Transforming industry faster
Transforming the systems that power, move, feed, and connect the world is the work of our time, and startups hold the key.
But breakthroughs don't scale in isolation.
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.
Adiabatic Materials
Manufacturing & Processing
Unlocking clean, affordable chemical production with electricity
EVident Battery
Transportation & Logistics
Comprehensive, non-destructive inspection solutions for EV battery packs
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
TransOceans Clean Energy Risk, LLC
Energy & Power
Risk management solutions for global clean tech risk portfolios
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC
eSki Watercraft
Energy & Power
Electric personal watercraft
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
Capital Energy
Energy & Power
Helping climatetech companies translate complex work into compelling brands
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
SUPERGirls Shine Foundation
Energy & Power
Developing underserved girls in STEM to support equity in the emerging workforce
Upstream Tech
Energy & Power
Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
Gaia AI
Food, Water, & Land
Collecting high-quality biomass data in forests with drones, LiDAR, and computer vision
Element Resources
Energy & Power
Developing large-scale green hydrogen projects
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
Next Rung Technology
Manufacturing & Processing
Supporting clean technologies in their commercialization journeys with expert engineering consulting
Adiabatic Materials
Manufacturing & Processing
Unlocking clean, affordable chemical production with electricity
EVident Battery
Transportation & Logistics
Comprehensive, non-destructive inspection solutions for EV battery packs
ATS Energy
Energy & Power
Converting waste heat into power without any moving parts
TransOceans Clean Energy Risk, LLC
Energy & Power
Risk management solutions for global clean tech risk portfolios
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC
eSki Watercraft
Energy & Power
Electric personal watercraft
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
Capital Energy
Energy & Power
Helping climatetech companies translate complex work into compelling brands
AmHyTech
Energy & Power
Ammonia infrastructure layer, enabling safe and practical liquid ammonia handling at ambient conditions
SUPERGirls Shine Foundation
Energy & Power
Developing underserved girls in STEM to support equity in the emerging workforce
Upstream Tech
Energy & Power
Software that expands access to environmental data through remote monitoring and reporting for seasonal forecasts
Prithvi Ventures
Investing in startups reducing emissions with unique solutions for net-zero goals
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
Gaia AI
Food, Water, & Land
Collecting high-quality biomass data in forests with drones, LiDAR, and computer vision
Element Resources
Energy & Power
Developing large-scale green hydrogen projects
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
Next Rung Technology
Manufacturing & Processing
Supporting clean technologies in their commercialization journeys with expert engineering consulting
HarvestAi
Food, Water, & Land
Computer vision and AI to provide greenhouse operators with automated data for optimized harvest planning
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
Solar Materials
Energy & Power
Recovered and recycled secondary solar panel materials
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
Onboard Data
Infrastructure & Construction
Onboard — offers software analytics for HVAC service providers.
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
Boot Box Labs
Energy & Power
Compact, refrigerant-free thermoelectric heat pump for quiet, efficient, climate-neutral HVAC
SBD Technologies
Transportation & Logistics
Fully automated, scalable EV home charging and energy optimization solutions for sustainable fleet management
Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination
Dugu Systems
Energy & Power
Zero-carbon power with an emissions-free gas turbine
Ignition Packaging
About the Company Ignition Packaging is a biomaterials company developing scalable, cost-competitive alternatives to conventional petroleum-based foams. Ignition Packaging’s core technology transforms agricultural byproducts into a high-performance, biodegradable foam engineered […]
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
ThermaFuels
Transportation & Logistics
Deploying scalable, financeable low-carbon methanol and sustainable fuel infrastructure
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
Amplified Industries
Infrastructure & Construction
AI-driven control solution for oil wells using acoustic signals and edge computing to reduce costs and detect issues
Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals
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.
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
HarvestAi
Food, Water, & Land
Computer vision and AI to provide greenhouse operators with automated data for optimized harvest planning
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
Solar Materials
Energy & Power
Recovered and recycled secondary solar panel materials
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
Onboard Data
Infrastructure & Construction
Onboard — offers software analytics for HVAC service providers.
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
Boot Box Labs
Energy & Power
Compact, refrigerant-free thermoelectric heat pump for quiet, efficient, climate-neutral HVAC
SBD Technologies
Transportation & Logistics
Fully automated, scalable EV home charging and energy optimization solutions for sustainable fleet management
Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination
Dugu Systems
Energy & Power
Zero-carbon power with an emissions-free gas turbine
Ignition Packaging
About the Company Ignition Packaging is a biomaterials company developing scalable, cost-competitive alternatives to conventional petroleum-based foams. Ignition Packaging’s core technology transforms agricultural byproducts into a high-performance, biodegradable foam engineered […]
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
ThermaFuels
Transportation & Logistics
Deploying scalable, financeable low-carbon methanol and sustainable fuel infrastructure
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
Amplified Industries
Infrastructure & Construction
AI-driven control solution for oil wells using acoustic signals and edge computing to reduce costs and detect issues
Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals
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.
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
Flux Marine
Transportation & Logistics
Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance
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.