator, which is co-located in Houston and Boston, in the same time period. The companies that joined the Houston-based lab specialize in a number of "green" applications, from converting plastic waste into sustainable materials to developing energy-storage solutions.

The new Houston members include:

  • Concept Loop, a project of Pakistan-based Innova8e Inc., aims to repurpose post-industrial and post-consumer plastic waste into sustainable building materials.
  • GeoFuels, a Sugar Land-based company that produces hydrogen by using baseload geothermal power and methane pyrolysis.
  • PLASENE, a Houston-based company with an innovative platform that converts plastic waste into liquid fuel and low-carbon hydrogen through its proprietary catalysts and modular, scalable, pre-engineered units platform. The company was named to Greentown's ACCEL Year 3 cohort earlier this year.
  • RepAir Carbon, an Israeli company with a fully electric, zero-heat carbon-removal technology that consumes minimal energy, operates without liquids or solvents, and produces no hazardous materials or waste.
  • RotorVault from Pasadena, California, is commercializing energy-storage and load-following solutions that are containerized, modular, and field-deployable systems built on flywheel technology.

Fourteen other companies will join Greentown Boston's incubator. See the full list here.

PLASENE and five other new members—Thola, Respire Energy, Andros Innovations, FAST Metals and Tato Labs—join Greentown Labs through its most recent Advancing Climatetech and Clean Energy Leaders Program, or ACCEL, cohort. ACCEL, which works to advance BIPOC-led startups in the climatetech space, announced its third cohort last month.

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From potato-starch-based bioplastics startups to companies developing carbon-coated silicon anodes, here's who's joining Greentown Labs and Browning the Green Space's ACCEL program. Photo via browningthegreenspace.org

2 Houston startups join Greentown Labs' BIPOC-led accelerator program

seeing green

Greentown Labs and Browning the Green Space announced the newest cohort for its Advancing Climatetech and Clean Energy Leaders Program, or ACCEL, which works to advance BIPOC-led startups in the climatetech space.

Two Houston companies and one from Austin are among the eight startups to be named to the 2025 group.

“The startups selected for the third ACCEL cohort represent a phenomenal range of energy and climatetech innovations, which underscores our belief that everyone and many solutions must play a role in our community’s collective decarbonization efforts,” Georgina Campbell Flatter, Greentown’s new CEO, said in a release. “We’re proud to welcome these entrepreneurs to our community and eager to see all they’ll achieve throughout the program and beyond!”

Each of the early-stage startups within the cohort will receive $25,000 in non-dilutive grant funding and participate in the year-long program focused on product and technology development, market development, fundraising and management, and team development, according to Greentown. The curriculum is led by VentureWell, a nonprofit with expertise in venture development in climatetech.

The Houston companies include:

  • Carbonext, founded by Olanrewaju Tanimola. The company is leveraging its proprietary, off-the-shelf 3D-graphene technology to develop integrated solutions with carbon-coated silicon anodes to address challenges in the graphite ecosystem, as well as lithium-battery anodes.
  • PLASENE, founded by Sohel Shaikh, Alper Gulludag and Romolo Raciti. The company offers an innovative platform that converts plastic waste into liquid fuel and low-carbon hydrogen through its proprietary catalysts and modular, scalable, pre-engineered units

The remaining six companies are:

  • Inductive Robotics, founded in Austin by Madhav Ayyagari and David Alspaugh. The startup deploys autonomous robots that deliver EV charging directly to parked vehicles in commercial parking facilities, using a subscription-based model.
  • Andros Innovations, founded in Cambridge, Massachusetts by Laron Burrows. The startup has developed a reactor that produces ammonia more cheaply, cleanly and safely than traditional methods do.
  • FAST Metals, founded in Worcester, Massachusetts by Sumedh Gostu and Anthony Staley. It has developed a hydrometallurgical-recovery process capable of extracting iron, aluminum, scandium, titanium, and other rare-earth elements from industrial tailings.
  • Respire Energy, founded in Boston by Dave Hsu, Xiaowei Teng, and Candy Wong. The energy storage startup has developed a safe, low-cost, and long-duration metal-air battery designed for microgrids.
  • Tato Labs, founded in Brooklyn by Mecca McDonald and Mia Dunn. It is developing scalable, innovative, bioplastic products and packaging solutions that leverage potato starch, protect and preserve the natural ecosystem, and minimize plastic waste.
  • Thola, founded in Portland, Maine, by Nneile Nkholise and Lerato Takana. The company provides an on-demand marketplace for commercial-building sustainability and safety management, with a mission to decarbonize old buildings.

