Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
American Battery Technology Company logo

American Battery Technology Company

Energy & Power

Advanced technology, first-mover lithium-ion battery recycling and primary battery metal extraction company

String Data Motion logo

String Data Motion

Infrastructure & Construction

Agentic AI for energy companies. Agents in motion. Outcomes delivered.

CZAR Power logo

CZAR Power

Energy & Power

Nth Cycle logo

Nth Cycle

Manufacturing & Processing

Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings

INpower logo

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.

SEEDiA logo

SEEDiA

Energy & Power

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

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

Priority Investor Loans logo

Priority Investor Loans

Infrastructure & Construction

Simplified loan programs to fund real estate investors nationwide with income-producing properties

DrinKicks logo

DrinKicks

Food, Water, & Land

Repurposing food waste and recycled materials into shoes

SteamIQ logo

SteamIQ

Manufacturing & Processing

HyperKelp logo

HyperKelp

Food, Water, & Land

HyperKelp — produces the Kelp Smart Buoy—a hosted payload platform capable of carrying hundreds of sensors—that collects and transmits marine-level data for wind farmers, climate scientists, and military intelligence officials.

Energiency logo

Energiency

Manufacturing & Processing

Stork, a Fluor Company logo

Stork, a Fluor Company

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.

Thalon Materials logo

Thalon Materials

Circe Bioscience logo

Circe Bioscience

Food, Water, & Land

Circe Industries circularizes industries with cellular factories.

Skyre logo

Skyre

Manufacturing & Processing

SpringCycle Energy logo

SpringCycle Energy

Energy & Power

Rechargeable iron fuel to transform solar into baseload power

Understory logo

Understory

Infrastructure & Construction

Weather hardware and analytics

Electric Fish logo

Electric Fish

Energy & Power

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

American Battery Technology Company logo

American Battery Technology Company

Energy & Power

Advanced technology, first-mover lithium-ion battery recycling and primary battery metal extraction company

String Data Motion logo

String Data Motion

Infrastructure & Construction

Agentic AI for energy companies. Agents in motion. Outcomes delivered.

CZAR Power logo

CZAR Power

Energy & Power

Nth Cycle logo

Nth Cycle

Manufacturing & Processing

Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings

INpower logo

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.

SEEDiA logo

SEEDiA

Energy & Power

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

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

Priority Investor Loans logo

Priority Investor Loans

Infrastructure & Construction

Simplified loan programs to fund real estate investors nationwide with income-producing properties

DrinKicks logo

DrinKicks

Food, Water, & Land

Repurposing food waste and recycled materials into shoes

SteamIQ logo

SteamIQ

Manufacturing & Processing

HyperKelp logo

HyperKelp

Food, Water, & Land

HyperKelp — produces the Kelp Smart Buoy—a hosted payload platform capable of carrying hundreds of sensors—that collects and transmits marine-level data for wind farmers, climate scientists, and military intelligence officials.

Energiency logo

Energiency

Manufacturing & Processing

Stork, a Fluor Company logo

Stork, a Fluor Company

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.

Thalon Materials logo

Thalon Materials

Circe Bioscience logo

Circe Bioscience

Food, Water, & Land

Circe Industries circularizes industries with cellular factories.

Skyre logo

Skyre

Manufacturing & Processing

SpringCycle Energy logo

SpringCycle Energy

Energy & Power

Rechargeable iron fuel to transform solar into baseload power

Understory logo

Understory

Infrastructure & Construction

Weather hardware and analytics

Electric Fish logo

Electric Fish

Energy & Power

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

Soliyarn logo

Soliyarn

Manufacturing & Processing

Soliyarn — employs a unique (dry) process to vapor coat polymers on textiles, which leads to washable electronic clothing without wires or bulk.

Invested Development logo

Invested Development

Food, Water, & Land

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.

Active Surfaces logo

Active Surfaces

Energy & Power

Flexible, lightweight solar panels that turn any surface into solar

AdaViv logo

AdaViv

Food, Water, & Land

Hardware-enabled crop-care software for greenhouse and indoor growers to maximize quality yields without added labor

Transaera logo

Transaera

Infrastructure & Construction

Ultra-efficient air conditioning using a novel desiccant material

Torres Orbital Mining Inc (TOM) logo

Torres Orbital Mining Inc (TOM)

Infrastructure & Construction

Autonomous lunar excavation systems for dust-free regolith mining and space operations

STEM Americas Foundation logo

STEM Americas Foundation

MagDrive Technologies Inc. logo

MagDrive Technologies Inc.

