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
Candid Intelligence
Infrastructure & Construction
Accelerating pre-construction engineering with Agentic AI
HKG Energy
Energy & Power
Silicon materials that increase battery energy density
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Keysight Technologies (Member Account)
Manufacturing & Processing
World’s leading electronic measurement company
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
FLUIDXLAB Americas Inc.
Manufacturing & Processing
AI-powered microfluidic tools that help control and improve fluid processes across many industries
eSki Watercraft
Energy & Power
Electric personal watercraft
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
Steven Winter Associates, Inc.
Infrastructure & Construction
Research, consulting, and advisory services to improve commercial, residential, and multifamily built environments
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
Glimpse Engineering
Manufacturing & Processing
Visualizing battery scans and continuously monitoring key battery-design features
NeuraliX
Energy & Power
AI solutions to optimize operations and reduce emissions for the energy and manufacturing sectors
Capital Energy
Energy & Power
Helping climatetech companies translate complex work into compelling brands
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Candid Intelligence
Infrastructure & Construction
Accelerating pre-construction engineering with Agentic AI
HKG Energy
Energy & Power
Silicon materials that increase battery energy density
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Keysight Technologies (Member Account)
Manufacturing & Processing
World’s leading electronic measurement company
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
FLUIDXLAB Americas Inc.
Manufacturing & Processing
AI-powered microfluidic tools that help control and improve fluid processes across many industries
eSki Watercraft
Energy & Power
Electric personal watercraft
Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
SpiralWave
Manufacturing & Processing
Low-cost, scalable, high-quality carbon removal using novel electrochemistry
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
HEXAspec
Energy & Power
Thermal management solutions for semiconductor chips, enabling more powerful hardware
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
Steven Winter Associates, Inc.
Infrastructure & Construction
Research, consulting, and advisory services to improve commercial, residential, and multifamily built environments
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
Glimpse Engineering
Manufacturing & Processing
Visualizing battery scans and continuously monitoring key battery-design features
NeuraliX
Energy & Power
AI solutions to optimize operations and reduce emissions for the energy and manufacturing sectors
Capital Energy
Energy & Power
Helping climatetech companies translate complex work into compelling brands
Florrent
Food, Water, & Land
High-energy-density supercapacitors for energy storage, made from domestic biomass waste
Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
rStream Recycling LLC
Manufacturing & Processing
Autonomous waste-sorting system for non-industrial settings with critical waste volumes
BluBridge Energy Solutions
Energy & Power
Removing undesired elements from pre- and post-combustion gas streams
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
Cellen
Transportation & Logistics
Hydrogen-powered drones, combining UAV technology with hydrogen refueling solutions
Geokiln Energy Innovation
Energy & Power
Breakthrough low-cost, low-carbon hydrogen production approach that accelerates natural subsurface mineral reactions
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
3D Architech, Inc.
Manufacturing & Processing
Ultra-fine and gel-based metal manufacturing, creating high-efficiency microstructures for cooling and clean energy
MoveEV
Transportation & Logistics
Mitigating Scope 1 & 3 emissions for businesses while providing cost savings for employees
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
Rafi Properties
Infrastructure & Construction
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
EnergyGigs
Food, Water, & Land
Talent and freelance platform for the energy industry
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Verdicity
Infrastructure & Construction
AI-enabled, customizable smart building, information, and facility services for building vendors
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
rStream Recycling LLC
Manufacturing & Processing
Autonomous waste-sorting system for non-industrial settings with critical waste volumes
BluBridge Energy Solutions
Energy & Power
Removing undesired elements from pre- and post-combustion gas streams
Packwise
Manufacturing & Processing
IIoT sensors combined with a software and analytics platform to optimize industrial supply chains
Cellen
Transportation & Logistics
Hydrogen-powered drones, combining UAV technology with hydrogen refueling solutions
Geokiln Energy Innovation
Energy & Power
Breakthrough low-cost, low-carbon hydrogen production approach that accelerates natural subsurface mineral reactions
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Phase Two Chemicals
Manufacturing & Processing
Advanced electrode and reactor designs for on-site, on-demand chemical generation and energy storage
3D Architech, Inc.
Manufacturing & Processing
Ultra-fine and gel-based metal manufacturing, creating high-efficiency microstructures for cooling and clean energy
MoveEV
Transportation & Logistics
Mitigating Scope 1 & 3 emissions for businesses while providing cost savings for employees
Upgraid RE
Infrastructure & Construction
AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
Rafi Properties
Infrastructure & Construction
PlaSene
Manufacturing & Processing
Converting plastic waste into liquid fuel and low-carbon hydrogen
EnergyGigs
Food, Water, & Land
Talent and freelance platform for the energy industry
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Verdicity
Infrastructure & Construction
AI-enabled, customizable smart building, information, and facility services for building vendors
PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor
Verde Technologies
Energy & Power
Lightweight, flexible perovskite solar panels for mass industrial and commercial adoption
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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.