Helping climatetech startupsTransformindustry faster

Advent Technologies
Energy & Power
Advent Technologies — makes ht-pem fuel cells that convert hydrogen and other renewable fuels to electricity. This platform technology that addresses needs in numerous markets, including passenger, commercial vehicle, and lightweight aviation (eVTOL).

Stepwise
Energy & Power
Stepwise — makes home electrification effortless and affordable by reducing the infrastructure upgrades costs associated with installations and helping homeowners save money on their electricity bills through energy management.

sweetgreen
Food, Water, & Land

VentureWell

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.

Polymer-X
Manufacturing & Processing

Prime Lightworks
Energy & Power
Prime Lightworks — makes breakthrough electric propulsion systems for space satellites that are solar-powered, fully renewable, and consume zero fuel. The company’s goal is to eliminate fuel emissions from space propulsion while drastically reducing cost and waste.

GeoFuels
Energy & Power
We are positioned to solve the problem of clean hydrogen not competing economically against alternatives. Through geothermal power and methane pyrolysis we believe we have the solution.

CarbonBlue
Food, Water, & Land

CarbonQuest
Infrastructure & Construction

Nexus Circular
Manufacturing & Processing

Phytoform Labs
Food, Water, & Land
Phytoform Labs — has a crop development platform that uses cutting-edge machine learning and genome editing technologies to explore and evolve the natural genetic sequences of plants.

Return To Vendor
Manufacturing & Processing

Energetic Insurance
Energy & Power
Unlocking solar financing for unrated or below investment grade organizations.

SeaDeep
Transportation & Logistics
SeaDeep — revolutionizes underwater assessments with AI-powered subsea vision for inspecting marine environments and substructures in real-time and with high-fidelity using low-cost, off-the-shelf cameras.

RightHand Robotics
Transportation & Logistics

Invested Development
Food, Water, & Land

Searover Robotics and Software
Manufacturing & Processing

CarbonFree
Manufacturing & Processing

Voltaware
Energy & Power
Voltaware is an AI-powered energy intelligence company that helps utilities, energy innovators, and service providers unlock the full potential of energy data to drive energy efficiency and decarbonization.

Advent Technologies
Energy & Power
Advent Technologies — makes ht-pem fuel cells that convert hydrogen and other renewable fuels to electricity. This platform technology that addresses needs in numerous markets, including passenger, commercial vehicle, and lightweight aviation (eVTOL).

Stepwise
Energy & Power
Stepwise — makes home electrification effortless and affordable by reducing the infrastructure upgrades costs associated with installations and helping homeowners save money on their electricity bills through energy management.

sweetgreen
Food, Water, & Land

VentureWell

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.

Polymer-X
Manufacturing & Processing

Prime Lightworks
Energy & Power
Prime Lightworks — makes breakthrough electric propulsion systems for space satellites that are solar-powered, fully renewable, and consume zero fuel. The company’s goal is to eliminate fuel emissions from space propulsion while drastically reducing cost and waste.

GeoFuels
Energy & Power
We are positioned to solve the problem of clean hydrogen not competing economically against alternatives. Through geothermal power and methane pyrolysis we believe we have the solution.

CarbonBlue
Food, Water, & Land

CarbonQuest
Infrastructure & Construction

Nexus Circular
Manufacturing & Processing

Phytoform Labs
Food, Water, & Land
Phytoform Labs — has a crop development platform that uses cutting-edge machine learning and genome editing technologies to explore and evolve the natural genetic sequences of plants.

Return To Vendor
Manufacturing & Processing

Energetic Insurance
Energy & Power
Unlocking solar financing for unrated or below investment grade organizations.

SeaDeep
Transportation & Logistics
SeaDeep — revolutionizes underwater assessments with AI-powered subsea vision for inspecting marine environments and substructures in real-time and with high-fidelity using low-cost, off-the-shelf cameras.

RightHand Robotics
Transportation & Logistics

Invested Development
Food, Water, & Land

Searover Robotics and Software
Manufacturing & Processing

CarbonFree
Manufacturing & Processing

Voltaware
Energy & Power
Voltaware is an AI-powered energy intelligence company that helps utilities, energy innovators, and service providers unlock the full potential of energy data to drive energy efficiency and decarbonization.

MicroEra Power
Energy & Power
MicroEra Power — develops and manufactures THERMAplus, a hardware + software solution for smart Thermal Energy Storage for buildings.

Renewell Energy
Energy & Power
Gravitational energy storage

Public Grid
Energy & Power

ZwitterCo
Food, Water, & Land
Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Future
Future — simplifies the transition to a net-zero economy for individuals and families. Future offers a set of financial tools and incentives for climate smart living. Future takes a 360°view of spending and generates individualized options to save money and reduce carbon emissions with their decision-engine.

Quantum Diamond Technologies
Manufacturing & Processing

SWTCH Energy Inc.
Transportation & Logistics

Appollo Wind Technologies
Infrastructure & Construction

Energy Well Texas
Energy & Power
Our mission is to strengthen communities by helping millions of people switch to fairer, more resilient, 100% clean energy.

Planetary Hydrogen
Manufacturing & Processing

TORO Water Air Thermal Technologies Corp.
Energy & Power

Texas Geothermal Energy Alliance
Energy & Power

Ecolectro
Manufacturing & Processing

InfiSense

Energy Toolbase
Energy & Power
Energy Toolbase — is an industry leading software platform that provides a cohesive suite of project modeling, energy storage control and asset monitoring products that enable solar and energy storage developers to deploy projects more efficiently.

Made of Air
Manufacturing & Processing

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.

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.

WindRays Energy LLC
Energy & Power
WindRays Energy LLC — develops new models of wind energy designs to make widespread implementation in densely populated areas more efficient and profitable.

Circe Bioscience
Food, Water, & Land
Circe Industries circularizes industries with cellular factories.

MicroEra Power
Energy & Power
MicroEra Power — develops and manufactures THERMAplus, a hardware + software solution for smart Thermal Energy Storage for buildings.

Renewell Energy
Energy & Power
Gravitational energy storage

Public Grid
Energy & Power

ZwitterCo
Food, Water, & Land
Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Future
Future — simplifies the transition to a net-zero economy for individuals and families. Future offers a set of financial tools and incentives for climate smart living. Future takes a 360°view of spending and generates individualized options to save money and reduce carbon emissions with their decision-engine.

Quantum Diamond Technologies
Manufacturing & Processing

SWTCH Energy Inc.
Transportation & Logistics

Appollo Wind Technologies
Infrastructure & Construction

Energy Well Texas
Energy & Power
Our mission is to strengthen communities by helping millions of people switch to fairer, more resilient, 100% clean energy.

Planetary Hydrogen
Manufacturing & Processing

TORO Water Air Thermal Technologies Corp.
Energy & Power

Texas Geothermal Energy Alliance
Energy & Power

Ecolectro
Manufacturing & Processing

InfiSense

Energy Toolbase
Energy & Power
Energy Toolbase — is an industry leading software platform that provides a cohesive suite of project modeling, energy storage control and asset monitoring products that enable solar and energy storage developers to deploy projects more efficiently.

Made of Air
Manufacturing & Processing

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.

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.

WindRays Energy LLC
Energy & Power
WindRays Energy LLC — develops new models of wind energy designs to make widespread implementation in densely populated areas more efficient and profitable.

Circe Bioscience
Food, Water, & Land
Circe Industries circularizes industries with cellular factories.




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.






















