Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
JURA Bio logo

JURA Bio

Food, Water, & Land

Criaterra logo

Criaterra

Clarity Castle logo

Clarity Castle

Infrastructure & Construction

Modular, soundproof work pods made from recycled materials

Altitude logo

Altitude

Altitude (subsidiary of Accenture) — is a privately held product design and innovation firm based in Boston that uses its expertise in consumer insight, design and product engineering to help companies innovate and develop new physical products and services.

Visolis logo

Visolis

Infrastructure & Construction

CarTwin logo

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.

Clean Crop Technologies logo

Clean Crop Technologies

Food, Water, & Land

Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

Biobot Analytics logo

Biobot Analytics

Food, Water, & Land

QD Solar logo

QD Solar

Energy & Power

Regenerative Resources logo

Regenerative Resources

Food, Water, & Land

Regenerative Resources — is an ecosystems services company that acquires highly-degraded land and transforms it in order to reuse it for aquaculture.

Celadyne logo

Celadyne

Energy & Power

Altaeros logo

Altaeros

Energy & Power

Euphree logo

Euphree

Transportation & Logistics

Electric bikes made fashionable.

Rushnu logo

Rushnu

Manufacturing & Processing

Turns waste into carbon-neutral chemistry

Decimetrix logo

Decimetrix

Energy & Power

AI platform to help clients measure their carbon footprint

Patch logo

Patch

Transportation & Logistics

Global ROC logo

Global ROC

Food, Water, & Land

Global ROC — provides an innovative technology solution for cooling tower systems that reduces chemical consumption, saves water, and decreases energy costs.

Stash Energy logo

Stash Energy

Energy & Power

Stash Energy makes home heating and cooling affordable and sustainable with the first smart heat pump with built-in thermal energy storage.

Loop CO2 logo

Loop CO2

Manufacturing & Processing

Transforming CO₂ into sustainable polymers to create fully recyclable materials

RailState logo

RailState

Transportation & Logistics

RailState — answers an increasing demand among freight customers, commodity traders, financial analysts, and government agencies for more current and granular visibility on railway volumes, performance, and condition.

JURA Bio logo

JURA Bio

Food, Water, & Land

Criaterra logo

Criaterra

Clarity Castle logo

Clarity Castle

Infrastructure & Construction

Modular, soundproof work pods made from recycled materials

Altitude logo

Altitude

Altitude (subsidiary of Accenture) — is a privately held product design and innovation firm based in Boston that uses its expertise in consumer insight, design and product engineering to help companies innovate and develop new physical products and services.

Visolis logo

Visolis

Infrastructure & Construction

CarTwin logo

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.

Clean Crop Technologies logo

Clean Crop Technologies

Food, Water, & Land

Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

Biobot Analytics logo

Biobot Analytics

Food, Water, & Land

QD Solar logo

QD Solar

Energy & Power

Regenerative Resources logo

Regenerative Resources

Food, Water, & Land

Regenerative Resources — is an ecosystems services company that acquires highly-degraded land and transforms it in order to reuse it for aquaculture.

Celadyne logo

Celadyne

Energy & Power

Altaeros logo

Altaeros

Energy & Power

Euphree logo

Euphree

Transportation & Logistics

Electric bikes made fashionable.

Rushnu logo

Rushnu

Manufacturing & Processing

Turns waste into carbon-neutral chemistry

Decimetrix logo

Decimetrix

Energy & Power

AI platform to help clients measure their carbon footprint

Patch logo

Patch

Transportation & Logistics

Global ROC logo

Global ROC

Food, Water, & Land

Global ROC — provides an innovative technology solution for cooling tower systems that reduces chemical consumption, saves water, and decreases energy costs.

Stash Energy logo

Stash Energy

Energy & Power

Stash Energy makes home heating and cooling affordable and sustainable with the first smart heat pump with built-in thermal energy storage.

Loop CO2 logo

Loop CO2

Manufacturing & Processing

Transforming CO₂ into sustainable polymers to create fully recyclable materials

RailState logo

RailState

Transportation & Logistics

RailState — answers an increasing demand among freight customers, commodity traders, financial analysts, and government agencies for more current and granular visibility on railway volumes, performance, and condition.

Dsider logo

Dsider

Energy & Power

SaaS platform to accelerate the expansion of energy-transition projects

Accion Systems logo

Accion Systems

Transportation & Logistics

Accion Systems — develops in-space propulsion technologies that optimize scalability, performance, and efficiency to accelerate the exploration of space. Accion’s flagship product, TILE, uses proprietary electrospray thrusters, bringing electric propulsion to satellites of all sizes and redefining in-space capabilities for the 21st century.

