Helping climatetech startupsTransformindustry faster

Reframe Systems
Infrastructure & Construction
Offsite construction of zero-carbon buildings with volumetric modules manufactured with robotic microfactories

Sealed
Infrastructure & Construction

Planetary Hydrogen
Manufacturing & Processing

Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels

Newfound Materials
Manufacturing & Processing
The synthesis design layer for making new materials.

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

Exakom
Manufacturing & Processing
Exakom — is a pioneer in developing innovative data analysis products for the industrial automation market.

Encore CO2
Manufacturing & Processing
Converting captured CO₂ into valuable industrial molecules

Applied Gaia
Food, Water, & Land
Sequestering carbon in the soil

Ecobrew
Food, Water, & Land
Recycling clean CO₂ at the source for a circular supply, local reuse, or sale

Intention
Energy & Power
Climate-infrastructure-investment platform

Corvus Robotics
Manufacturing & Processing

Green Path Strategies
Energy & Power

DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes

Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors

Emerald Cities Collaborative
Infrastructure & Construction

VesprSolar
Energy & Power
VesprSolar — is transforming how solar panels are installed. VesprSolar V-Clamp™ is a low-cost fastener that makes solar arrays more secure and faster to install.

Visolis
Infrastructure & Construction

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

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Reframe Systems
Infrastructure & Construction
Offsite construction of zero-carbon buildings with volumetric modules manufactured with robotic microfactories

Sealed
Infrastructure & Construction

Planetary Hydrogen
Manufacturing & Processing

Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels

Newfound Materials
Manufacturing & Processing
The synthesis design layer for making new materials.

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

Exakom
Manufacturing & Processing
Exakom — is a pioneer in developing innovative data analysis products for the industrial automation market.

Encore CO2
Manufacturing & Processing
Converting captured CO₂ into valuable industrial molecules

Applied Gaia
Food, Water, & Land
Sequestering carbon in the soil

Ecobrew
Food, Water, & Land
Recycling clean CO₂ at the source for a circular supply, local reuse, or sale

Intention
Energy & Power
Climate-infrastructure-investment platform

Corvus Robotics
Manufacturing & Processing

Green Path Strategies
Energy & Power

DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes

Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors

Emerald Cities Collaborative
Infrastructure & Construction

VesprSolar
Energy & Power
VesprSolar — is transforming how solar panels are installed. VesprSolar V-Clamp™ is a low-cost fastener that makes solar arrays more secure and faster to install.

Visolis
Infrastructure & Construction

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

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

CarTwin
Transportation & Logistics
CarTwin is unlocking the value of automative data by creating an integrated data ecosystem to drive actionable insight and predictive analytics to address the industry’s most pressing challenges. Its digital twin technology enables a diverse set of automotive use cases that power new innovations by connecting physical and digital worlds providing real-time operational awareness of vehicle, component, and manufacturing performance.

GeoTeknica
Manufacturing & Processing

Sheetak
Manufacturing & Processing
Based in Austin, Texas, Sheetak develops advanced thermoelectric, solid-state cooling, and energy harvesting technologies for high-performance electronics. With expertise in thermoelectric materials, device engineering, and U.S.-based manufacturing, Sheetak provides precision thermal management solutions for applications in photonics, telecommunications, aerospace, defense, computing, and medical systems.

Blue Atlas Robotics
Manufacturing & Processing

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.

MoveEV
Transportation & Logistics
Mitigating Scope 1 & 3 emissions for businesses while providing cost savings for employees

Building Envelope Materials
Infrastructure & Construction

Innoveering
Manufacturing & Processing

InnoSepra
Energy & Power

Hunt Energy Enterprises
Energy & Power

Mass Magnetics
Manufacturing & Processing
MECo specializes in the automated manufacture of structured functional materials for magnetic and electrochemical applications.

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.

NeuroBionics
Manufacturing & Processing
Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation

Upstream Tech
Energy & Power
Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts

Nebumi
Energy & Power
Emissions intelligence platform, monitoring pollution with satellite data and AI

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

Lite-1
Manufacturing & Processing
Clean, scalable, microbe-made colour to replace toxic dyes

ZwitterCo
Food, Water, & Land
Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams

Halo Energy
Energy & Power

CarTwin
Transportation & Logistics
CarTwin is unlocking the value of automative data by creating an integrated data ecosystem to drive actionable insight and predictive analytics to address the industry’s most pressing challenges. Its digital twin technology enables a diverse set of automotive use cases that power new innovations by connecting physical and digital worlds providing real-time operational awareness of vehicle, component, and manufacturing performance.

GeoTeknica
Manufacturing & Processing

Sheetak
Manufacturing & Processing
Based in Austin, Texas, Sheetak develops advanced thermoelectric, solid-state cooling, and energy harvesting technologies for high-performance electronics. With expertise in thermoelectric materials, device engineering, and U.S.-based manufacturing, Sheetak provides precision thermal management solutions for applications in photonics, telecommunications, aerospace, defense, computing, and medical systems.

Blue Atlas Robotics
Manufacturing & Processing

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.

MoveEV
Transportation & Logistics
Mitigating Scope 1 & 3 emissions for businesses while providing cost savings for employees

Building Envelope Materials
Infrastructure & Construction

Innoveering
Manufacturing & Processing

InnoSepra
Energy & Power

Hunt Energy Enterprises
Energy & Power

Mass Magnetics
Manufacturing & Processing
MECo specializes in the automated manufacture of structured functional materials for magnetic and electrochemical applications.

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.

NeuroBionics
Manufacturing & Processing
Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation

Upstream Tech
Energy & Power
Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts

Nebumi
Energy & Power
Emissions intelligence platform, monitoring pollution with satellite data and AI

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

Lite-1
Manufacturing & Processing
Clean, scalable, microbe-made colour to replace toxic dyes

ZwitterCo
Food, Water, & Land
Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams

Halo Energy
Energy & Power




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
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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.






















