Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
GeoTeknica logo

GeoTeknica

Manufacturing & Processing

Arbor Energy Holdings Inc logo

Arbor Energy Holdings Inc

Energy & Power

Digital-energy platform to help homeowners live more sustainably

Carbon Negative Solutions logo

Carbon Negative Solutions

Infrastructure & Construction

AmHyTech logo

AmHyTech

Energy & Power

We build last-mile ammonia infrastructure for marine fuel, agriculture, and industrial applications.

Infranergy logo

Infranergy

Energy & Power

Ententia logo

Ententia

Energy & Power

Trusted, scalable enterprise AI solutions that turn context into competitive advantage

ETAK logo

ETAK

ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.

Monadnock Energy logo

Monadnock Energy

Energy & Power

Elementium Materials logo

Elementium Materials

Energy & Power

Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

RailPod logo

RailPod

Transportation & Logistics

Dexai Robotics logo

Dexai Robotics

Food, Water, & Land

Halo Energy logo

Halo Energy

Energy & Power

Maxwellian logo

Maxwellian

Energy & Power

Maxwellian — empowers mobility, energy, and agricultural industries by providing autonomous sanitization and monitoring solutions using unique optical IoT technology to ensure data accessibility for safety and asset management.

Mocean Energy logo

Mocean Energy

Energy & Power

Hybrid-offshore renewable power stations, combining wave, solar, and battery systems

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

INpower logo

INpower

INpower — is a specialty insurance brokerage & risk management firm that knows that business innovation generates risk. Their risk management mission is simple: to provide their clients with deep insurance expertise, thoughtful enterprise risk management counsel, and fierce claims advocacy supported by offices in: Houston, Boston and Irvine, California.

Energiency logo

Energiency

Manufacturing & Processing

Turnover Labs logo

Turnover Labs

Manufacturing & Processing

Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

Planetary Hydrogen logo

Planetary Hydrogen

Manufacturing & Processing

CemCycle logo

CemCycle

Manufacturing & Processing

GeoTeknica logo

GeoTeknica

Manufacturing & Processing

Arbor Energy Holdings Inc logo

Arbor Energy Holdings Inc

Energy & Power

Digital-energy platform to help homeowners live more sustainably

Carbon Negative Solutions logo

Carbon Negative Solutions

Infrastructure & Construction

AmHyTech logo

AmHyTech

Energy & Power

We build last-mile ammonia infrastructure for marine fuel, agriculture, and industrial applications.

Infranergy logo

Infranergy

Energy & Power

Ententia logo

Ententia

Energy & Power

Trusted, scalable enterprise AI solutions that turn context into competitive advantage

ETAK logo

ETAK

ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.

Monadnock Energy logo

Monadnock Energy

Energy & Power

Elementium Materials logo

Elementium Materials

Energy & Power

Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

RailPod logo

RailPod

Transportation & Logistics

Dexai Robotics logo

Dexai Robotics

Food, Water, & Land

Halo Energy logo

Halo Energy

Energy & Power

Maxwellian logo

Maxwellian

Energy & Power

Maxwellian — empowers mobility, energy, and agricultural industries by providing autonomous sanitization and monitoring solutions using unique optical IoT technology to ensure data accessibility for safety and asset management.

Mocean Energy logo

Mocean Energy

Energy & Power

Hybrid-offshore renewable power stations, combining wave, solar, and battery systems

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

INpower logo

INpower

INpower — is a specialty insurance brokerage & risk management firm that knows that business innovation generates risk. Their risk management mission is simple: to provide their clients with deep insurance expertise, thoughtful enterprise risk management counsel, and fierce claims advocacy supported by offices in: Houston, Boston and Irvine, California.

Energiency logo

Energiency

Manufacturing & Processing

Turnover Labs logo

Turnover Labs

Manufacturing & Processing

Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

Planetary Hydrogen logo

Planetary Hydrogen

Manufacturing & Processing

CemCycle logo

CemCycle

Manufacturing & Processing

Onvector logo

Onvector

Infrastructure & Construction

Non-chemical water treatment using plasma to rid water of PFAS and more

GigaDAC logo

GigaDAC

Energy & Power

Direct air capture optimized for gigaton scale

SEEDiA logo

SEEDiA

Energy & Power

SEEDiA — is making cities sustainable by reducing CO2 emissions and keeping citizen connected and charged up.

