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
Respire Energy
Energy & Power
Safe, low-cost, and long-duration metal-air battery designed for microgrids
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
Decimetrix
Energy & Power
AI platform to help clients measure their carbon footprint
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
GS Vortex Systems
Food, Water, & Land
Hydrodynamic flow technology reducing flow resistance through pipes
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile
NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
Circular Materials
Manufacturing & Processing
Critical raw materials from industrial wastewater
Carbion
Manufacturing & Processing
Affordable and clean biomass transformation to graphite for batteries
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
Corrolytics
Energy & Power
Corrosion detection through electrochemical innovation, integrated with advanced AI technology
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
Teknobuilt
Infrastructure & Construction
Cloud-based construction project management software
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
Respire Energy
Energy & Power
Safe, low-cost, and long-duration metal-air battery designed for microgrids
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
Decimetrix
Energy & Power
AI platform to help clients measure their carbon footprint
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
GS Vortex Systems
Food, Water, & Land
Hydrodynamic flow technology reducing flow resistance through pipes
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile
NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
Circular Materials
Manufacturing & Processing
Critical raw materials from industrial wastewater
Carbion
Manufacturing & Processing
Affordable and clean biomass transformation to graphite for batteries
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
Corrolytics
Energy & Power
Corrosion detection through electrochemical innovation, integrated with advanced AI technology
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
Teknobuilt
Infrastructure & Construction
Cloud-based construction project management software
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
QEA Tech
Energy & Power
Precise, data-driven building-envelope audits using patented AI software, drones, and thermography
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
Wellbore Consultants
Energy & Power
Advanced subsurface stimulation systems to improve resource recovery while reducing energy intensity, water usage, and surface impact
SBD Technologies
Transportation & Logistics
Fully automated, scalable EV home charging and energy optimization solutions for sustainable fleet management
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
ATOM-X
Energy & Power
Transforming CO₂ into sustainable fuels like green methanol
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers
Priority Investor Loans
Infrastructure & Construction
Simplified loan programs to fund real estate investors nationwide with income-producing properties
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Elementa Partners
Infrastructure & Construction
Uniting global talent to unlock high-conviction, institutional-grade investments across Texas growth sectors
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
QEA Tech
Energy & Power
Precise, data-driven building-envelope audits using patented AI software, drones, and thermography
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
Wellbore Consultants
Energy & Power
Advanced subsurface stimulation systems to improve resource recovery while reducing energy intensity, water usage, and surface impact
SBD Technologies
Transportation & Logistics
Fully automated, scalable EV home charging and energy optimization solutions for sustainable fleet management
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
ATOM-X
Energy & Power
Transforming CO₂ into sustainable fuels like green methanol
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers
Priority Investor Loans
Infrastructure & Construction
Simplified loan programs to fund real estate investors nationwide with income-producing properties
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Elementa Partners
Infrastructure & Construction
Uniting global talent to unlock high-conviction, institutional-grade investments across Texas growth sectors
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
Our Startups Have Raised Over $0B
All-time
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Currently home to
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Countries Where
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.