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
Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining
frakktal
Manufacturing & Processing
Biobased polymer process to upend PVC overuse
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
Sparkplug Power
Energy & Power
Energy-storage-as-a-service for municipal utilities and commercial businesses
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Innovator Energy
Energy & Power
Developing and deploying solutions in cooling, heating, and heat transfer
Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
GeoTeknica
Manufacturing & Processing
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Lasso Labs
Food, Water, & Land
Using natural proteins to create real texture in alternative foods
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Solidec
Manufacturing & Processing
Converting carbon into chemicals using only air, water, and renewable electricity
Kanin Energy
Energy & Power
Monetizing industrial waste heat with reduced deployment risk via third-party financing
Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining
frakktal
Manufacturing & Processing
Biobased polymer process to upend PVC overuse
Elementium Materials
Energy & Power
Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries
Sparkplug Power
Energy & Power
Energy-storage-as-a-service for municipal utilities and commercial businesses
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Innovator Energy
Energy & Power
Developing and deploying solutions in cooling, heating, and heat transfer
Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
GeoTeknica
Manufacturing & Processing
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Lasso Labs
Food, Water, & Land
Using natural proteins to create real texture in alternative foods
Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Solidec
Manufacturing & Processing
Converting carbon into chemicals using only air, water, and renewable electricity
Kanin Energy
Energy & Power
Monetizing industrial waste heat with reduced deployment risk via third-party financing
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Ensovi
Manufacturing & Processing
Cofactor recycling platform for sustainable drug manufacturing
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
SkyH2O
Food, Water, & Land
Atmospheric water generation for commercial and government projects
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
TransOceans Clean Energy Risk, LLC
Energy & Power
Risk management solutions for global clean tech risk portfolios
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries
MCatalysis
Manufacturing & Processing
Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
Hera Materials
Manufacturing & Processing
Regenerative plastics made from diverse, local biomass, powered by robotics and AI
Onboard Data
Infrastructure & Construction
Onboard — offers software analytics for HVAC service providers.
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
InnoEnergy (Member Account)
Energy & Power
Industrializing cleantech innovation to enable and grow a global net-zero economy
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Ensovi
Manufacturing & Processing
Cofactor recycling platform for sustainable drug manufacturing
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
SkyH2O
Food, Water, & Land
Atmospheric water generation for commercial and government projects
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
TransOceans Clean Energy Risk, LLC
Energy & Power
Risk management solutions for global clean tech risk portfolios
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries
MCatalysis
Manufacturing & Processing
Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
Hera Materials
Manufacturing & Processing
Regenerative plastics made from diverse, local biomass, powered by robotics and AI
Onboard Data
Infrastructure & Construction
Onboard — offers software analytics for HVAC service providers.
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
InnoEnergy (Member Account)
Energy & Power
Industrializing cleantech innovation to enable and grow a global net-zero economy
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Our Startups Have Raised Over $0B
All-time
0
Currently home to
0
0+
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.