Helping climatetech startupsTransformindustry faster
Allium Engineering
Manufacturing & Processing
Allium Engineering — is a US-based startup founded by two MIT Ph.D graduates that designs and manufactures coated rebar technology that will create a more resilient, affordable, and sustainable infrastructure.
Malta
Energy & Power
Raise Green
Energy & Power
Raise Green — helps make it easy to start your own solar energy project or climate action company. Anyone can start a project on Raise Green and bring clean energy to their business or community.
Applied Bioplastics
Food, Water, & Land
Applied Bioplastics — is commercializing plant-based polymers that are far healthier and more sustainable, at competitive pricing to their petrochemical-based analogues
Autonomous Marine Systems
Food, Water, & Land
Earthbond
Energy & Power
Earthbond — is a platform that connects urban Nigerians with affordable financing for clean, reliable energy. They leverage group financing and carbon accounting to lower costs and risk in the energy transition of Nigeria’s $14B fuel-based, off-grid generator market.
Aquosmic Corporation
Energy & Power
Aquosmic — analyzes any body of water using satellite images and can determine biomass as well.
BlakBear
Food, Water, & Land
Radical Plastics
Manufacturing & Processing
Radical Plastics — is commercializing a patented technology for producing economical, biodegradable plastics that are a drop-in replacement for conventional, persistent plastics.
Planckton Data
Manufacturing & Processing
Planckton Data — is making a platform that is built to manage the entire carbon data lifecycle by automating data collection and conversion and producing insights quickly without the need to make extensive changes to existing systems
Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices
AmHyTech
Energy & Power
We build last-mile ammonia infrastructure for marine fuel, agriculture, and industrial applications.
Metalmark Innovations
Transportation & Logistics
WattGlass
Energy & Power
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
Electric Fish
Energy & Power
Electric Fish — deploys NanoGrids at gas-stations for extreme-fast EV charging, and grid-scale energy-backup.
Seabound
Transportation & Logistics
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.
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
sweetgreen
Food, Water, & Land
Allium Engineering
Manufacturing & Processing
Allium Engineering — is a US-based startup founded by two MIT Ph.D graduates that designs and manufactures coated rebar technology that will create a more resilient, affordable, and sustainable infrastructure.
Malta
Energy & Power
Raise Green
Energy & Power
Raise Green — helps make it easy to start your own solar energy project or climate action company. Anyone can start a project on Raise Green and bring clean energy to their business or community.
Applied Bioplastics
Food, Water, & Land
Applied Bioplastics — is commercializing plant-based polymers that are far healthier and more sustainable, at competitive pricing to their petrochemical-based analogues
Autonomous Marine Systems
Food, Water, & Land
Earthbond
Energy & Power
Earthbond — is a platform that connects urban Nigerians with affordable financing for clean, reliable energy. They leverage group financing and carbon accounting to lower costs and risk in the energy transition of Nigeria’s $14B fuel-based, off-grid generator market.
Aquosmic Corporation
Energy & Power
Aquosmic — analyzes any body of water using satellite images and can determine biomass as well.
BlakBear
Food, Water, & Land
Radical Plastics
Manufacturing & Processing
Radical Plastics — is commercializing a patented technology for producing economical, biodegradable plastics that are a drop-in replacement for conventional, persistent plastics.
Planckton Data
Manufacturing & Processing
Planckton Data — is making a platform that is built to manage the entire carbon data lifecycle by automating data collection and conversion and producing insights quickly without the need to make extensive changes to existing systems
Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices
AmHyTech
Energy & Power
We build last-mile ammonia infrastructure for marine fuel, agriculture, and industrial applications.
Metalmark Innovations
Transportation & Logistics
WattGlass
Energy & Power
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
Electric Fish
Energy & Power
Electric Fish — deploys NanoGrids at gas-stations for extreme-fast EV charging, and grid-scale energy-backup.
Seabound
Transportation & Logistics
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.
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
sweetgreen
Food, Water, & Land
SWTCH Energy Inc.
