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
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
Solas Capture
Solas Capture is developing a sunlight-powered process for sustainable lithium carbonate production using novel photobase chemistry. Our technology converts lithium brines and CO₂ into battery-grade materials with lower energy use, reduced waste, and a significantly smaller environmental footprint than conventional methods.
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities
QEA Tech
Energy & Power
Precise, data-driven building-envelope audits using patented AI software, drones, and thermography
Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
Anning Corporation
Energy & Power
Targeting iron-rich rocks to produce hydrogen
Reframe Systems
Infrastructure & Construction
Offsite construction of zero-carbon buildings with volumetric modules manufactured with robotic microfactories
ICODOS
Manufacturing & Processing
Scalable clean methanol to decarbonize transport and chemicals
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
Janta Power
Energy & Power
The world’s first 3D solar tower technology
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
XMtrace
Manufacturing & Processing
Low-cost methane monitoring with real-time detection and autonomous response
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
Thalon Materials
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
Solas Capture
Solas Capture is developing a sunlight-powered process for sustainable lithium carbonate production using novel photobase chemistry. Our technology converts lithium brines and CO₂ into battery-grade materials with lower energy use, reduced waste, and a significantly smaller environmental footprint than conventional methods.
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities
QEA Tech
Energy & Power
Precise, data-driven building-envelope audits using patented AI software, drones, and thermography
Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets
Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
Anning Corporation
Energy & Power
Targeting iron-rich rocks to produce hydrogen
Reframe Systems
Infrastructure & Construction
Offsite construction of zero-carbon buildings with volumetric modules manufactured with robotic microfactories
ICODOS
Manufacturing & Processing
Scalable clean methanol to decarbonize transport and chemicals
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
Janta Power
Energy & Power
The world’s first 3D solar tower technology
Onvector
Infrastructure & Construction
Non-chemical water treatment using plasma to rid water of PFAS and more
XMtrace
Manufacturing & Processing
Low-cost methane monitoring with real-time detection and autonomous response
Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds
Thalon Materials
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
Cella Mineral Storage
Manufacturing & Processing
Turning volcanic formations into reliable, low-cost CO₂ storage
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Latitude Media
News, podcasts, market intelligence, and events for the climatetech industry
Aeromine Technologies, Inc.
Energy & Power
Bladeless, motionless wind turbines for the built environment
ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries
Optigon
Energy & Power
Rapid, contactless characterization for assessing performance during photovoltaic solar cell fabrication
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
Rafi Properties
Infrastructure & Construction
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
AllSpice.io
Infrastructure & Construction
A collaboration hub for hardware teams with revision control, design reviews, and releases
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage
Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
Intention
Energy & Power
Climate-infrastructure-investment platform
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
Kauel
Energy & Power
Software that detects industrial threats to prevent environmental risks and catastrophes
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Latitude Media
News, podcasts, market intelligence, and events for the climatetech industry
Aeromine Technologies, Inc.
Energy & Power
Bladeless, motionless wind turbines for the built environment
ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries
Optigon
Energy & Power
Rapid, contactless characterization for assessing performance during photovoltaic solar cell fabrication
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
Rafi Properties
Infrastructure & Construction
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
AllSpice.io
Infrastructure & Construction
A collaboration hub for hardware teams with revision control, design reviews, and releases
Enel (Member Account)
Energy & Power
One of the world’s leading integrated utilities and the largest private producer of clean energy
Ententia
Energy & Power
Trusted, scalable enterprise AI solutions that turn context into competitive advantage
Arbon
Energy & Power
Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
Intention
Energy & Power
Climate-infrastructure-investment platform
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
Kauel
Energy & Power
Software that detects industrial threats to prevent environmental risks and catastrophes
Powerhouse Ventures
Infrastructure & Construction
Investing in software to advance clean energy, mobility, and industry
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.