Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
ConnectDER logo

ConnectDER

Energy & Power

ConnectDER — unlocks the massive potential of DERs by turning the meter socket into the utility’s all-in-one plug-in point for solar, storage, EVs, and beyond.

Rushnu logo

Rushnu

Manufacturing & Processing

Turns waste into carbon-neutral chemistry

SiTration logo

SiTration

Manufacturing & Processing

SiTration — is developing a novel membrane filtration technology that combines durability and performance at low cost to enable highly efficient separations in today’s mega-industries.

REON Technology logo

REON Technology

Energy & Power

AI-driven optimization of systems through tailored power management of batteries and PV panels for energy storage

Nexus Circular logo

Nexus Circular

Manufacturing & Processing

Planetary Hydrogen logo

Planetary Hydrogen

Manufacturing & Processing

Climate Core Capital logo

Climate Core Capital

Infrastructure & Construction

Climate Core — runs a climate-oriented real estate strategy, namely acquiring buildings in low climate risk locations and making those buildings the most resilient in the built environment.

Opus One Solutions logo

Opus One Solutions

Energy & Power

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.

Risk Consulting Partners logo

Risk Consulting Partners

Energy & Power

GreenLIB logo

GreenLIB

Manufacturing & Processing

Optigon logo

Optigon

Energy & Power

Rapid, contactless characterization for assessing performance during photovoltaic solar cell fabrication

XMtrace logo

XMtrace

Manufacturing & Processing

Low-cost methane monitoring with real-time detection and autonomous response

Electra logo

Electra

Manufacturing & Processing

ElectraSteel's — mission is to electrify and decarbonize steelmaking using renewable energy with zero carbon dioxide emissions while lowering the energy intensity and cost.

Global ROC logo

Global ROC

Food, Water, & Land

Global ROC — provides an innovative technology solution for cooling tower systems that reduces chemical consumption, saves water, and decreases energy costs.

Dandelion Energy logo

Dandelion Energy

Infrastructure & Construction

Geothermal heating and cooling systems for homes

Synergetic LLC logo

Synergetic LLC

Energy & Power

Synergetic — facilitates infrastructure solutions that unlock and unleash the power of renewables and eliminate or minimize obstacles to rapid renewable energy development and use in congested electricity markets.

Sustainable America logo

Sustainable America

Food, Water, & Land

Loop CO2 logo

Loop CO2

Manufacturing & Processing

Transforming CO₂ into sustainable polymers to create fully recyclable materials

enaDyne logo

enaDyne

Manufacturing & Processing

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

ConnectDER logo

ConnectDER

Energy & Power

ConnectDER — unlocks the massive potential of DERs by turning the meter socket into the utility’s all-in-one plug-in point for solar, storage, EVs, and beyond.

Rushnu logo

Rushnu

Manufacturing & Processing

Turns waste into carbon-neutral chemistry

SiTration logo

SiTration

Manufacturing & Processing

SiTration — is developing a novel membrane filtration technology that combines durability and performance at low cost to enable highly efficient separations in today’s mega-industries.

REON Technology logo

REON Technology

Energy & Power

AI-driven optimization of systems through tailored power management of batteries and PV panels for energy storage

Nexus Circular logo

Nexus Circular

Manufacturing & Processing

Planetary Hydrogen logo

Planetary Hydrogen

Manufacturing & Processing

Climate Core Capital logo

Climate Core Capital

Infrastructure & Construction

Climate Core — runs a climate-oriented real estate strategy, namely acquiring buildings in low climate risk locations and making those buildings the most resilient in the built environment.

Opus One Solutions logo

Opus One Solutions

Energy & Power

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.

Risk Consulting Partners logo

Risk Consulting Partners

Energy & Power

GreenLIB logo

GreenLIB

Manufacturing & Processing

Optigon logo

Optigon

Energy & Power

Rapid, contactless characterization for assessing performance during photovoltaic solar cell fabrication

XMtrace logo

XMtrace

Manufacturing & Processing

Low-cost methane monitoring with real-time detection and autonomous response

Electra logo

Electra

Manufacturing & Processing

ElectraSteel's — mission is to electrify and decarbonize steelmaking using renewable energy with zero carbon dioxide emissions while lowering the energy intensity and cost.

Global ROC logo

Global ROC

Food, Water, & Land

Global ROC — provides an innovative technology solution for cooling tower systems that reduces chemical consumption, saves water, and decreases energy costs.

Dandelion Energy logo

Dandelion Energy

Infrastructure & Construction

Geothermal heating and cooling systems for homes

Synergetic LLC logo

Synergetic LLC

Energy & Power

Synergetic — facilitates infrastructure solutions that unlock and unleash the power of renewables and eliminate or minimize obstacles to rapid renewable energy development and use in congested electricity markets.

Sustainable America logo

Sustainable America

Food, Water, & Land

Loop CO2 logo

Loop CO2

Manufacturing & Processing

Transforming CO₂ into sustainable polymers to create fully recyclable materials

enaDyne logo

enaDyne

Manufacturing & Processing

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

Wastewizer Technologies logo

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.

Innoveering logo

Innoveering

Manufacturing & Processing

Phlair logo

Phlair

Manufacturing & Processing

Renewable-energy-powered DAC system using an electrochemical process for acid and base generation

Molecule Works Inc. logo

Molecule Works Inc.