Transportation & Logistics
Form Energy
Energy & Power
Cost-effective, multi-day energy-storage solutions
AquaNRG
Energy & Power
AquaNRG is provider of advanced technologies for subsurface energy and environmental applications. AquaNRG's technology has been funded through $1.4M grants by the US Department of Energy and National Science Foundation.
Fervo Energy
Energy & Power
Fervo Energy — is a next-generation geothermal power developer, delivering 24/7 carbon-free energy.
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Gemini Energy
We are building the world first unified system for hydrogen compression and purification at 100% recovery rate and 99.999% purity.
Hera Materials
Manufacturing & Processing
Regenerative plastics made from diverse, local biomass, powered by robotics and AI
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.
Solas Capture
Solas Capture is developing a sunlight-powered process for sustainable lithium carbonate production using novel photobase chemistry. Our technology converts lithium brines and CO₂ into battery-grade materials with lower energy use, reduced waste, and a significantly smaller environmental footprint than conventional methods.
VentureWell
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.
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
GreenLIB
Manufacturing & Processing
EcoForge
Food, Water, & Land
-- is a building material technology company developing affordable, high-performance building materials from local agricultural residues, replacing energy-intensive, fossil-based materials. This sustainable approach increases resilience to climate and supply chain risks, supports local farming, and job creation. Moreover, EcoForge’s toxic chemical-free material recipe promotes healthier indoor environments.
Alkemy Environmental
Manufacturing & Processing
Alkemy Environmental — holds the only technology solution that can recycle waste into high strength ceramics for the building materials market.
Infranergy
Energy & Power
Puro Renewables
Manufacturing & Processing
Puro Renewables (Miami Beach, FL) upcycles carbon-negative biowaste for use in reducing the amount of fossil-fuel-based resin and carbon footprint in typical plastic products.
Energiency
Manufacturing & Processing
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
AMPeers
Energy & Power
Advanced MOCVD resulting in high-temp superconductors with higher performance, faster output, and lower cost
SWTCH Energy Inc.
Transportation & Logistics
Form Energy
Energy & Power
Cost-effective, multi-day energy-storage solutions
AquaNRG
Energy & Power
AquaNRG is provider of advanced technologies for subsurface energy and environmental applications. AquaNRG's technology has been funded through $1.4M grants by the US Department of Energy and National Science Foundation.
Fervo Energy
Energy & Power
Fervo Energy — is a next-generation geothermal power developer, delivering 24/7 carbon-free energy.
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Gemini Energy
We are building the world first unified system for hydrogen compression and purification at 100% recovery rate and 99.999% purity.
Hera Materials
Manufacturing & Processing
Regenerative plastics made from diverse, local biomass, powered by robotics and AI
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.
Solas Capture
Solas Capture is developing a sunlight-powered process for sustainable lithium carbonate production using novel photobase chemistry. Our technology converts lithium brines and CO₂ into battery-grade materials with lower energy use, reduced waste, and a significantly smaller environmental footprint than conventional methods.
VentureWell
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.
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
GreenLIB
Manufacturing & Processing
EcoForge
Food, Water, & Land
-- is a building material technology company developing affordable, high-performance building materials from local agricultural residues, replacing energy-intensive, fossil-based materials. This sustainable approach increases resilience to climate and supply chain risks, supports local farming, and job creation. Moreover, EcoForge’s toxic chemical-free material recipe promotes healthier indoor environments.
Alkemy Environmental
Manufacturing & Processing
Alkemy Environmental — holds the only technology solution that can recycle waste into high strength ceramics for the building materials market.
Infranergy
Energy & Power
Puro Renewables
Manufacturing & Processing
Puro Renewables (Miami Beach, FL) upcycles carbon-negative biowaste for use in reducing the amount of fossil-fuel-based resin and carbon footprint in typical plastic products.
Energiency
Manufacturing & Processing
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
AMPeers
Energy & Power
Advanced MOCVD resulting in high-temp superconductors with higher performance, faster output, and lower cost
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
All-time
0
Currently home to
0
0+
Countries Where
Startups Operate
0
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.
Explore Investing
Tap into deal flow with the world’s largest community of climate and energy startups.