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

ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries

PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor

Andros Innovations
Manufacturing & Processing
Reducing the costs and energy demands of ammonia production through advanced reactor technology

Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar

Element Resources
Energy & Power
Developing large-scale green hydrogen projects

Helix Earth Technologies
Infrastructure & Construction
Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

Helium Capital
Infrastructure & Construction
Supporting growing small businesses

Kauel
Energy & Power
Software that detects industrial threats to prevent environmental risks and catastrophes

Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits

Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps

SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers

Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers

Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction

Tato Labs
Manufacturing & Processing
Bioplastic products and packaging solutions made from potato starch

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

Teknobuilt
Infrastructure & Construction
Cloud-based construction project management software

R&P Employer Solutions
Manufacturing & Processing
HR services, workers compensation, payroll, benefits, and compliance for Houston-area employers

Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors

Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings

Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen

ONEPREDICT
Manufacturing & Processing
Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries

PooPoof Inc
Food, Water, & Land
The world’s first pocket-sized bioreactor

Andros Innovations
Manufacturing & Processing
Reducing the costs and energy demands of ammonia production through advanced reactor technology

Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar

Element Resources
Energy & Power
Developing large-scale green hydrogen projects

Helix Earth Technologies
Infrastructure & Construction
Improving energy efficiency and minimizing emissions through a droplet-capture filtration system

Helium Capital
Infrastructure & Construction
Supporting growing small businesses

Kauel
Energy & Power
Software that detects industrial threats to prevent environmental risks and catastrophes

Zero Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits

Manatee Energy
Infrastructure & Construction
Rigorous and automated system design for affordable home heat pumps

SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers

Peak Power
Energy & Power
Energy-storage optimization software for commercial and industrial customers and energy storage project developers

Saint-Gobain (Member Account)
Infrastructure & Construction
Worldwide leader in light and sustainable construction

Tato Labs
Manufacturing & Processing
Bioplastic products and packaging solutions made from potato starch

Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption

Teknobuilt
Infrastructure & Construction
Cloud-based construction project management software

R&P Employer Solutions
Manufacturing & Processing
HR services, workers compensation, payroll, benefits, and compliance for Houston-area employers

Daniel Consulting Group, LLC
Energy & Power
Helping researchers improve battery and cell testing and providing due diligence for potential investors

Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings

Ivys Energy Solutions
Energy & Power
On-site hydrogen-generation and -dispensing appliance that uses water and electricity to make fuel-cell-grade hydrogen

Climative
Energy & Power
AI-assisted home-energy assessments deployed in an interactive, web-based platform

Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination

Solar Materials
Energy & Power
Recovered and recycled secondary solar panel materials

Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market

Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets

Agrilab Technologies Inc.
Food, Water, & Land
Modular compost-aeration and heat-recovery systems

Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities

Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more

Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen

Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era

Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds

Aeromine Technologies, Inc.
Energy & Power
Bladeless, motionless wind turbines for the built environment

Capro-X
Food, Water, & Land
Sustainable biochemicals made from food waste at food production plants, creating alternatives to palm-oil chemicals

Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers

Cala Systems
Energy & Power
Intelligent heat-pump water heaters

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

KP Labs
Manufacturing & Processing
Modular, biomembrane-based systems for on-site recovery of critical metals from e-waste and industrial residues

Clear Sky Innovations
Manufacturing & Processing
A physics-based, AI-powered geoscience platform that uses multi-modal data sets to minimize time spent on data wrangling

Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors

Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets

Climative
Energy & Power
AI-assisted home-energy assessments deployed in an interactive, web-based platform

Harmony Desalting
Food, Water, & Land
Batch-process reverse osmosis for low-cost water desalination

Solar Materials
Energy & Power
Recovered and recycled secondary solar panel materials

Ohm Analytics
Energy & Power
Aggregating clean energy data based on thousands of sources for visibility and intelligence in the U.S. solar market

Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets

Agrilab Technologies Inc.
Food, Water, & Land
Modular compost-aeration and heat-recovery systems

Browning the Green Space
Food, Water, & Land
Addressing diversity, equity, and inclusion across careers, companies, contracts, capital, and communities

Biospheric AI
Energy & Power
High-resolution, building-level energy demand forecasts for utilities and more

Electric Hydrogen
Energy & Power
Manufactureing the world’s most powerful electrolyzers to produce the lowest cost clean hydrogen

Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era

Boxes
Manufacturing & Processing
Smart, affordable, and sustainable retail combining the physical and digital worlds

Aeromine Technologies, Inc.
Energy & Power
Bladeless, motionless wind turbines for the built environment

Capro-X
Food, Water, & Land
Sustainable biochemicals made from food waste at food production plants, creating alternatives to palm-oil chemicals

Laminar
Manufacturing & Processing
IoT platform optimizing industrial liquid and fluid systems in supply chain, manufacturing, and data centers

Cala Systems
Energy & Power
Intelligent heat-pump water heaters

Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals

KP Labs
Manufacturing & Processing
Modular, biomembrane-based systems for on-site recovery of critical metals from e-waste and industrial residues

Clear Sky Innovations
Manufacturing & Processing
A physics-based, AI-powered geoscience platform that uses multi-modal data sets to minimize time spent on data wrangling

Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors

Vecarius
Infrastructure & Construction
Heat-to-electricity technology to boost energy efficiency in mass markets
Our Startups Have Raised Over $0B
All-time
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Currently home to
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Countries Where
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.























