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
Simlionics
Energy & Power
Physics-aware, advanced AI battery modeling and intelligence for EV and energy-storage systems
Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
MCatalysis
Manufacturing & Processing
Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Cala Systems
Energy & Power
Intelligent heat-pump water heaters
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen
frakktal
Manufacturing & Processing
Biobased polymer process to upend PVC overuse
Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
Nomadic Drones
Energy & Power
The first autonomos drone allowing continuous and relocatable high-voltage power line monitoring
Steven Winter Associates, Inc.
Infrastructure & Construction
Research, consulting, and advisory services to improve commercial, residential, and multifamily built environments
Simlionics
Energy & Power
Physics-aware, advanced AI battery modeling and intelligence for EV and energy-storage systems
Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
MCatalysis
Manufacturing & Processing
Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Adept Materials
Infrastructure & Construction
Material innovations that improve moisture regulation, comfort, and energy efficiency
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Cala Systems
Energy & Power
Intelligent heat-pump water heaters
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen
frakktal
Manufacturing & Processing
Biobased polymer process to upend PVC overuse
Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
Nomadic Drones
Energy & Power
The first autonomos drone allowing continuous and relocatable high-voltage power line monitoring
Steven Winter Associates, Inc.
Infrastructure & Construction
Research, consulting, and advisory services to improve commercial, residential, and multifamily built environments
Cellen
Transportation & Logistics
Hydrogen-powered drones, combining UAV technology with hydrogen refueling solutions
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
ETAK
ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.
Haffner Energy
Energy & Power
Producing renewable energy via waste-biomass thermolysis
NewGenium
Energy & Power
Advanced brine-to-battery grade LFP technology
TDS Select
Food, Water, & Land
Modular, scalable FCDI system capable of desalinating brackish water using low energy
eSki Watercraft
Energy & Power
Electric personal watercraft
Andros Innovations
Manufacturing & Processing
Reducing the costs and energy demands of ammonia production through advanced reactor technology
Prophet AI
Food, Water, & Land
AI-based poultry-health-monitoring system to reduce chicken mortality, save revenue, and avoid carbon emissions
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Clear Sky Innovations
Manufacturing & Processing
A physics-based, AI-powered geoscience platform that uses multi-modal data sets to minimize time spent on data wrangling
Imperium Technologies
Energy & Power
Reducing industrial heating emissions with electrochemical processes
Fleet Robotics
Transportation & Logistics
Robotics to clean biofouling from ship hulls, improving fuel consumption for large ships
Decimetrix
Energy & Power
AI platform to help clients measure their carbon footprint
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
Cellen
Transportation & Logistics
Hydrogen-powered drones, combining UAV technology with hydrogen refueling solutions
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
ETAK
ETAK transforms waste into clean energy. Our modular technology converts unsorted municipal and industrial waste into high-calorific gas, offering a decentralized, 24/7 alternative to fossil fuels and traditional incineration.
Haffner Energy
Energy & Power
Producing renewable energy via waste-biomass thermolysis
NewGenium
Energy & Power
Advanced brine-to-battery grade LFP technology
TDS Select
Food, Water, & Land
Modular, scalable FCDI system capable of desalinating brackish water using low energy
eSki Watercraft
Energy & Power
Electric personal watercraft
Andros Innovations
Manufacturing & Processing
Reducing the costs and energy demands of ammonia production through advanced reactor technology
Prophet AI
Food, Water, & Land
AI-based poultry-health-monitoring system to reduce chicken mortality, save revenue, and avoid carbon emissions
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Clear Sky Innovations
Manufacturing & Processing
A physics-based, AI-powered geoscience platform that uses multi-modal data sets to minimize time spent on data wrangling
Imperium Technologies
Energy & Power
Reducing industrial heating emissions with electrochemical processes
Fleet Robotics
Transportation & Logistics
Robotics to clean biofouling from ship hulls, improving fuel consumption for large ships
Decimetrix
Energy & Power
AI platform to help clients measure their carbon footprint
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
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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.