Manufacturing & Processing

We are developing a low-cost (less than $100/ton) solid sorbent DAC system based on our proprietary reactor/contactor configuration. This design yields very high productivity by delivering low pressure drop, very high heat and mass transfer rates and high sorbent loading. Heat is provided through ls closed loop low temp hot water system so that no steam is needed. After initial charge, no water is consumed. Regeneration is achieved in 20 to 30 minutes.

CeraPhi Energy logo

CeraPhi Energy

Energy & Power

CeraPhi Energy — is a geothermal energy company developing a “plug and play” scalable technology platform.

ZettaConn logo

ZettaConn

Energy & Power

Endeavor Composites logo

Endeavor Composites

Manufacturing & Processing

Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry

Paragon Pure logo

Paragon Pure

Food, Water, & Land

Keystone Tower Systems logo

Keystone Tower Systems

Energy & Power

eologix sensor technology logo

eologix sensor technology

Energy & Power

Adept Materials logo

Adept Materials

Infrastructure & Construction

Material innovations that improve moisture regulation, comfort, and energy efficiency

Studio 3e8 logo

Studio 3e8

Manufacturing & Processing

Metal 3D printing in a desktop form factor.

Pressure Core logo

Pressure Core

Manufacturing & Processing

Pressure Core — is a development company focused on transforming industrial waste pressure into emission-free power. The company simplifies project development for host facilities by offering to buy their waste stream instead of selling them a project.

Noteworthy AI logo

Noteworthy AI

Energy & Power

Noteworthy AI — helps electric utilities increase the reliability, resiliency and safety of the distribution grid while reducing cost.

Building Envelope Materials logo

Building Envelope Materials

Infrastructure & Construction

Resolute Methane logo

Resolute Methane

Food, Water, & Land

Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design

NBD Nano logo

NBD Nano

Manufacturing & Processing

NBD Nano — utilizes biomimicry to create functional and durable surface coatings that improve water collection, transport, and repellency.

FAST Metals logo

FAST Metals

Manufacturing & Processing

Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings

Deep Anchor Solutions logo

Deep Anchor Solutions

Infrastructure & Construction

Anchoring solutions for floating applications including energy, aquaculture, and large-scale infrastructure

Sunforge logo

Sunforge

Energy & Power

Sunforge — creates advanced Maximum Power Point Tracking (MPPT) solar charge controllers for off-grid applications. Its controllers are designed to extract the most power possible from your solar panels and maximize system up-time through the worst conditions.

Wastewizer Technologies logo

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.

Innoveering logo

Innoveering

Manufacturing & Processing

Phlair logo

Phlair

Manufacturing & Processing

Renewable-energy-powered DAC system using an electrochemical process for acid and base generation

Molecule Works Inc. logo

Molecule Works Inc.

Manufacturing & Processing

We are developing a low-cost (less than $100/ton) solid sorbent DAC system based on our proprietary reactor/contactor configuration. This design yields very high productivity by delivering low pressure drop, very high heat and mass transfer rates and high sorbent loading. Heat is provided through ls closed loop low temp hot water system so that no steam is needed. After initial charge, no water is consumed. Regeneration is achieved in 20 to 30 minutes.

CeraPhi Energy logo

CeraPhi Energy

Energy & Power

CeraPhi Energy — is a geothermal energy company developing a “plug and play” scalable technology platform.

ZettaConn logo

ZettaConn

Energy & Power

Endeavor Composites logo

Endeavor Composites

Manufacturing & Processing

Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry

Paragon Pure logo

Paragon Pure

Food, Water, & Land

Keystone Tower Systems logo

Keystone Tower Systems

Energy & Power

eologix sensor technology logo

eologix sensor technology

Energy & Power

Adept Materials logo

Adept Materials

Infrastructure & Construction

Material innovations that improve moisture regulation, comfort, and energy efficiency

Studio 3e8 logo

Studio 3e8

Manufacturing & Processing

Metal 3D printing in a desktop form factor.

Pressure Core logo

Pressure Core

Manufacturing & Processing

Pressure Core — is a development company focused on transforming industrial waste pressure into emission-free power. The company simplifies project development for host facilities by offering to buy their waste stream instead of selling them a project.

Noteworthy AI logo

Noteworthy AI

Energy & Power

Noteworthy AI — helps electric utilities increase the reliability, resiliency and safety of the distribution grid while reducing cost.

Building Envelope Materials logo

Building Envelope Materials

Infrastructure & Construction

Resolute Methane logo

Resolute Methane

Food, Water, & Land

Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design

NBD Nano logo

NBD Nano

Manufacturing & Processing

NBD Nano — utilizes biomimicry to create functional and durable surface coatings that improve water collection, transport, and repellency.

FAST Metals logo

FAST Metals

Manufacturing & Processing

Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings

Deep Anchor Solutions logo

Deep Anchor Solutions

Infrastructure & Construction

Anchoring solutions for floating applications including energy, aquaculture, and large-scale infrastructure

Sunforge logo

Sunforge

Energy & Power

Sunforge — creates advanced Maximum Power Point Tracking (MPPT) solar charge controllers for off-grid applications. Its controllers are designed to extract the most power possible from your solar panels and maximize system up-time through the worst conditions.

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