Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
Type One Energy logo

Type One Energy

Energy & Power

SWERV logo

SWERV

Infrastructure & Construction

Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation

Suyana Climate Insurance logo

Suyana Climate Insurance

OffGridBox logo

OffGridBox

Food, Water, & Land

Medley Thermal logo

Medley Thermal

Energy & Power

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

Thola logo

Thola

Energy & Power

On-demand marketplace for commercial building sustainability and safety management

Understory logo

Understory

Infrastructure & Construction

Weather hardware and analytics

PurposeEnergy logo

PurposeEnergy

Food, Water, & Land

Verdox Inc logo

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 logo

Octavia Carbon Co

Manufacturing & Processing

Geothermal heat to capture and mineralize CO₂

Aeon Blue Technologies logo

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 logo

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 logo

Opus One Solutions

Energy & Power

Emerald Cities Collaborative logo

Emerald Cities Collaborative

Infrastructure & Construction

Carbfix logo

Carbfix

Manufacturing & Processing

Ohm Analytics logo

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 logo

CLS Wind

Energy & Power

Self-erecting system for installing wind turbines

SpadXTech logo

SpadXTech

Food, Water, & Land

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

Boronite logo

Boronite

Manufacturing & Processing

Fresh Inset logo

Fresh Inset

Food, Water, & Land

Improving fresh produce’s shelf life, appearance, and quality

Type One Energy logo

Type One Energy

Energy & Power

SWERV logo

SWERV

Infrastructure & Construction

Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation

Suyana Climate Insurance logo

Suyana Climate Insurance

OffGridBox logo

OffGridBox

Food, Water, & Land

Medley Thermal logo

Medley Thermal

Energy & Power

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

Thola logo

Thola

Energy & Power

On-demand marketplace for commercial building sustainability and safety management

Understory logo

Understory

Infrastructure & Construction

Weather hardware and analytics

PurposeEnergy logo

PurposeEnergy

Food, Water, & Land

Verdox Inc logo

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 logo

Octavia Carbon Co

Manufacturing & Processing

Geothermal heat to capture and mineralize CO₂

Aeon Blue Technologies logo

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 logo

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 logo

Opus One Solutions

Energy & Power

Emerald Cities Collaborative logo

Emerald Cities Collaborative

Infrastructure & Construction

Carbfix logo

Carbfix

Manufacturing & Processing

Ohm Analytics logo

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 logo

CLS Wind

Energy & Power

Self-erecting system for installing wind turbines

SpadXTech logo

SpadXTech

Food, Water, & Land

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

Boronite logo

Boronite

Manufacturing & Processing

Fresh Inset logo

Fresh Inset

Food, Water, & Land

Improving fresh produce’s shelf life, appearance, and quality

Transaera logo

Transaera

Infrastructure & Construction

Ultra-efficient air conditioning using a novel desiccant material

Raise Green logo

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 logo

Energiency

Manufacturing & Processing

Biobot Analytics logo

Biobot Analytics

Food, Water, & Land

Skylark Wireless logo

Skylark Wireless

Manufacturing & Processing

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

Sunwealth logo

Sunwealth

Energy & Power

Arista Solutions logo

Arista Solutions

Upstream Tech logo

Upstream Tech

Energy & Power

Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts

COI Energy logo

COI Energy

Energy & Power

AI and machine learning to predict and prevent energy waste

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

Blue Line Battery logo

Blue Line Battery

Energy & Power

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

AquaNRG logo

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 logo

Peak Power

Energy & Power

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

Axis Sky Renewables logo

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 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.

Mission Zero Technologies logo

Mission Zero Technologies

Manufacturing & Processing

Efficient electrochemistry to capture CO₂

Singularity Energy logo

Singularity Energy

Energy & Power

Data and software solutions for grid decarbonization

Dugu Systems logo

Dugu Systems

Energy & Power

Zero-carbon power with an emissions-free gas turbine

Mitico logo

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 logo

Hygen

Energy & Power

Transaera logo

Transaera

Infrastructure & Construction

Ultra-efficient air conditioning using a novel desiccant material

Raise Green logo

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 logo

Energiency

Manufacturing & Processing

Biobot Analytics logo

Biobot Analytics

Food, Water, & Land

Skylark Wireless logo

Skylark Wireless

Manufacturing & Processing

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

Sunwealth logo

Sunwealth

Energy & Power

Arista Solutions logo

Arista Solutions

Upstream Tech logo

Upstream Tech

Energy & Power

Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts

COI Energy logo

COI Energy

Energy & Power

AI and machine learning to predict and prevent energy waste

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

Blue Line Battery logo

Blue Line Battery

Energy & Power

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

AquaNRG logo

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 logo

Peak Power

Energy & Power

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

Axis Sky Renewables logo

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 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.

Mission Zero Technologies logo

Mission Zero Technologies

Manufacturing & Processing

Efficient electrochemistry to capture CO₂

Singularity Energy logo

Singularity Energy

Energy & Power

Data and software solutions for grid decarbonization

Dugu Systems logo

Dugu Systems

Energy & Power

Zero-carbon power with an emissions-free gas turbine

Mitico logo

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 logo

Hygen

Energy & Power

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