Helping entrepreneursTransformindustry faster
They scale when entire ecosystems move together: founders, corporates, capital, policy, and communities, united by a shared purpose of propelling groundbreaking technologies to market, at the pace the world requires.
Transforming the systems that power, move, feed, and connect the world is the work of our time, and startups hold the key.
Greentown is a 501(c)(3) non-profit organization
AgZen
Food, Water, & Land
AI that monitors leaf coverage during spraying to reduce pesticide usage
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Adiabatic Materials
Manufacturing & Processing
Unlocking clean, affordable chemical production with electricity
Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
Lumiere Solutions
Infrastructure & Construction
Residential low-voltage and automated single efficiency-driven ecosystems that reduce energy waste
Kausalyze
Manufacturing & Processing
True root-cause analysis for chemicals, energy, and pharmaceutical companies
Lasso Labs
Food, Water, & Land
Using natural proteins to create real texture in alternative foods
Eden GeoPower
Energy & Power
Electrical Reservoir Stimulation to enhance subsurface permeability
Resollant
Manufacturing & Processing
Enables industrial-scale hydrogen & syngas production while capturing carbon as a monetizable solid at scale
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Kanin Energy
Energy & Power
Monetizing industrial waste heat with reduced deployment risk via third-party financing
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
AgZen
Food, Water, & Land
AI that monitors leaf coverage during spraying to reduce pesticide usage
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Adiabatic Materials
Manufacturing & Processing
Unlocking clean, affordable chemical production with electricity
Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
Lumiere Solutions
Infrastructure & Construction
Residential low-voltage and automated single efficiency-driven ecosystems that reduce energy waste
Kausalyze
Manufacturing & Processing
True root-cause analysis for chemicals, energy, and pharmaceutical companies
Lasso Labs
Food, Water, & Land
Using natural proteins to create real texture in alternative foods
Eden GeoPower
Energy & Power
Electrical Reservoir Stimulation to enhance subsurface permeability
Resollant
Manufacturing & Processing
Enables industrial-scale hydrogen & syngas production while capturing carbon as a monetizable solid at scale
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Kanin Energy
Energy & Power
Monetizing industrial waste heat with reduced deployment risk via third-party financing
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
Teal Bio
Manufacturing & Processing
Reusable N95 respirator system for healthcare workers to reduce landfill waste
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
LiftOFF Technology
Energy & Power
Batteries with breakthrough energy density and safety
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Imperium Technologies
Energy & Power
Reducing industrial heating emissions with electrochemical processes
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
Haffner Energy
Energy & Power
Producing renewable energy via waste-biomass thermolysis
Catalyxx
Manufacturing & Processing
Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Pike Robotics
Energy & Power
Wall-crawling robots with advanced sensors to perform in-service inspections inside hazardous spaces
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
Highland Park Technologies
Infrastructure & Construction
Insulated cladding and building envelope retrofits at a fraction of the cost
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen
SPHINX INC
Energy & Power
High-speed 24/7 energy trading with blockchain clarity and instant settlement
Simlionics
Energy & Power
Physics-aware, advanced AI battery modeling and intelligence for EV and energy-storage systems
Teal Bio
Manufacturing & Processing
Reusable N95 respirator system for healthcare workers to reduce landfill waste
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
LiftOFF Technology
Energy & Power
Batteries with breakthrough energy density and safety
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Imperium Technologies
Energy & Power
Reducing industrial heating emissions with electrochemical processes
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
Haffner Energy
Energy & Power
Producing renewable energy via waste-biomass thermolysis
Catalyxx
Manufacturing & Processing
Catalytic tech to turn bio-ethanol into high-value, carbon-negative chemicals
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Pike Robotics
Energy & Power
Wall-crawling robots with advanced sensors to perform in-service inspections inside hazardous spaces
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
Highland Park Technologies
Infrastructure & Construction
Insulated cladding and building envelope retrofits at a fraction of the cost
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen
SPHINX INC
Energy & Power
High-speed 24/7 energy trading with blockchain clarity and instant settlement
Simlionics
Energy & Power
Physics-aware, advanced AI battery modeling and intelligence for EV and energy-storage systems
Our Startups Have Raised Over $0B
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Startups Operate
12,915 new jobs created by our members, and counting
Boston
7,492
Houston
5,423
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.
Learn About our Programs
In addition to our Boston and Houston incubators, Greentown runs programs designed to address critical challenges in the climatetech ecosystem.