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
Aluminum Technologies
Manufacturing & Processing
Low-GHG primary aluminum production with Carbo-Chloride Reduction
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
REON Technology
Energy & Power
AI-driven optimization of systems through tailored power management of batteries and PV panels for energy storage
Circular Materials
Manufacturing & Processing
Critical raw materials from industrial wastewater
Phlair
Manufacturing & Processing
Renewable-energy-powered DAC system using an electrochemical process for acid and base generation
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
Respire Energy
Energy & Power
Safe, low-cost, and long-duration metal-air battery designed for microgrids
Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market
Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
SWERV
Infrastructure & Construction
Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
WISE ENERGIE
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power
ICODOS
Manufacturing & Processing
Scalable clean methanol to decarbonize transport and chemicals
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
Sublime Systems
Infrastructure & Construction
Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns
Aluminum Technologies
Manufacturing & Processing
Low-GHG primary aluminum production with Carbo-Chloride Reduction
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
REON Technology
Energy & Power
AI-driven optimization of systems through tailored power management of batteries and PV panels for energy storage
Circular Materials
Manufacturing & Processing
Critical raw materials from industrial wastewater
Phlair
Manufacturing & Processing
Renewable-energy-powered DAC system using an electrochemical process for acid and base generation
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
Respire Energy
Energy & Power
Safe, low-cost, and long-duration metal-air battery designed for microgrids
Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market
Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management
Trellis Air
Infrastructure & Construction
Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers
SWERV
Infrastructure & Construction
Making homes healthier, more comfortable, and more energy efficient through reimagined and easy to install ventilation
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
WISE ENERGIE
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power
ICODOS
Manufacturing & Processing
Scalable clean methanol to decarbonize transport and chemicals
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
Sublime Systems
Infrastructure & Construction
Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns
Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors
EnergyGigs
Food, Water, & Land
Talent and freelance platform for the energy industry
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Latitude Media
News, podcasts, market intelligence, and events for the climatetech industry
Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes
SUPERGirls Shine Foundation
Energy & Power
Developing underserved girls in STEM to support equity in the emerging workforce
Solidec
Manufacturing & Processing
Converting carbon into chemicals using only air, water, and renewable electricity
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
SPHINX INC
Energy & Power
High-speed 24/7 energy trading with blockchain clarity and instant settlement
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
Anvil Capture Systems
Manufacturing & Processing
CO2 direct air mineralization process, delivering carbon dioxide removal
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
ATOM-X
Energy & Power
Transforming CO₂ into sustainable fuels like green methanol
Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors
EnergyGigs
Food, Water, & Land
Talent and freelance platform for the energy industry
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Latitude Media
News, podcasts, market intelligence, and events for the climatetech industry
Haystack Ag
Food, Water, & Land
High-accuracy carbon-measurement systems for soil to drive affordable regenerative farming practices
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
DrinKicks
Food, Water, & Land
Repurposing food waste and recycled materials into shoes
SUPERGirls Shine Foundation
Energy & Power
Developing underserved girls in STEM to support equity in the emerging workforce
Solidec
Manufacturing & Processing
Converting carbon into chemicals using only air, water, and renewable electricity
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
SPHINX INC
Energy & Power
High-speed 24/7 energy trading with blockchain clarity and instant settlement
Cemvita
Manufacturing & Processing
Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Conduit Tech
Infrastructure & Construction
Supporting HVAC contractors through design, sales, and installation
Anvil Capture Systems
Manufacturing & Processing
CO2 direct air mineralization process, delivering carbon dioxide removal
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
ATOM-X
Energy & Power
Transforming CO₂ into sustainable fuels like green methanol
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.