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Dear Friends of Greentown,

As 2025 comes to a close, we’re celebrating the entrepreneurs, industry partners, investors, and ecosystem leaders who have kept pushing the energy-transition forward!

50 startups joined our community this year, working on everything from high-temperature superconductors, to biomass-based graphite, to energy-efficient glass 3D printing, to recyclable countertops.

They joined dozens of startups working to decarbonize the key greenhouse-gas-emitting sectors and build resilient communities. This group of nearly 100 startups has had a banner year, from fundraises to partnerships to deployments. To name just a few of their milestones:

Cemvita established a subsidiary in Brazil; signed an agreement with the government of Rio Grande do Sul to deploy its bio-stimulation technologies at an industrial plant in Brazil that will produce carbon-negative industrial chemical byproducts; and finalized an agreement with Invest RS to build a facility in Brazil for the production of its sustainable FermOil™, which is a feedstock for sustainable air fuel.
Capwell launched its commercial unit to capture and destroy methane leaked by old oil and gas wells.
ATS Energy announced the world’s first commercial agreement for deployment of a megawatt-scale solid-state generator.
Haffner Energy signed a long-term sustainable aviation fuel offtake deal with Luxaviation. It was also selected for the first Renewable Energy Valley project, where it will partner on a bio-hydrogen plant that will produce 240 tonnes of mobility-grade hydrogen per year.

We also saw the power of Houston’s energy-transition ecosystem in action. The second annual Houston Energy and Climate Startup Week brought more than 3,900 attendees to over 30 events across the city, demonstrating Houston’s status as a leader in energy innovation. Greentown was excited to strike up partnerships with Energytech Nexus, Nominal, Shoreless, and MassChallenge this year to collaboratively support climatetech entrepreneurs—resulting in an Industrial Center of Excellence, a new AI lab, and deeper investor programming.

The region’s rich ecosystem was on full display at Greentown Houston’s Climatetech Summit last month, which highlighted startups’ climate and energy solutions while illuminating pathways for industry-wide collaboration. Check out key takeaways and recordings from the event!

We’re excited to keep innovating, connecting, and celebrating with you in 2026! Until then, we hope you have a wonderful and restful end of the year.

Warmly,
The Greentown Team

Mark Your Calendar for Our First Event of 2026!

Our first Transition on Tap of the New Year—in partnership with TotalEnergies—will be on Feb. 26! Register here.

Apply to Go Build 2026 with Amazon

Greentown Go Build 2026 with Amazon—and in collaboration with the Global CO₂ Initiative at the University of Michigan—is accepting startup applications through Jan. 9, 2026!

Go Build 2026 is accelerating the decarbonization of the built environment by advancing CO₂-mineralization technologies that turn captured carbon into aggregate for concrete—driving down embodied emissions in construction.

Selected startups will benefit from:

A structured accelerator platform for testing and exploration with Amazon
Desk space at Greentown for the duration of the program
Access to entrepreneur-focused programming and networking events
A needs-based stipend to support participation

LEARN MORE + APPLY BY JAN. 9

#FuelTheFuture

We’d like to share a heartfelt thank you to everyone who has supported our #FuelTheFuture challenge this fall.

The heart of this campaign is powering the entrepreneurs who are developing real solutions for a clean, sustainable future. Every dollar raised fuels what founders need most—from new prototyping tools to crucial programming.

We’re approaching our year-end goal, with a generous donor matching all donations up to $30,000!

DONATE TODAY

This Month's Startup News

Greentown alum Fervo Energy raised a $462M Series E funding round for continued deployment and commercialization of its next-generation geothermal technology.
Haffner Energy secured a major technology-licensing, joint-venture, and 5 MW pilot project partnership with a Canadian partner.
Eleven Greentown members were named to Forbes’ 2026 30 Under 30 list, including Houston member FlowCellutions' Becca Segel.

Recent Reads

Our Ecosystem Exchange with Woodside Energy and Equinor brought seven Australian and Norwegian startups to Houston this fall.

Check out how the week led to a signed customer agreement, 10+ meetings with global energy and industrial corporations, and more.

Entering new markets isn't easy—and neither is setting up a manufacturing facility.

NOC Energy leveraged an assist from Greentown's partnerships team to set up a French subsidiary for its high-heat industrial decarbonization technology. Read the full case study.

Houston Newsletter — December 2025

From The Ecosystem

Houston Newsletter — December 2025