Manufacturing & Processing

Eliminating fugitive emissions and delivering zero-leak performance and durability

COI Energy logo

COI Energy

Energy & Power

AI and machine learning to predict and prevent energy waste

CrowdComfort logo

CrowdComfort

Infrastructure & Construction

Prophet AI logo

Prophet AI

Food, Water, & Land

AI-based poultry-health-monitoring system to reduce chicken mortality, save revenue, and avoid carbon emissions

PolyQor (Innova8e) logo

PolyQor (Innova8e)

Manufacturing & Processing

Concept Loop is dedicated to repurposing low-value post-industrial and post-consumer plastic waste into sustainable building materials. Our flagship product, EcoGrete, is used in the production of high-strength paver blocks and tiles, offering an eco-friendly solution while reducing environmental impact.

Biosfera logo

Biosfera

Manufacturing & Processing

Via Separations logo

Via Separations

Manufacturing & Processing

Via Separations — is developing a new membrane material to make manufacturing processes more energy efficient—transforming the production of things like fertilizer and nylon, and with the potential to save a gigaton of carbon each year.

Zero Homes logo

Zero Homes

Infrastructure & Construction

Automated assessment, design, and procurement platform for residential building retrofits

Top Grain Technologies logo

Top Grain Technologies

Energy & Power

Top Grain Technologies — is commercializing a scalable high-throughput heat treatment solution that imparts a directionally solidified grain structure to additively manufactured (AM) Ni-base superalloys, enabling their use in the most demanding high-temperature applications, from combustion turbines to rocket engines

Massachusetts Climatetech Studio logo

Massachusetts Climatetech Studio

Energy & Power

MicroEra Power logo

MicroEra Power

Energy & Power

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

Starfire Energy logo

Starfire Energy

Energy & Power

Soliyarn logo

Soliyarn

Manufacturing & Processing

Soliyarn — employs a unique (dry) process to vapor coat polymers on textiles, which leads to washable electronic clothing without wires or bulk.

Invested Development logo

Invested Development

Food, Water, & Land

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.

Active Surfaces logo

Active Surfaces

Energy & Power

Flexible, lightweight solar panels that turn any surface into solar

AdaViv logo

AdaViv

Food, Water, & Land

Hardware-enabled crop-care software for greenhouse and indoor growers to maximize quality yields without added labor

Transaera logo

Transaera

Infrastructure & Construction

Ultra-efficient air conditioning using a novel desiccant material

Torres Orbital Mining Inc (TOM) logo

Torres Orbital Mining Inc (TOM)

Infrastructure & Construction

Autonomous lunar excavation systems for dust-free regolith mining and space operations

STEM Americas Foundation logo

STEM Americas Foundation

MagDrive Technologies Inc. logo

MagDrive Technologies Inc.

Manufacturing & Processing

Eliminating fugitive emissions and delivering zero-leak performance and durability

COI Energy logo

COI Energy

Energy & Power

AI and machine learning to predict and prevent energy waste

CrowdComfort logo

CrowdComfort

Infrastructure & Construction

Prophet AI logo

Prophet AI

Food, Water, & Land

AI-based poultry-health-monitoring system to reduce chicken mortality, save revenue, and avoid carbon emissions

PolyQor (Innova8e) logo

PolyQor (Innova8e)

Manufacturing & Processing

Concept Loop is dedicated to repurposing low-value post-industrial and post-consumer plastic waste into sustainable building materials. Our flagship product, EcoGrete, is used in the production of high-strength paver blocks and tiles, offering an eco-friendly solution while reducing environmental impact.

Biosfera logo

Biosfera

Manufacturing & Processing

Via Separations logo

Via Separations

Manufacturing & Processing

Via Separations — is developing a new membrane material to make manufacturing processes more energy efficient—transforming the production of things like fertilizer and nylon, and with the potential to save a gigaton of carbon each year.

Zero Homes logo

Zero Homes

Infrastructure & Construction

Automated assessment, design, and procurement platform for residential building retrofits

Top Grain Technologies logo

Top Grain Technologies

Energy & Power

Top Grain Technologies — is commercializing a scalable high-throughput heat treatment solution that imparts a directionally solidified grain structure to additively manufactured (AM) Ni-base superalloys, enabling their use in the most demanding high-temperature applications, from combustion turbines to rocket engines

Massachusetts Climatetech Studio logo

Massachusetts Climatetech Studio

Energy & Power

MicroEra Power logo

MicroEra Power

Energy & Power

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

Starfire Energy logo

Starfire Energy

Energy & Power

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