Helping climatetech startupsTransformindustry faster

Julius Education
Infrastructure & Construction
Helping green organizations manage the changing workforce through an experience platform for job-seekers

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

PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen

Capture6
Manufacturing & Processing
Capture6 — removes carbon from the atmosphere while producing clean water and other industrial products from seawater or other saltwater inputs.

GreenIRR
Transportation & Logistics

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.

WattSto Energy
Energy & Power
We are a leading manufacturer of Long Duration Energy Storage (LDES) and Unique Hybrid Design System, providing Fast, Long Duration, Safe, Sustainable, and Cost-effective energy storage solutions at the microgrid and grid levels. Our innovative technology accelerates the integration of renewable energy, reduces carbon emissions, and provides power for a cleaner future.

Open Ocean Robotics
Energy & Power

Black Mountain Metals
Manufacturing & Processing
Black Mountain Metals is a global battery metals mining company, specifically focused on sustainable nickel and copper mining for lithium ion battery cathodes.

Allkemie
Manufacturing & Processing
Producing tailored graphene and other nanomaterials at scale

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Lignium Energy
Energy & Power
Lignium Energy — transforms cow manure into combustion pellets, generating a certified and odorless product with a high calorific power that complies with all the regulations to be used.

Solidec
Manufacturing & Processing
Using air, water, and electricity, Solidec generates the world's most essential chemicals, on-site and on-demand.

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.

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

SnoFox Sciences
Transportation & Logistics
SnoFox Sciences — is developing a platform that provides actionable insights such as fault classification and predictive maintenance recommendations to the operators and stakeholders responsible for the performance and reliability of refrigerated spaces.

Canetia Analytics
Transportation & Logistics
Canetia Analytics — monitors structures and their natural vibration signature through IoT, artificial intelligence and machine learning to enable a building to be seen from the inside to the outside, continuously and automatically.

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.

Littoral Power Systems
Energy & Power
LPS sells and maintains innovative, cost-effective, low impact hydropower and ocean power equipment.

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.

Julius Education
Infrastructure & Construction
Helping green organizations manage the changing workforce through an experience platform for job-seekers

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

PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen

Capture6
Manufacturing & Processing
Capture6 — removes carbon from the atmosphere while producing clean water and other industrial products from seawater or other saltwater inputs.

GreenIRR
Transportation & Logistics

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.

WattSto Energy
Energy & Power
We are a leading manufacturer of Long Duration Energy Storage (LDES) and Unique Hybrid Design System, providing Fast, Long Duration, Safe, Sustainable, and Cost-effective energy storage solutions at the microgrid and grid levels. Our innovative technology accelerates the integration of renewable energy, reduces carbon emissions, and provides power for a cleaner future.

Open Ocean Robotics
Energy & Power

Black Mountain Metals
Manufacturing & Processing
Black Mountain Metals is a global battery metals mining company, specifically focused on sustainable nickel and copper mining for lithium ion battery cathodes.

Allkemie
Manufacturing & Processing
Producing tailored graphene and other nanomaterials at scale

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Lignium Energy
Energy & Power
Lignium Energy — transforms cow manure into combustion pellets, generating a certified and odorless product with a high calorific power that complies with all the regulations to be used.

Solidec
Manufacturing & Processing
Using air, water, and electricity, Solidec generates the world's most essential chemicals, on-site and on-demand.

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.

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

SnoFox Sciences
Transportation & Logistics
SnoFox Sciences — is developing a platform that provides actionable insights such as fault classification and predictive maintenance recommendations to the operators and stakeholders responsible for the performance and reliability of refrigerated spaces.

Canetia Analytics
Transportation & Logistics
Canetia Analytics — monitors structures and their natural vibration signature through IoT, artificial intelligence and machine learning to enable a building to be seen from the inside to the outside, continuously and automatically.

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.

Littoral Power Systems
Energy & Power
LPS sells and maintains innovative, cost-effective, low impact hydropower and ocean power equipment.

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.

change:WATER Labs
Food, Water, & Land
Low-cost, compact, waterless toilet for non-sewered households and communities

Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization

Suyana Climate Insurance

Carbonbase

Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency

WIP International Services
Food, Water, & Land
WIP International Services LLC — works with partners around the world to deliver a renewable source of pure drinking water

CemCycle
Manufacturing & Processing

BlakBear
Food, Water, & Land

Community Energy Labs
Infrastructure & Construction

Wise Energie
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power

WattGlass
Energy & Power

Intention
Energy & Power
Climate-infrastructure-investment platform

IncentiFind
Infrastructure & Construction

Nexus Circular
Manufacturing & Processing

Energy Dome
Energy & Power
EnergyDome — has ideated and patented a revolutionary technology for large-scale and long-duration energy storage: The CO2 Battery.

Electric Fish
Energy & Power
Electric Fish — deploys NanoGrids at gas-stations for extreme-fast EV charging, and grid-scale energy-backup.

PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor

SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power

Appollo Wind Technologies
Infrastructure & Construction

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

change:WATER Labs
Food, Water, & Land
Low-cost, compact, waterless toilet for non-sewered households and communities

Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization

Suyana Climate Insurance

Carbonbase

Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency

WIP International Services
Food, Water, & Land
WIP International Services LLC — works with partners around the world to deliver a renewable source of pure drinking water

CemCycle
Manufacturing & Processing

BlakBear
Food, Water, & Land

Community Energy Labs
Infrastructure & Construction

Wise Energie
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power

WattGlass
Energy & Power

Intention
Energy & Power
Climate-infrastructure-investment platform

IncentiFind
Infrastructure & Construction

Nexus Circular
Manufacturing & Processing

Energy Dome
Energy & Power
EnergyDome — has ideated and patented a revolutionary technology for large-scale and long-duration energy storage: The CO2 Battery.

Electric Fish
Energy & Power
Electric Fish — deploys NanoGrids at gas-stations for extreme-fast EV charging, and grid-scale energy-backup.

PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor

SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power

Appollo Wind Technologies
Infrastructure & Construction

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




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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Countries Where
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.






















