Helping climatetech startupsTransformindustry faster

AmpUp
Transportation & Logistics

Opus One Solutions
Energy & Power

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

Electrona Robotics
Manufacturing & Processing

Harmony Desalting
Food, Water, & Land
Batch reverse osmosis process for low-cost water desalination

BlakBear
Food, Water, & Land

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

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
Energy & Power
Producing renewable energy via waste-biomass thermolysis

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
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
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

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

Beantrust
Food, Water, & Land

Starfire Energy
Energy & Power

Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets

MissionPoint Capital Partners

Clean Crop Technologies
Food, Water, & Land
Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

AmpUp
Transportation & Logistics

Opus One Solutions
Energy & Power

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

Electrona Robotics
Manufacturing & Processing

Harmony Desalting
Food, Water, & Land
Batch reverse osmosis process for low-cost water desalination

BlakBear
Food, Water, & Land

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

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
Energy & Power
Producing renewable energy via waste-biomass thermolysis

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
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
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

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

Beantrust
Food, Water, & Land

Starfire Energy
Energy & Power

Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets

MissionPoint Capital Partners

Clean Crop Technologies
Food, Water, & Land
Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity

Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining

Helix Earth Technologies
Infrastructure & Construction
Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

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
Energy & Power
Developing large-scale green hydrogen projects

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

Save Energy Systems
Infrastructure & Construction

Verdicity
Infrastructure & Construction
AI-enabled, customizable smart building, information, and facility services for building vendors

Wiggins Manufacturing & Logistics Consulting
Manufacturing & Processing
Help US manufacturers and supply chain companies design new facilities and Lean out existing ones.

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

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

Sustainable America
Food, Water, & Land

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
Manufacturing & Processing

NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime

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

Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes

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

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂

Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining

Helix Earth Technologies
Infrastructure & Construction
Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

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
Energy & Power
Developing large-scale green hydrogen projects

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

Save Energy Systems
Infrastructure & Construction

Verdicity
Infrastructure & Construction
AI-enabled, customizable smart building, information, and facility services for building vendors

Wiggins Manufacturing & Logistics Consulting
Manufacturing & Processing
Help US manufacturers and supply chain companies design new facilities and Lean out existing ones.

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

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

Sustainable America
Food, Water, & Land

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
Manufacturing & Processing

NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime

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

Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes

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

Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂




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
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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.

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