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
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
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
10DQ
Energy & Power
Battery tech for long-duration energy storage at lower costs and improved safety
Glimpse Engineering
Manufacturing & Processing
Visualizing battery scans and continuously monitoring key battery-design features
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Flight Guard AI
Transportation & Logistics
Pilot-wearable safety systems using human-centered AI to enhance pilot awareness
HarvestAi
Food, Water, & Land
Computer vision and AI to provide greenhouse operators with automated data for optimized harvest planning
Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities
Capwell Services, Inc.
Energy & Power
Capturing methane emissions from oil and gas facilities, specifically low- and intermittent-flow vents
Janta Power
Energy & Power
The world’s first 3D solar tower technology
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes
Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining
Resollant
Manufacturing & Processing
Enables industrial-scale hydrogen & syngas production while capturing carbon as a monetizable solid at scale
Candid Intelligence
Infrastructure & Construction
Accelerating pre-construction engineering with Agentic AI
R&P Employer Solutions
Manufacturing & Processing
HR services, workers compensation, payroll, benefits, and compliance for Houston-area employers
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Octavia Carbon Co
Manufacturing & Processing
Geothermal heat to capture and mineralize CO₂
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
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
10DQ
Energy & Power
Battery tech for long-duration energy storage at lower costs and improved safety
Glimpse Engineering
Manufacturing & Processing
Visualizing battery scans and continuously monitoring key battery-design features
Carbonext
Manufacturing & Processing
3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Flight Guard AI
Transportation & Logistics
Pilot-wearable safety systems using human-centered AI to enhance pilot awareness
HarvestAi
Food, Water, & Land
Computer vision and AI to provide greenhouse operators with automated data for optimized harvest planning
Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities
Capwell Services, Inc.
Energy & Power
Capturing methane emissions from oil and gas facilities, specifically low- and intermittent-flow vents
Janta Power
Energy & Power
The world’s first 3D solar tower technology
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes
Phoenix Tailings
Manufacturing & Processing
Waste-free, net-zero, cost-competitive rare-earth-metal refining
Resollant
Manufacturing & Processing
Enables industrial-scale hydrogen & syngas production while capturing carbon as a monetizable solid at scale
Candid Intelligence
Infrastructure & Construction
Accelerating pre-construction engineering with Agentic AI
R&P Employer Solutions
Manufacturing & Processing
HR services, workers compensation, payroll, benefits, and compliance for Houston-area employers
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Octavia Carbon Co
Manufacturing & Processing
Geothermal heat to capture and mineralize CO₂
change:WATER Labs
Food, Water, & Land
Low-cost, compact, waterless toilet for non-sewered households and communities
Carbion
Manufacturing & Processing
Affordable and clean biomass transformation to graphite for batteries
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
PV Nano Cell
Energy & Power
Advanced nano conductive pastes enabling finer, faster, and more efficient metallization for next-gen solar cells
Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
Aramco Ventures (Member Account)
Energy & Power
Strategic technology-venturing program of Saudi Aramco
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
Keysight Technologies (Member Account)
Manufacturing & Processing
World’s leading electronic measurement company
ClearTrace
Energy & Power
Product suite for traceable, end-to-end data management of electricity and certificate transactions
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Torres Orbital Mining Inc (TOM)
Infrastructure & Construction
Autonomous lunar excavation systems for dust-free regolith mining and space operations
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 […]
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Monaire
Infrastructure & Construction
Reducing HVAC energy use and repair costs for small commercial buildings
change:WATER Labs
Food, Water, & Land
Low-cost, compact, waterless toilet for non-sewered households and communities
Carbion
Manufacturing & Processing
Affordable and clean biomass transformation to graphite for batteries
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
PV Nano Cell
Energy & Power
Advanced nano conductive pastes enabling finer, faster, and more efficient metallization for next-gen solar cells
Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
Aramco Ventures (Member Account)
Energy & Power
Strategic technology-venturing program of Saudi Aramco
A&I Power Group
Energy & Power
Electricity-generation systems that convert electromagnetic energy into electrical potential
Keysight Technologies (Member Account)
Manufacturing & Processing
World’s leading electronic measurement company
ClearTrace
Energy & Power
Product suite for traceable, end-to-end data management of electricity and certificate transactions
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Torres Orbital Mining Inc (TOM)
Infrastructure & Construction
Autonomous lunar excavation systems for dust-free regolith mining and space operations
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 […]
SRGE
Infrastructure & Construction
Full-service accelerator to support small and underrepresented-led construction firms
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Monaire
Infrastructure & Construction
Reducing HVAC energy use and repair costs for small commercial buildings
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.