Helping climatetech startupsTransformindustry faster

Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen

Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials

Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably

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.

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.

Feon Energy, Inc. (eLyte Technology)
Energy & Power
eLyte — is commercializing next-gen battery technology for electric vehicles and other applications.

Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors

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

Bodhi
Energy & Power
Bodhi — cultivates the bond between people and the energy that powers their lives. The company’s software platform empowers solar companies to deliver amazing customer experiences with ease. Bodhi automates communication and personalizes the homeowners’ experience, so that installers can focus on what they do best – executing projects, making more sales, and transforming communities around energy.

Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen

Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains

Applied Bioplastics
Food, Water, & Land
Applied Bioplastics — is commercializing plant-based polymers that are far healthier and more sustainable, at competitive pricing to their petrochemical-based analogues

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

Moment Energy
Energy & Power

rStream
Manufacturing & Processing
Autonomous waste-sorting system for non-industrial settings with critical waste volumes

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.

Forty Acres Consulting
Transportation & Logistics
Forty Acres Consulting — consults for both large Fortune 500 companies and startups big and small. They specialize in scaling, supply chain, logistics, business development and healthcare.

Ohmium International
Energy & Power

ETAK
ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.

Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile

Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen

Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials

Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably

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.

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.

Feon Energy, Inc. (eLyte Technology)
Energy & Power
eLyte — is commercializing next-gen battery technology for electric vehicles and other applications.

Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors

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

Bodhi
Energy & Power
Bodhi — cultivates the bond between people and the energy that powers their lives. The company’s software platform empowers solar companies to deliver amazing customer experiences with ease. Bodhi automates communication and personalizes the homeowners’ experience, so that installers can focus on what they do best – executing projects, making more sales, and transforming communities around energy.

Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen

Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains

Applied Bioplastics
Food, Water, & Land
Applied Bioplastics — is commercializing plant-based polymers that are far healthier and more sustainable, at competitive pricing to their petrochemical-based analogues

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

Moment Energy
Energy & Power

rStream
Manufacturing & Processing
Autonomous waste-sorting system for non-industrial settings with critical waste volumes

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.

Forty Acres Consulting
Transportation & Logistics
Forty Acres Consulting — consults for both large Fortune 500 companies and startups big and small. They specialize in scaling, supply chain, logistics, business development and healthcare.

Ohmium International
Energy & Power

ETAK
ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.

Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile

Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices

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.

Oxylus Energy
Transportation & Logistics

Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities

REI
Energy & Power

Cala Systems
Energy & Power
Intelligent heat-pump water heaters

Circularise
Manufacturing & Processing

Wastewizer Technologies
Transportation & Logistics
Wastewizer Technologies — builds internet-connected rugged scales that continuously monitor the weight of containers through their BinBar™ system; with this technology, they empower the waste industry by providing actionable insights for improving sustainability, economic efficiency, and customer satisfaction.

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

LiftOFF Technology
Energy & Power
Batteries with breakthrough energy density and safety

SolarFi
Energy & Power
Privé is a unique and blissful experience for social-distanced gathering in a transparent house that combines the arts, renewable energy, and sustainability.

RailPod
Transportation & Logistics

Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes

Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC

MicroAvionics
Transportation & Logistics

SteamIQ
Manufacturing & Processing

SEEDiA
Energy & Power
SEEDiA — is making cities sustainable by reducing CO2 emissions and keeping citizen connected and charged up.

Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption

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

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

Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices

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.

Oxylus Energy
Transportation & Logistics

Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities

REI
Energy & Power

Cala Systems
Energy & Power
Intelligent heat-pump water heaters

Circularise
Manufacturing & Processing

Wastewizer Technologies
Transportation & Logistics
Wastewizer Technologies — builds internet-connected rugged scales that continuously monitor the weight of containers through their BinBar™ system; with this technology, they empower the waste industry by providing actionable insights for improving sustainability, economic efficiency, and customer satisfaction.

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

LiftOFF Technology
Energy & Power
Batteries with breakthrough energy density and safety

SolarFi
Energy & Power
Privé is a unique and blissful experience for social-distanced gathering in a transparent house that combines the arts, renewable energy, and sustainability.

RailPod
Transportation & Logistics

Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes

Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC

MicroAvionics
Transportation & Logistics

SteamIQ
Manufacturing & Processing

SEEDiA
Energy & Power
SEEDiA — is making cities sustainable by reducing CO2 emissions and keeping citizen connected and charged up.

Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption

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

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




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
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