Helping entrepreneursTransformindustry

Greentown member working in a wet lab
Greentown community members collaborating
Greentown member pipetting in a lab
Greentown members at work in the incubator
[ 01 ]Who We Are

Breakthroughs don't scale in isolation.

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.

Our Vision

Greentown is a 501(c)(3) non-profit organization

[ 03 ]Our Startups

Our Member Companies

View All Startups
Phoenix Tailings logo

Phoenix Tailings

Manufacturing & Processing

Waste-free, net-zero, cost-competitive rare-earth-metal refining

frakktal logo

frakktal

Manufacturing & Processing

Biobased polymer process to upend PVC overuse

Elementium Materials logo

Elementium Materials

Energy & Power

Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

Sparkplug Power logo

Sparkplug Power

Energy & Power

Energy-storage-as-a-service for municipal utilities and commercial businesses

Biospheric AI logo

Biospheric AI

Energy & Power

High-resolution, building-level energy demand forecasts for utilities and more

Mocean Energy logo

Mocean Energy

Energy & Power

Hybrid-offshore renewable power stations, combining wave, solar, and battery systems

Innovator Energy logo

Innovator Energy

Energy & Power

Developing and deploying solutions in cooling, heating, and heat transfer

Arbon logo

Arbon

Energy & Power

Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization

Onvector logo

Onvector

Infrastructure & Construction

Non-chemical water treatment using plasma to rid water of PFAS and more

Trellis Air logo

Trellis Air

Infrastructure & Construction

Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

GeoTeknica logo

GeoTeknica

Manufacturing & Processing

SRECTrade logo

SRECTrade

Energy & Power

Management and transaction platform for environmental commodities to reduce costs and increase transparency

Flux Marine logo

Flux Marine

Transportation & Logistics

Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance

Saint-Gobain (Member Account) logo

Saint-Gobain (Member Account)

Infrastructure & Construction

Worldwide leader in light and sustainable construction

Lasso Labs logo

Lasso Labs

Food, Water, & Land

Using natural proteins to create real texture in alternative foods

Manatee Energy logo

Manatee Energy

Infrastructure & Construction

Rigorous and automated system design for affordable home heat pumps

Circulus Air logo

Circulus Air

Infrastructure & Construction

Clean air systems to directly remove harmful gases and pollutants

Solidec logo

Solidec

Manufacturing & Processing

Converting carbon into chemicals using only air, water, and renewable electricity

Kanin Energy logo

Kanin Energy

Energy & Power

Monetizing industrial waste heat with reduced deployment risk via third-party financing

Phoenix Tailings logo

Phoenix Tailings

Manufacturing & Processing

Waste-free, net-zero, cost-competitive rare-earth-metal refining

frakktal logo

frakktal

Manufacturing & Processing

Biobased polymer process to upend PVC overuse

Elementium Materials logo

Elementium Materials

Energy & Power

Battery-electrolyte technology that unlocks affordable, lightweight, long-lasting, intrinsically safe batteries

Sparkplug Power logo

Sparkplug Power

Energy & Power

Energy-storage-as-a-service for municipal utilities and commercial businesses

Biospheric AI logo

Biospheric AI

Energy & Power

High-resolution, building-level energy demand forecasts for utilities and more

Mocean Energy logo

Mocean Energy

Energy & Power

Hybrid-offshore renewable power stations, combining wave, solar, and battery systems

Innovator Energy logo

Innovator Energy

Energy & Power

Developing and deploying solutions in cooling, heating, and heat transfer

Arbon logo

Arbon

Energy & Power

Low energy humidity-driven modular tech capturing and releasing CO2 for practical decarbonization

Onvector logo

Onvector

Infrastructure & Construction

Non-chemical water treatment using plasma to rid water of PFAS and more

Trellis Air logo

Trellis Air

Infrastructure & Construction

Membrane-based dehumidifiers that are vastly more energy-efficient than desiccant wheels and standalone dehumidifiers

