Helping climatetech startupsTransformindustry faster

GeoTeknica
Manufacturing & Processing

Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably

Carbon Negative Solutions
Infrastructure & Construction

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

Infranergy
Energy & Power

Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage

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
Energy & Power

Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

RailPod
Transportation & Logistics

Dexai Robotics
Food, Water, & Land

Halo Energy
Energy & Power

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

New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI

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
Manufacturing & Processing

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

Planetary Hydrogen
Manufacturing & Processing

CemCycle
Manufacturing & Processing

GeoTeknica
Manufacturing & Processing

Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably

Carbon Negative Solutions
Infrastructure & Construction

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

Infranergy
Energy & Power

Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage

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
Energy & Power

Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

RailPod
Transportation & Logistics

Dexai Robotics
Food, Water, & Land

Halo Energy
Energy & Power

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

New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI

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
Manufacturing & Processing

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

Planetary Hydrogen
Manufacturing & Processing

CemCycle
Manufacturing & Processing

Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more

GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale

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

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

Dottir Labs
Food, Water, & Land
Sensor technology that provides real-time, detailed chemical analysis of water

Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds

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
Energy & Power
Gravitational energy storage

QuEra Computing

CGIS
Energy & Power

SWTCH Energy Inc.
Transportation & Logistics

Catalyxx
Manufacturing & Processing
Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals

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
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
Transportation & Logistics

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
Energy & Power
Helping climatetech companies translate complex work into compelling brands

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

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

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

GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale

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

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

Dottir Labs
Food, Water, & Land
Sensor technology that provides real-time, detailed chemical analysis of water

Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds

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
Energy & Power
Gravitational energy storage

QuEra Computing

CGIS
Energy & Power

SWTCH Energy Inc.
Transportation & Logistics

Catalyxx
Manufacturing & Processing
Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals

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
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
Transportation & Logistics

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
Energy & Power
Helping climatetech companies translate complex work into compelling brands

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

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

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.




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.
Our Startups Have Raised Over $0B
All-time
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Currently home to
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Startups Operate
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New Jobs Created by Our Members, and Counting
Startups bring the breakthroughs. Corporate partners bring the scale, infrastructure, expertise, and capital to make them matter.
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.


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.

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.

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






