SkyH2O logo

SkyH2O

Food, Water, & Land

Atmospheric water generation for commercial and government projects

enaDyne logo

enaDyne

Manufacturing & Processing

enaDyne — develops non-thermal plasma catalysis reactors to convert CO2 into chemicals and fuels.

CZAR Power logo

CZAR Power

Energy & Power

Ocean Visuals logo

Ocean Visuals

Food, Water, & Land

Patented hyper-spectral LiDAR for real-time detection of oil and organics

Cellsense logo

Cellsense

Manufacturing & Processing

MoveEV logo

MoveEV

Transportation & Logistics

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

Ardent Process Technologies logo

Ardent Process Technologies

Energy & Power

VentureWell logo

VentureWell

Carbonext logo

Carbonext

Manufacturing & Processing

3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes

GreenLabs Recycling logo

GreenLabs Recycling

Manufacturing & Processing

Sistine Solar logo

Sistine Solar

Energy & Power

Sistine Solar — creates SolarSkin, an aesthetic overlay that transforms the look of any solar panel. It can make the panel blend in with a homeowner’s roof—no matter what color, pattern, or style.

Manatee Energy logo

Manatee Energy

Infrastructure & Construction

Rigorous and automated system design for affordable home heat pumps

Armeta logo

Armeta

Armeta AI is the structured data layer for industrial facilities, turning legacy P&IDs into Material Take-Offs and EPA/OSHA regulatory inventories that power brownfield retrofits, LDAR programs, and energy transition projects across the installed base.

NeuroBionics logo

NeuroBionics

Manufacturing & Processing

Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation

Carbon Negative Solutions logo

Carbon Negative Solutions

Infrastructure & Construction

Realizse logo

Realizse

Energy & Power

Tokenization and product verification for circularity, energy, and the real estate markets

Thiozen logo

Thiozen

Manufacturing & Processing

Chemical waste-to-hydrogen cycle that removes hydrogen sulfide from gas streams and generates zero-emission hydrogen

SRGE logo

SRGE

Infrastructure & Construction

Full-service accelerator to support small and underrepresented-led construction firms

Dsider logo

Dsider

Energy & Power

SaaS platform to accelerate the expansion of energy-transition projects

Accion Systems logo

Accion Systems

Transportation & Logistics

Accion Systems — develops in-space propulsion technologies that optimize scalability, performance, and efficiency to accelerate the exploration of space. Accion’s flagship product, TILE, uses proprietary electrospray thrusters, bringing electric propulsion to satellites of all sizes and redefining in-space capabilities for the 21st century.

SkyH2O logo

SkyH2O

Food, Water, & Land

Atmospheric water generation for commercial and government projects

enaDyne logo

enaDyne

Manufacturing & Processing

enaDyne — develops non-thermal plasma catalysis reactors to convert CO2 into chemicals and fuels.

CZAR Power logo

CZAR Power

Energy & Power

Ocean Visuals logo

Ocean Visuals

Food, Water, & Land

Patented hyper-spectral LiDAR for real-time detection of oil and organics

Cellsense logo

Cellsense

Manufacturing & Processing

MoveEV logo

MoveEV

Transportation & Logistics

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

Ardent Process Technologies logo

Ardent Process Technologies

Energy & Power

VentureWell logo

VentureWell

Carbonext logo

Carbonext

Manufacturing & Processing

3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes

GreenLabs Recycling logo

GreenLabs Recycling

Manufacturing & Processing

Sistine Solar logo

Sistine Solar

Energy & Power

Sistine Solar — creates SolarSkin, an aesthetic overlay that transforms the look of any solar panel. It can make the panel blend in with a homeowner’s roof—no matter what color, pattern, or style.

Manatee Energy logo

Manatee Energy

Infrastructure & Construction

Rigorous and automated system design for affordable home heat pumps

Armeta logo

Armeta

Armeta AI is the structured data layer for industrial facilities, turning legacy P&IDs into Material Take-Offs and EPA/OSHA regulatory inventories that power brownfield retrofits, LDAR programs, and energy transition projects across the installed base.

NeuroBionics logo

NeuroBionics

Manufacturing & Processing

Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation

Carbon Negative Solutions logo

Carbon Negative Solutions

Infrastructure & Construction

Realizse logo

Realizse

Energy & Power

Tokenization and product verification for circularity, energy, and the real estate markets

Thiozen logo

Thiozen

Manufacturing & Processing

Chemical waste-to-hydrogen cycle that removes hydrogen sulfide from gas streams and generates zero-emission hydrogen

SRGE logo

SRGE

Infrastructure & Construction

Full-service accelerator to support small and underrepresented-led construction firms

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