Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
AmpUp logo

AmpUp

Transportation & Logistics

Opus One Solutions logo

Opus One Solutions

Energy & Power

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.

10DQ logo

10DQ

Energy & Power

Battery tech for long-duration energy storage at lower costs and improved safety

Electrona Robotics logo

Electrona Robotics

Manufacturing & Processing

Harmony Desalting logo

Harmony Desalting

Food, Water, & Land

Batch reverse osmosis process for low-cost water desalination

BlakBear logo

BlakBear

Food, Water, & Land

Mantel logo

Mantel

Manufacturing & Processing

Mantel — is developing the most thermally efficient and lowest cost carbon capture technology - helping the world reduce atmospheric CO2 levels.

InventWood logo

InventWood

Infrastructure & Construction

InventWood — offers MettleWood, a super-strong wood material (that's stronger than steel), a highly insulative wood material (as a green substitute for polystyrene) and even a transparent wood material.

Haffner Energy logo

Haffner Energy

Energy & Power

Producing renewable energy via waste-biomass thermolysis

TalkingHeads Wireless logo

TalkingHeads Wireless

Energy & Power

TalkingHeads Wireless — develops Smart Network Towers, starting with the world’s most energy-efficient remote radio heads (RRH), which is the hardware box that sits at the top of the cell tower.

AeroNero logo

AeroNero

Food, Water, & Land

Water for all, always Empowering sustainable living through innovative air-water generation technology, providing clean and accessible water to communities while combating climate change.

WhaleSpotter logo

WhaleSpotter

Transportation & Logistics

Thermal imaging and AI to prevent marine mammal strikes at sea

Massachusetts Materials Technologies logo

Massachusetts Materials Technologies

Energy & Power

Seamlessly measuring the mechanical properties of pipelines without interruption

CeraPhi Energy logo

CeraPhi Energy

Energy & Power

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

Beantrust logo

Beantrust

Food, Water, & Land

Starfire Energy logo

Starfire Energy

Energy & Power

Vecarius logo

Vecarius

Infrastructure & Construction

Heat-to-electricity technology to boost energy efficiency in mass markets

MissionPoint Capital Partners logo

MissionPoint Capital Partners

Clean Crop Technologies logo

Clean Crop Technologies

Food, Water, & Land

Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

AmpUp logo

AmpUp

Transportation & Logistics

Opus One Solutions logo

Opus One Solutions

Energy & Power

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.

10DQ logo

10DQ

Energy & Power

Battery tech for long-duration energy storage at lower costs and improved safety

Electrona Robotics logo

Electrona Robotics

Manufacturing & Processing

Harmony Desalting logo

Harmony Desalting

Food, Water, & Land

Batch reverse osmosis process for low-cost water desalination

BlakBear logo

BlakBear

Food, Water, & Land

Mantel logo

Mantel

Manufacturing & Processing

Mantel — is developing the most thermally efficient and lowest cost carbon capture technology - helping the world reduce atmospheric CO2 levels.

InventWood logo

InventWood

Infrastructure & Construction

InventWood — offers MettleWood, a super-strong wood material (that's stronger than steel), a highly insulative wood material (as a green substitute for polystyrene) and even a transparent wood material.

Haffner Energy logo

Haffner Energy

Energy & Power

Producing renewable energy via waste-biomass thermolysis

TalkingHeads Wireless logo

TalkingHeads Wireless

Energy & Power

TalkingHeads Wireless — develops Smart Network Towers, starting with the world’s most energy-efficient remote radio heads (RRH), which is the hardware box that sits at the top of the cell tower.

AeroNero logo

AeroNero

Food, Water, & Land

Water for all, always Empowering sustainable living through innovative air-water generation technology, providing clean and accessible water to communities while combating climate change.

WhaleSpotter logo

WhaleSpotter

Transportation & Logistics

Thermal imaging and AI to prevent marine mammal strikes at sea

Massachusetts Materials Technologies logo

Massachusetts Materials Technologies

Energy & Power

Seamlessly measuring the mechanical properties of pipelines without interruption

CeraPhi Energy logo

CeraPhi Energy

Energy & Power

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

Beantrust logo

Beantrust

Food, Water, & Land

Starfire Energy logo

Starfire Energy

Energy & Power

Vecarius logo

Vecarius

Infrastructure & Construction

Heat-to-electricity technology to boost energy efficiency in mass markets

MissionPoint Capital Partners logo

MissionPoint Capital Partners

Clean Crop Technologies logo

Clean Crop Technologies

Food, Water, & Land

Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

Phoenix Tailings logo

Phoenix Tailings

Manufacturing & Processing

Waste-free, net-zero, cost-competitive rare-earth-metal refining

Helix Earth Technologies logo

Helix Earth Technologies

Infrastructure & Construction

Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

Armeta logo

Armeta

Armeta AI is the structured data layer for industrial facilities, turning legacy P&IDs into Material Take-Offs and EPA/OSHA regulatory inventories that power brownfield retrofits, LDAR programs, and energy transition projects across the installed base.

