Helping climatetech startupsTransformindustry faster

Type One Energy
Energy & Power

SWERV
Infrastructure & Construction
Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation

Suyana Climate Insurance

OffGridBox
Food, Water, & Land

Medley Thermal
Energy & Power
Medley Thermal — links clean, cheap power to steam heating systems, lowering a customer's energy costs and carbon emissions.

Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management

Understory
Infrastructure & Construction
Weather hardware and analytics

PurposeEnergy
Food, Water, & Land

Verdox Inc
Manufacturing & Processing
Verdox — is making scalable, cost-effective carbon capture and removal a reality. Founded in late 2019 by Dr. Brian Baynes, Prof. T. Alan Hatton, and Dr. Sahag Voskian, the company is commercializing its electroswing adsorption (ESA) platform technology, originally developed at MIT, to remove carbon dioxide from industrial emissions and the air with 70% energy savings versus conventional approaches.

Octavia Carbon Co
Manufacturing & Processing
Geothermal heat to capture and mineralize CO₂

Aeon Blue Technologies
Manufacturing & Processing
By matching chemical plant production with green variable power, ABT offers a solution that can boost profit margins by reducing electricity costs, making plants safer for employees and surrounding communities, and solving one of the most pressing challenges faced by the industrial sector: manufacturing without carbon. Aeon Blue aims for swift deployment of its advanced intermittency technology through licensing and EPC support with a fee and royalties model.

Promethean Power Systems
Food, Water, & Land
Promethean Power Systems — has developed and deployed its patented Thermal Battery technology that is being used by over 65,000 farmers in India and Bangladesh to chill their harvested perishable food and milk and get it to the market safely without the need for diesel generators. In addition to village-level cold-storage, Promethean now operates diesel-free reefer trucks using its thermal battery technology that deliver refrigerated food without the need for compressors on its trucks.

Opus One Solutions
Energy & Power

Emerald Cities Collaborative
Infrastructure & Construction

Carbfix
Manufacturing & Processing

Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market

CLS Wind
Energy & Power
Self-erecting system for installing wind turbines

SpadXTech
Food, Water, & Land
SpadXTech — seeks to significantly reduce CO2 emissions through the manufacturing of various carbon negative cellulose-based materials.

Boronite
Manufacturing & Processing

Fresh Inset
Food, Water, & Land
Improving fresh produce’s shelf life, appearance, and quality

Type One Energy
Energy & Power

SWERV
Infrastructure & Construction
Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation

Suyana Climate Insurance

OffGridBox
Food, Water, & Land

Medley Thermal
Energy & Power
Medley Thermal — links clean, cheap power to steam heating systems, lowering a customer's energy costs and carbon emissions.

Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management

Understory
Infrastructure & Construction
Weather hardware and analytics

PurposeEnergy
Food, Water, & Land

Verdox Inc
Manufacturing & Processing
Verdox — is making scalable, cost-effective carbon capture and removal a reality. Founded in late 2019 by Dr. Brian Baynes, Prof. T. Alan Hatton, and Dr. Sahag Voskian, the company is commercializing its electroswing adsorption (ESA) platform technology, originally developed at MIT, to remove carbon dioxide from industrial emissions and the air with 70% energy savings versus conventional approaches.

Octavia Carbon Co
Manufacturing & Processing
Geothermal heat to capture and mineralize CO₂

Aeon Blue Technologies
Manufacturing & Processing
By matching chemical plant production with green variable power, ABT offers a solution that can boost profit margins by reducing electricity costs, making plants safer for employees and surrounding communities, and solving one of the most pressing challenges faced by the industrial sector: manufacturing without carbon. Aeon Blue aims for swift deployment of its advanced intermittency technology through licensing and EPC support with a fee and royalties model.