ACCEL is supported by the Massachusetts Clean Energy Center (MassCEC), Shell, Equinor, the Growth Capital Division of MassDevelopment, Microsoft and the Barr Foundation.

The accelerator has supported 13 early-stage startups since it was founded in 2023, resulting in $325,000 in grant funding. Houston companies have been represented in each cohort. Click here to see the 2024 cohort and here to see the inaugural 2023 cohort.

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Rice University team develops eco-friendly method to destroy 'forever chemicals' in water

clean water research

Rice University researchers have teamed up with South Korean scientists to develop the first eco-friendly technology that captures and destroys toxic “forever chemicals,” or PFAS, in water.

PFAS have been linked to immune system disruption, certain cancers, liver damage and reproductive disorders. They can be found in water, soil and air, as well as in products like Teflon pans, waterproof clothing and food packaging. They do not degrade easily and are difficult to remove.

Thus far, PFAS cleanup methods have relied on adsorption, in which molecules cling to materials like activated carbon or ion-exchange resins. But these methods tend to have limited capacity, low efficiency, slow performance and can create additional waste.

The Rice-led study, published in the journal Advanced Materials, centered on a layered double hydroxide (LDH) material made from copper and aluminum that could rapidly capture PFAS and be used to destroy the chemicals.

The study was led by Rice professor Youngkun Chung, a postdoctoral fellow under the mentorship of Michael S. Wong. It was conducted in collaboration with Seoktae Kang, professor at the Korea Advanced Institute of Science and Technology, and Keon-Ham Kim, professor at Pukyung National University, who first discovered the LDH material.

The team evaluated the LDH material in river water, tap water and wastewater. And, according to Rice, that material’s unique copper-aluminum layers and charge imbalances created an ideal binding environment to capture PFAS molecules.

“To my astonishment, this LDH compound captured PFAS more than 1,000 times better than other materials,” Chung, lead author of the study and now a fellow at Rice’s WaTER (Water Technologies, Entrepreneurship and Research) Institute and Sustainability Institute, said in a news release. “It also worked incredibly fast, removing large amounts of PFAS within minutes, about 100 times faster than commercial carbon filters.”

Next, Chung, along with Rice professors Pedro Alvarez and James Tour, worked to develop an eco-friendly, sustainable method of thermally decomposing the PFAS captured on the LDH material. They heated saturated material with calcium carbonate, which eliminated more than half of the trapped PFAS without releasing toxic by-products.

The team believes the study’s results could potentially have large-scale applications in industrial cleanups and municipal water treatments.

“We are excited by the potential of this one-of-a-kind LDH-based technology to transform how PFAS-contaminated water sources are treated in the near future,” Wong added in the news release. “It’s the result of an extraordinary international collaboration and the creativity of young researchers.”

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This article originally appeared on our sister site, InnovationMap.

6 must-attend Houston energy sector events in November 2025

Must-Attend Meetings

Editor's note: It's time to mark your calendar for November's must-attend Houston energy transition events, as they are front-loaded at the beginning fo the month. From a climatetech summit to the annual Houston Innovation Awards, these are the energy events to attend. Learn more below, and register now.

Nov. 4: Greentown Labs Climatetech Summit

Greentown Labs hosts its Houston Climatetech Summit, bringing together philanthropists, executives, and innovators in the energy transition space. Attendees will be able to explore climatetech solutions from dozens of startups, as well as hear insightful keynotes and discussions with industry leaders throughout the day.

The event begins with check-in and breakfast at 8 am on Nov. 4 at Greentown Labs. Register here.

Nov. 4-6: Operational Excellence in Oil and Gas Summit 2025

More than 300 industry leaders and change-makers will explore smarter, faster, more sustainable paths to operational excellence in the oil and gas industry at this annual three-day summit.

The event begins Nov. 4 at Norris Conference Center - City Centre Location. Register here.

Nov. 11-12: 20th Annual API Cybersecurity Conference for the Oil and Natural Gas Industry

The API Cybersecurity Conference has been an annual event since 2005. For 20 years, it has been the only cybersecurity conference dedicated to the oil and gas industry. Don't miss two days of compelling programming, networking and idea-exchange opportunities, as well as exhibitors sharing the latest products and services.

