Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
Advent Technologies logo

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 logo

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 logo

sweetgreen

Food, Water, & Land

VentureWell logo

VentureWell

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.

Polymer-X logo

Polymer-X

Manufacturing & Processing

Prime Lightworks logo

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 logo

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 logo

CarbonBlue

Food, Water, & Land

CarbonQuest logo

CarbonQuest

Infrastructure & Construction

Nexus Circular logo

Nexus Circular

Manufacturing & Processing

Phytoform Labs logo

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 logo

Return To Vendor

Manufacturing & Processing

Energetic Insurance logo

Energetic Insurance

Energy & Power

Unlocking solar financing for unrated or below investment grade organizations.

SeaDeep logo

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 logo

RightHand Robotics

Transportation & Logistics

Invested Development logo

Invested Development

Food, Water, & Land

Searover Robotics and Software logo

Searover Robotics and Software

Manufacturing & Processing

CarbonFree logo

CarbonFree

Manufacturing & Processing

Voltaware logo

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 logo

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 logo

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 logo

sweetgreen

Food, Water, & Land

VentureWell logo

VentureWell

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.

Polymer-X logo

Polymer-X

Manufacturing & Processing

Prime Lightworks logo

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 logo

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 logo

CarbonBlue

Food, Water, & Land

CarbonQuest logo

CarbonQuest

Infrastructure & Construction

Nexus Circular logo

Nexus Circular

Manufacturing & Processing

Phytoform Labs logo

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 logo

Return To Vendor

Manufacturing & Processing

Energetic Insurance logo

Energetic Insurance

Energy & Power

Unlocking solar financing for unrated or below investment grade organizations.

SeaDeep logo

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 logo

RightHand Robotics

Transportation & Logistics

Invested Development logo

Invested Development

Food, Water, & Land

Searover Robotics and Software logo

Searover Robotics and Software

Manufacturing & Processing

CarbonFree logo

CarbonFree

Manufacturing & Processing

Voltaware logo

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 logo

MicroEra Power

Energy & Power

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

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

Public Grid logo

Public Grid

Energy & Power

ZwitterCo logo

ZwitterCo

Food, Water, & Land

Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Future logo

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 logo

Quantum Diamond Technologies

Manufacturing & Processing

SWTCH Energy Inc. logo

SWTCH Energy Inc.

Transportation & Logistics

Appollo Wind Technologies logo

Appollo Wind Technologies

Infrastructure & Construction

Energy Well Texas logo

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 logo

Planetary Hydrogen

Manufacturing & Processing

TORO Water Air Thermal Technologies Corp. logo

TORO Water Air Thermal Technologies Corp.

Energy & Power

Texas Geothermal Energy Alliance logo

Texas Geothermal Energy Alliance

Energy & Power

Ecolectro logo

Ecolectro

Manufacturing & Processing

InfiSense logo

InfiSense

Energy Toolbase logo

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 logo

Made of Air

Manufacturing & Processing

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.

Black Mountain Metals logo

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 logo

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 logo

Circe Bioscience

Food, Water, & Land

Circe Industries circularizes industries with cellular factories.

MicroEra Power logo

MicroEra Power

Energy & Power

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

Renewell Energy logo

Renewell Energy

Energy & Power

Gravitational energy storage

Public Grid logo

Public Grid

Energy & Power

ZwitterCo logo

ZwitterCo

Food, Water, & Land

Nanofiltration membranes for wastewater treatment with unprecedented fouling-resistance and size-selectivity.

Future logo

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 logo

Quantum Diamond Technologies

Manufacturing & Processing

SWTCH Energy Inc. logo

SWTCH Energy Inc.

Transportation & Logistics

Appollo Wind Technologies logo

Appollo Wind Technologies

Infrastructure & Construction

Energy Well Texas logo

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 logo

Planetary Hydrogen

Manufacturing & Processing

TORO Water Air Thermal Technologies Corp. logo

TORO Water Air Thermal Technologies Corp.

Energy & Power

Texas Geothermal Energy Alliance logo

Texas Geothermal Energy Alliance

Energy & Power

Ecolectro logo

Ecolectro

Manufacturing & Processing

InfiSense logo

InfiSense

Energy Toolbase logo

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 logo

Made of Air

Manufacturing & Processing

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.

Black Mountain Metals logo

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 logo

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 logo

Circe Bioscience

Food, Water, & Land

Circe Industries circularizes industries with cellular factories.

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