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
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
EarthEn
Energy & Power
Enabling electrification through CO₂-based thermodynamic cycle
Aluminum Technologies
Manufacturing & Processing
Low-GHG primary aluminum production with Carbo-Chloride Reduction
Rafi Properties
Infrastructure & Construction
ClearTrace
Energy & Power
Product suite for traceable, end-to-end data management of electricity and certificate transactions
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
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.
Tato Labs
Manufacturing & Processing
Bioplastic products and packaging solutions made from potato starch
Sora Fuel Corporation
Transportation & Logistics
Cost-effective sustainable aviation fuel
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Lite-1
Manufacturing & Processing
Clean, scalable, microbe-made colour to replace toxic dyes
NeuroBionics
Manufacturing & Processing
Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Element Resources
Energy & Power
Developing large-scale green hydrogen projects
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
eSki Watercraft
Energy & Power
Electric personal watercraft
Teal Bio
Manufacturing & Processing
Reusable N95 respirator system for healthcare workers to reduce landfill waste
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
EarthEn
Energy & Power
Enabling electrification through CO₂-based thermodynamic cycle
Aluminum Technologies
Manufacturing & Processing
Low-GHG primary aluminum production with Carbo-Chloride Reduction
Rafi Properties
Infrastructure & Construction
ClearTrace
Energy & Power
Product suite for traceable, end-to-end data management of electricity and certificate transactions
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
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.
Tato Labs
Manufacturing & Processing
Bioplastic products and packaging solutions made from potato starch
Sora Fuel Corporation
Transportation & Logistics
Cost-effective sustainable aviation fuel
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Lite-1
Manufacturing & Processing
Clean, scalable, microbe-made colour to replace toxic dyes
NeuroBionics
Manufacturing & Processing
Sustainability-focused device for minimally-invasive endovascular deep-brain stimulation for stroke rehabilitation
Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Element Resources
Energy & Power
Developing large-scale green hydrogen projects
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
eSki Watercraft
Energy & Power
Electric personal watercraft
Teal Bio
Manufacturing & Processing
Reusable N95 respirator system for healthcare workers to reduce landfill waste
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
Titan Advanced Energy Solutions
Energy & Power
Advanced battery management systems for lithium-ion batteries
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Cala Systems
Energy & Power
Intelligent heat-pump water heaters
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination
AllSpice.io
Infrastructure & Construction
A collaboration hub for hardware teams with revision control, design reviews, and releases
American Battery Technology Company
Energy & Power
Advanced technology, first-mover lithium-ion battery recycling and primary battery metal extraction company
Matterworks
Manufacturing & Processing
Enabling metabolomics assays that are fast, broad, and can characterize diverse chemical classes with a single setup
Datavedik
Energy & Power
Addressing complex optimization challenges in the energy industry
Rushnu
Manufacturing & Processing
Turns waste into carbon-neutral chemistry
GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale
Swan Impact Network
Infrastructure & Construction
Angel investor network focusing on supporting early-stage companies
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
Titan Advanced Energy Solutions
Energy & Power
Advanced battery management systems for lithium-ion batteries
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Carbon To Stone
Energy & Power
Carbon-mineralization technology with high-value minerals and metals recovery
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Cala Systems
Energy & Power
Intelligent heat-pump water heaters
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination
AllSpice.io
Infrastructure & Construction
A collaboration hub for hardware teams with revision control, design reviews, and releases
American Battery Technology Company
Energy & Power
Advanced technology, first-mover lithium-ion battery recycling and primary battery metal extraction company
Matterworks
Manufacturing & Processing
Enabling metabolomics assays that are fast, broad, and can characterize diverse chemical classes with a single setup
Datavedik
Energy & Power
Addressing complex optimization challenges in the energy industry
Rushnu
Manufacturing & Processing
Turns waste into carbon-neutral chemistry
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.