Promethean Power Systems
Food, Water, & Land
Promethean Power Systems — has developed and deployed its patented Thermal Battery technology that is being used by over 65,000 farmers in India and Bangladesh to chill their harvested perishable food and milk and get it to the market safely without the need for diesel generators. In addition to village-level cold-storage, Promethean now operates diesel-free reefer trucks using its thermal battery technology that deliver refrigerated food without the need for compressors on its trucks.

Opus One Solutions
Energy & Power

Emerald Cities Collaborative
Infrastructure & Construction

Carbfix
Manufacturing & Processing

Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market

CLS Wind
Energy & Power
Self-erecting system for installing wind turbines

SpadXTech
Food, Water, & Land
SpadXTech — seeks to significantly reduce CO2 emissions through the manufacturing of various carbon negative cellulose-based materials.

Boronite
Manufacturing & Processing

Fresh Inset
Food, Water, & Land
Improving fresh produce’s shelf life, appearance, and quality

Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material

Raise Green
Energy & Power
Raise Green — helps make it easy to start your own solar energy project or climate action company. Anyone can start a project on Raise Green and bring clean energy to their business or community.

Energiency
Manufacturing & Processing

Biobot Analytics
Food, Water, & Land

Skylark Wireless
Manufacturing & Processing
Far more than 5G: Skylark builds affordable, long-range, and high-speed wireless systems for rural broadband providers.

Sunwealth
Energy & Power

Arista Solutions

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

COI Energy
Energy & Power
AI and machine learning to predict and prevent energy waste

Renewell Energy
Energy & Power
Gravitational energy storage

Blue Line Battery
Energy & Power
Blue Line Battery designs and manufactures more accessible, more efficient, battery technology for industrial applications.

AquaNRG
Energy & Power
AquaNRG is provider of advanced technologies for subsurface energy and environmental applications. AquaNRG's technology has been funded through $1.4M grants by the US Department of Energy and National Science Foundation.

Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers

Axis Sky Renewables
Energy & Power
-- creates innovative wind solutions, specializing in vertical axis wind turbines. Its cutting-edge technology is less expensive than traditional wind turbines to produce, deploy and maintain while still producing reliable renewable energy.

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.

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization

Dugu Systems
Energy & Power
Zero-carbon power with an emissions-free gas turbine

Mitico
Energy & Power
C-Quester delivers a solution for carbon capture using dry granular metal carbonate (GMC) purification technology with integrated measurement, reporting, and verification.

Hygen
Energy & Power

Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material

Raise Green
Energy & Power
Raise Green — helps make it easy to start your own solar energy project or climate action company. Anyone can start a project on Raise Green and bring clean energy to their business or community.

Energiency
Manufacturing & Processing

Biobot Analytics
Food, Water, & Land

Skylark Wireless
Manufacturing & Processing
Far more than 5G: Skylark builds affordable, long-range, and high-speed wireless systems for rural broadband providers.

Sunwealth
Energy & Power

Arista Solutions

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

COI Energy
Energy & Power
AI and machine learning to predict and prevent energy waste

Renewell Energy
Energy & Power
Gravitational energy storage

Blue Line Battery
Energy & Power
Blue Line Battery designs and manufactures more accessible, more efficient, battery technology for industrial applications.

AquaNRG
Energy & Power
AquaNRG is provider of advanced technologies for subsurface energy and environmental applications. AquaNRG's technology has been funded through $1.4M grants by the US Department of Energy and National Science Foundation.

Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers

Axis Sky Renewables
Energy & Power
-- creates innovative wind solutions, specializing in vertical axis wind turbines. Its cutting-edge technology is less expensive than traditional wind turbines to produce, deploy and maintain while still producing reliable renewable energy.

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.

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization

Dugu Systems
Energy & Power
Zero-carbon power with an emissions-free gas turbine

Mitico
Energy & Power
C-Quester delivers a solution for carbon capture using dry granular metal carbonate (GMC) purification technology with integrated measurement, reporting, and verification.

Hygen
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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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.






