The event begins Nov. 11 at Woodlands Waterway Marriott. Register here.

Nov. 12-13: Energy Supply Chain & Procurement Summit

Senior executives from across the U.S. come to Houston, the energy capital, to discuss the energy supply chain, procurement and logistics ecosystems. The summit is focused on fostering dialogue and facilitating commercial relationships to further the mission of decarbonization and digitalization of the energy sector.

The event begins Nov. 12 at Hyatt Regency Houston West. Register here.

Nov. 13: Houston Innovation Awards

Houston's innovation ecosystem comes together for the fifth annual Houston Innovation Awards, taking place for the first time at Greentown Labs. Get your tickets to this intimate networking event and awards program, where winners in 10 prestigious categories — including Energy Transition Business, Scaleup of the Year, and Startup of the Year — will be revealed.

The event begins at 7 pm on Nov. 13 at Greentown Labs. Tickets are available here.

Nov. 14: Powering the Future via Geothermal, Lithium Extraction, and Battery Storage

Innovators and energy experts will converge for an in-depth panel discussion on how geothermal energy, lithium extraction and battery storage are shaping the next era of the low-carbon economy. At this event, hosted by Society for Low Carbon technologies, attendees will engage with thought leaders across sectors and explore how these technologies will help power a cleaner and smarter energy future.

This event begins at 9:10 am on Nov. 14 at NOV Towers. Register here.

Houston energy giants among top AI adopters and more news to know

Trending Topics

Editor's note: The top energy transition news for Oct. 15-31 includes AI integration among energy leaders and the most promising startups from an annual pitch competition. Here are the most-read EnergyCapitalHTX stories for the second half of October:

1. 2 Houston energy giants appear on Fortune’s inaugural AI ranking

ExxonMobil is on Fortune's first-ever AIQ ranking. Getty Images

Two Houston-area energy leaders appear on Fortune’s inaugural list of the top adopters of AI among Fortune 500 companies. They are: No. 7 energy company ExxonMobil, based in Spring and No. 47 energy company Chevron, based in Houston. They are joined by Spring-based tech company Hewlett Packard Enterprise, No. 19. All three companies have taken a big dive into the AI pool. Continue reading.

2. Energy Tech Nexus names 8 startup winners from Pilotathon pitch event

Eight startups were given awards at Energy Tech Nexus' Pilotathon. Photo via Getty Images.

Energy Tech Nexus held its Pilotathon and Showcase during the second annual Houston Energy & Climate Startup Week last month and granted awards to eight startups. This year's event, focused on the theme "Energy Access and Resilience," offered 24 startups an opportunity to pitch their pilot projects. Continue reading.

3. Houston organization proposes Gulf Coast index for hydrogen market

The Clean Hydrogen Buyers Alliance plans to create the Gulf Coast Hydrogen Index to bring to bring transparency and confidence to hydrogen pricing. Photo via Getty Images

The Clean Hydrogen Buyers Alliance has proposed an index aimed at bringing transparency to pricing in the emerging hydrogen market. The Houston-based alliance said the Gulf Coast Hydrogen Index, based on real-time data, would provide more clarity to pricing in the global market for hydrogen. The benchmarking effort is being designed to benefit clean hydrogen buyers, sellers and investors. The index would help position the U.S. “as the trading anchor for hydrogen’s next chapter as a globally traded commodity,” the alliance said. Continue reading.

4. Houston clean energy company to develop hybrid renewable project in Port Arthur

The new Pleasure Island Power Collective in Port Arthur is expected to generate 391 megawatts of clean power. Photo via unsplash.

Houston-based clean energy company Diligence Offshore Services has announced a strategic partnership with Florida-based floating solar manufacturing company AccuSolar for the development of a renewable energy project in the Port Arthur area. Known as the Pleasure Island Power Collective, it will be built on 2,275 acres across Pleasure Island and Sabine Lake. It is expected to generate 391 megawatts of clean power, alongside a utility-scale battery energy storage system. Continue reading.

5. Port Houston reports emissions progress as cargo volumes climb

Ric Campo says Port Houston is “moving in the right direction.” Photo via Getty Images.

Port Houston’s initiatives to reduce emissions have shown some positive results, according to new data from the Port of Houston Authority. Pulling from the Goods Movement Emissions Inventory (GMEI) report, which tracks port-related air emissions, Port Houston cited several improvements compared to the most recent report from 2019. Continue reading.

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