Element Resources logo

Element Resources

Energy & Power

Developing large-scale green hydrogen projects

Thiozen logo

Thiozen

Manufacturing & Processing

Chemical waste-to-hydrogen cycle that removes hydrogen sulfide from gas streams and generates zero-emission hydrogen

Save Energy Systems logo

Save Energy Systems

Infrastructure & Construction

Verdicity logo

Verdicity

Infrastructure & Construction

AI-enabled, customizable smart building, information, and facility services for building vendors

Wiggins Manufacturing & Logistics Consulting logo

Wiggins Manufacturing & Logistics Consulting

Manufacturing & Processing

Help US manufacturers and supply chain companies design new facilities and Lean out existing ones.

Turnover Labs logo

Turnover Labs

Manufacturing & Processing

Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

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.

Canetia Analytics logo

Canetia Analytics

Transportation & Logistics

Canetia Analytics — monitors structures and their natural vibration signature through IoT, artificial intelligence and machine learning to enable a building to be seen from the inside to the outside, continuously and automatically.

Revvit logo

Revvit

Infrastructure & Construction

Low-cost, simple EV charging at commercial, multifamily, fleet parking, and public properties

Sustainable America logo

Sustainable America

Food, Water, & Land

CF Tech logo

CF Tech

Energy & Power

CF Technologies — are experts in Critical Fluid processes turning rancid restaurant and sewer trap grease into advanced renewable fuel.

MacroCycle Technologies logo

MacroCycle Technologies

Manufacturing & Processing

NONA Technologies logo

NONA Technologies

Food, Water, & Land

Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime

H2Pro logo

H2Pro

Energy & Power

H2Pro — is enabling the wide scale adoption of sustainable hydrogen fuel by introducing a novel production technology E-TAC.

Dandelion Energy logo

Dandelion Energy

Infrastructure & Construction

Geothermal heating and cooling systems for homes

Cemvita logo

Cemvita

Manufacturing & Processing

Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop

Mission Zero Technologies logo

Mission Zero Technologies

Manufacturing & Processing

Efficient electrochemistry to capture CO₂

Phoenix Tailings logo

Phoenix Tailings

Manufacturing & Processing

Waste-free, net-zero, cost-competitive rare-earth-metal refining

Helix Earth Technologies logo

Helix Earth Technologies

Infrastructure & Construction

Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

Armeta logo

Armeta

Armeta AI is the structured data layer for industrial facilities, turning legacy P&IDs into Material Take-Offs and EPA/OSHA regulatory inventories that power brownfield retrofits, LDAR programs, and energy transition projects across the installed base.

Element Resources logo

Element Resources

Energy & Power

Developing large-scale green hydrogen projects

Thiozen logo

Thiozen

Manufacturing & Processing

Chemical waste-to-hydrogen cycle that removes hydrogen sulfide from gas streams and generates zero-emission hydrogen

Save Energy Systems logo

Save Energy Systems

Infrastructure & Construction

Verdicity logo

Verdicity

Infrastructure & Construction

AI-enabled, customizable smart building, information, and facility services for building vendors

Wiggins Manufacturing & Logistics Consulting logo

Wiggins Manufacturing & Logistics Consulting

Manufacturing & Processing

Help US manufacturers and supply chain companies design new facilities and Lean out existing ones.

Turnover Labs logo

Turnover Labs

Manufacturing & Processing

Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

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.

Canetia Analytics logo

Canetia Analytics

Transportation & Logistics

Canetia Analytics — monitors structures and their natural vibration signature through IoT, artificial intelligence and machine learning to enable a building to be seen from the inside to the outside, continuously and automatically.

Revvit logo

Revvit

Infrastructure & Construction

Low-cost, simple EV charging at commercial, multifamily, fleet parking, and public properties

Sustainable America logo

Sustainable America

Food, Water, & Land

CF Tech logo

CF Tech

Energy & Power

CF Technologies — are experts in Critical Fluid processes turning rancid restaurant and sewer trap grease into advanced renewable fuel.

MacroCycle Technologies logo

MacroCycle Technologies

Manufacturing & Processing

NONA Technologies logo

NONA Technologies

Food, Water, & Land

Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime

H2Pro logo

H2Pro

Energy & Power

H2Pro — is enabling the wide scale adoption of sustainable hydrogen fuel by introducing a novel production technology E-TAC.

Dandelion Energy logo

Dandelion Energy

Infrastructure & Construction

Geothermal heating and cooling systems for homes

Cemvita logo

Cemvita

Manufacturing & Processing

Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop

Mission Zero Technologies logo

Mission Zero Technologies

Manufacturing & Processing

Efficient electrochemistry to capture CO₂

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