Massachusetts Materials Technologies logo

Massachusetts Materials Technologies

Energy & Power

Seamlessly measuring the mechanical properties of pipelines without interruption

Dottir Labs logo

Dottir Labs

Food, Water, & Land

Sensor technology that provides real-time, detailed chemical analysis of water

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

Focis AI logo

Focis AI

FocisAI uses AI and 3D scan data to automatically identify and map infrastructure in industrial facilities, turning complex environments into actionable digital intelligence. Our platform enables faster inspections, improved safety, and more efficient operations across heavy industry.

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

QuEra Computing logo

QuEra Computing

CGIS logo

CGIS

Energy & Power

SWTCH Energy Inc. logo

SWTCH Energy Inc.

Transportation & Logistics

Catalyxx logo

Catalyxx

Manufacturing & Processing

Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals

CalWave Power Technologies logo

CalWave Power Technologies

Energy & Power

CalWave — CalWave’s mission is to unlock the vast and steady carbon-free power from ocean waves, bringing superior power-generating technology to market with a global reach. CalWave’s proprietary wave energy converter technology achieves high performance while surviving storms and extreme conditions.

EcoForge logo

EcoForge

Food, Water, & Land

-- is a building material technology company developing affordable, high-performance building materials from local agricultural residues, replacing energy-intensive, fossil-based materials. This sustainable approach increases resilience to climate and supply chain risks, supports local farming, and job creation. Moreover, EcoForge’s toxic chemical-free material recipe promotes healthier indoor environments.

AmpUp logo

AmpUp

Transportation & Logistics

Vistex Composites logo

Vistex Composites

Manufacturing & Processing

Vistex Composites is a manufacturing innovation company that has developed disruptive technology for the manufacture of advanced composite products. Our patented PFL™ process can be integrated into existing manufacturing plants, or finished products can be manufactured with Vistex's in-house manufacturing team.

Capital Energy logo

Capital Energy

Energy & Power

Helping climatetech companies translate complex work into compelling brands

Maple Materials logo

Maple Materials

Manufacturing & Processing

Maple Materials (Richmond, California, U.S.) develops an electrolysis process to convert CO2 into graphite and oxygen.

Parasanti logo

Parasanti

Parasanti — is a data orchestration/edge computing firm, specializing in extreme operating environments within both the federal space and advanced energy solutions.

Eugenie logo

Eugenie

Manufacturing & Processing

Eugenie — has developed an AI-based predictive maintenance platform that reduces 3% of the total HC production losses suffered by upstream oil and gas operations, thus helping to reduce billions of metric tons of GHG emissions annually.

Onvector logo

Onvector

Infrastructure & Construction

Non-chemical water treatment using plasma to rid water of PFAS and more

GigaDAC logo

GigaDAC

Energy & Power

Direct air capture optimized for gigaton scale

SEEDiA logo

SEEDiA

Energy & Power

SEEDiA — is making cities sustainable by reducing CO2 emissions and keeping citizen connected and charged up.

Massachusetts Materials Technologies logo

Massachusetts Materials Technologies

Energy & Power

Seamlessly measuring the mechanical properties of pipelines without interruption

Dottir Labs logo

Dottir Labs

Food, Water, & Land

Sensor technology that provides real-time, detailed chemical analysis of water

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

Focis AI logo

Focis AI

FocisAI uses AI and 3D scan data to automatically identify and map infrastructure in industrial facilities, turning complex environments into actionable digital intelligence. Our platform enables faster inspections, improved safety, and more efficient operations across heavy industry.

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

QuEra Computing logo

QuEra Computing

CGIS logo

CGIS

Energy & Power

SWTCH Energy Inc. logo

SWTCH Energy Inc.

Transportation & Logistics

Catalyxx logo

Catalyxx

Manufacturing & Processing

Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals

CalWave Power Technologies logo

CalWave Power Technologies

Energy & Power

CalWave — CalWave’s mission is to unlock the vast and steady carbon-free power from ocean waves, bringing superior power-generating technology to market with a global reach. CalWave’s proprietary wave energy converter technology achieves high performance while surviving storms and extreme conditions.

