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Dear Friends of Greentown,

As 2025 draws to a close, I’m approaching one year as CEO of Greentown. And what a ride it’s been—full of learning, listening, and being inspired.

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.

In a year with legislative and economic headwinds, our startups and alumni raised more than $2B to power their solutions. They created more than 3,000 green jobs, showing that climate and energy solutions have rippling effects throughout regions’ economies.

Greentown welcomed over 100 new members in 2025, working on everything from refrigerant-free heat pumps, to biomass-based graphite, to geothermal-powered carbon capture, to recyclable countertops. Our full community—more than 200 startups strong—is deploying climatetech solutions at speed and at scale. They’re demonstrating the immense power of entrepreneurship.

Check out some of their top wins of the year, including:

Laminar (formerly H2Ok Innovations) is scaling its water-saving, advanced sensors to AB InBev’s global breweries across six geographical zones and raised a $12.4M Series A.
American Battery Technology Company was selected to recycle batteries in a ~$30M project, one of the United States’s largest lithium-ion battery cleanups in history.
Haffner Energy signed a long-term sustainable aviation fuel offtake deal with Luxaviation and is partnering on a bio-hydrogen plant that will produce 240 tonnes of mobility-grade hydrogen per year.
Dandelion Energy is integrating its geothermal systems into over 1,500 homes built by Lennar Corporation in Colorado, in one of the United States’s largest residential geothermal deployments.
Cemvita established a subsidiary in Brazil and finalized an agreement to build a facility there to produce its sustainable FermOil™, which is a feedstock for sustainable air fuel.

In this first year at Greentown, I’ve also had the chance to see the power of collaboration. Because breakthroughs don’t scale in isolation—they scale when entire ecosystems move together.

Founders bring bold ideas and relentless drive; partners bring the markets, resources, and reach to make them real. Policymakers, investors, industries, and communities are not just bystanders—they are catalysts. When these forces rally around entrepreneurs, ideas move from prototype to pilot to global impact at the pace the world requires.

What does this look like in practice?

Take Houston Energy and Climate Startup Week, which in its second year brought more than 3,900 attendees to over 30 events across the city, demonstrating Houston’s status as a leader in energy innovation.

Or Greentown’s 2025 Climatetech Summit, which brought together more than 1,000 climatetech champions, highlighted startups’ climate and energy solutions, and illuminated pathways for industry-wide collaboration.

Or our four open-innovation programs, which accelerated sustainable innovation across carbontech, next-gen recycling, personal care, and more.

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.”

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.

There are so many people who have to come together to do this work. There’s the entrepreneurs, the investors, the industry leaders, the policymakers, the philanthropists, the startup-support organizations. We all have a role to play and should be proud of this future we’re building together.

We couldn’t do it without you. As 2025 comes to a close and we look forward to the year ahead, my ask is this: join me in moving with urgent optimism to fuel a future with more energy and less emissions. Whether that’s partnering with Greentown and our startups, joining our community, supporting Greentown as part of your year-end giving, or coming to work at one of our companies—we need you in this.

Thank you for everything you do. Let’s keep working together to make the impossible possible.

Warmly,
Georgie

Georgina Campbell Flatter
CEO, Greentown Labs

MAKE A YEAR-END DONATION

Meet Our Newest Members

55 startups joined our community this quarter, working on technologies ranging from refrigerant-free heat pumps, to recyclable countertops, to geothermal-powered carbon capture! Read about them here.

Apply Now: 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

Join Our First Events of 2026

Feb. 5: EnergyBar: Looking Ahead Together [Greentown Boston]

Our first EnergyBar of the year will celebrate 15 years of Greentown! Join us for our signature networking event where we’ll look ahead to 2026 and the next 15 years of climate action. Register here.

Feb. 26: Transition on Tap [Greentown Houston]

The Greentown Houston community is bigger than ever before—with dozens of new startups welcomed in Q3 and Q4 2025, it’s time to meet these entrepreneurs! Join us to meet these founders and connect with the ecosystem at this Transition on Tap in partnership with TotalEnergies.

Greentown is Hiring a Chief of Staff

We're hiring a Chief of Staff! This role will blend strategic coordination, executive support, organizational connective tissue, and high-level communications to act as a force multiplier for leadership.

Interested candidates can learn more and apply here.

Recent Reads

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.

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.

$462M for Fervo Energy, a litany of workforce-development grants, a new 25k sq. ft. facility for Lydian, a partnership between Raptor Maps and Sabanci Renewables—there’s no shortage of startup news to celebrate this month! Check out the full roundup.

Urgent Optimism and the Power of ‘And’