EcoForge logo

EcoForge

Food, Water, & Land

-- is a building material technology company developing affordable, high-performance building materials from local agricultural residues, replacing energy-intensive, fossil-based materials. This sustainable approach increases resilience to climate and supply chain risks, supports local farming, and job creation. Moreover, EcoForge’s toxic chemical-free material recipe promotes healthier indoor environments.

AmpUp logo

AmpUp

Transportation & Logistics

Vistex Composites logo

Vistex Composites

Manufacturing & Processing

Vistex Composites is a manufacturing innovation company that has developed disruptive technology for the manufacture of advanced composite products. Our patented PFL™ process can be integrated into existing manufacturing plants, or finished products can be manufactured with Vistex's in-house manufacturing team.

Capital Energy logo

Capital Energy

Energy & Power

Helping climatetech companies translate complex work into compelling brands

Maple Materials logo

Maple Materials

Manufacturing & Processing

Maple Materials (Richmond, California, U.S.) develops an electrolysis process to convert CO2 into graphite and oxygen.

Parasanti logo

Parasanti

Parasanti — is a data orchestration/edge computing firm, specializing in extreme operating environments within both the federal space and advanced energy solutions.

Eugenie logo

Eugenie

Manufacturing & Processing

Eugenie — has developed an AI-based predictive maintenance platform that reduces 3% of the total HC production losses suffered by upstream oil and gas operations, thus helping to reduce billions of metric tons of GHG emissions annually.

Greentown member working in a wet lab
Greentown community members collaborating
Greentown member pipetting in a lab
Greentown members at work in the incubator
[ 03 ]Who We Are

Greentown is a 501(c)(3) nonprofit helping climate entrepreneurs build faster.

The way the world makes energy, materials, and food is changing — and the next decade will decide whether that change makes life better: more energy with fewer emissions, more industry with cleaner air, more good jobs.

That future comes from entrepreneurs — the heroes who turn ideas into real products, real companies, and the jobs of the future. And the ones who make it are the ones with a community behind them.

For 15 years, Greentown has been that community — leaning in with the space, the people, the funding, and the first customers they need. Get behind the entrepreneurs building our future.

[ 04 ]By The Numbers

Our Impact

Our members aren't just building better ways to operate; they're slashing emissions, boosting efficiency, and transforming how we use resources across the world. Now 15 years and counting, the impact speaks for itself.
Capital Mobilized

Our Startups Have Raised Over $0B

2011Now
Startups Supported

All-time

0

Currently home to

0

Global Footprint

0+

Countries Where
Startups Operate

Jobs Created

0

New Jobs Created by Our Members, and Counting

[ 05 ]Our Partners

Where Industry Meets Innovation

Startups bring the breakthroughs. Corporate partners bring the scale, infrastructure, expertise, and capital to make them matter.

  • Amazon
  • Amrize
  • Aramco
  • BCG
  • Chevron
  • Dassault Systemes
  • Emerson
  • Enel
  • Equinor
  • Foley Hoag
  • Fortescue
  • GeSI
  • GE Vernova
  • OnTerris (fka Montrose)
  • Saint-Gobain
  • Shell
  • TotalEnergies
  • Vinson & Elkins
  • Woodside Energy
For Startups

Apply for Membership

Ready to take your technology to the next level? Join the world's largest community of climatetech and energy entrepreneurs and fast-track your speed to market.

Greentown member prototyping hardware in the lab
For Partners
Greentown partners networking at an event

Become a Partner

Access the most concentrated pipeline of vetted climatetech companies in North America. Partner on pilots, invest, or join as a corporate sponsor.

Explore Partnership
Events
Speaker presenting on stage at a Greentown event

Get Involved

We pride ourselves on being a convener of the climatetech ecosystem. Join us at an upcoming event to explore all things climate action and collaboration.

View Calendar
For Investors
Founders and investors connecting at a Greentown incubator

Explore Investing

Tap into deal flow with the world’s largest community of climate and energy startups.

Explore Investing