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

GeoTeknica logo

GeoTeknica

Manufacturing & Processing

SRECTrade logo

SRECTrade

Energy & Power

Management and transaction platform for environmental commodities to reduce costs and increase transparency

Flux Marine logo

Flux Marine

Transportation & Logistics

Outboard motors and complete boat packages characterized by low maintenance, long range, and outstanding performance

Saint-Gobain (Member Account) logo

Saint-Gobain (Member Account)

Infrastructure & Construction

Worldwide leader in light and sustainable construction

Lasso Labs logo

Lasso Labs

Food, Water, & Land

Using natural proteins to create real texture in alternative foods

Manatee Energy logo

Manatee Energy

Infrastructure & Construction

Rigorous and automated system design for affordable home heat pumps

Circulus Air logo

Circulus Air

Infrastructure & Construction

Clean air systems to directly remove harmful gases and pollutants

Solidec logo

Solidec

Manufacturing & Processing

Converting carbon into chemicals using only air, water, and renewable electricity

Kanin Energy logo

Kanin Energy

Energy & Power

Monetizing industrial waste heat with reduced deployment risk via third-party financing

Upgraid RE logo

Upgraid RE

Infrastructure & Construction

AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals

Ensovi logo

Ensovi

Manufacturing & Processing

Cofactor recycling platform for sustainable drug manufacturing

HEXAspec logo

HEXAspec

Energy & Power

Thermal management solutions for semiconductor chips, enabling more powerful hardware

SRGE logo

SRGE

Infrastructure & Construction

Full-service accelerator to support small and underrepresented-led construction firms

SkyH2O logo

SkyH2O

Food, Water, & Land

Atmospheric water generation for commercial and government projects

Carbonext logo

Carbonext

Manufacturing & Processing

3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes

TransOceans Clean Energy Risk, LLC logo

TransOceans Clean Energy Risk, LLC

Energy & Power

Risk management solutions for global clean tech risk portfolios

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

RIVSAL HOLDINGS INC. logo

RIVSAL HOLDINGS INC.

Energy & Power

Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility

Prithvi Ventures logo

Prithvi Ventures

Investing in startups reducing emissions with unique solutions for net-zero goals

Active Surfaces logo

Active Surfaces

Energy & Power

Flexible, lightweight solar panels that turn any surface into solar

Cemvita logo

Cemvita

Manufacturing & Processing

Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop

ONEPREDICT logo

ONEPREDICT

Manufacturing & Processing

Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries

MCatalysis logo

MCatalysis

Manufacturing & Processing

Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology

Powerhouse Ventures logo

Powerhouse Ventures

Infrastructure & Construction

Investing in software to advance clean energy, mobility, and industry

Hera Materials logo

Hera Materials

Manufacturing & Processing

Regenerative plastics made from diverse, local biomass, powered by robotics and AI

Onboard Data logo

Onboard Data

Infrastructure & Construction

Onboard — offers software analytics for HVAC service providers.

Conduit Tech logo

Conduit Tech

Infrastructure & Construction

Supporting HVAC contractors through design, sales, and installation

InnoEnergy (Member Account) logo

InnoEnergy (Member Account)

Energy & Power

Industrializing cleantech innovation to enable and grow a global net-zero economy

Zero Homes logo

Zero Homes

Infrastructure & Construction

Automated assessment, design, and procurement platform for residential building retrofits

Upgraid RE logo

Upgraid RE

Infrastructure & Construction

AI and satellite data that diagnose buildings and run energy simulations, to produce ready-to-pitch upgrade proposals

Ensovi logo

Ensovi

Manufacturing & Processing

Cofactor recycling platform for sustainable drug manufacturing

HEXAspec logo

HEXAspec

Energy & Power

Thermal management solutions for semiconductor chips, enabling more powerful hardware

SRGE logo

SRGE

Infrastructure & Construction

Full-service accelerator to support small and underrepresented-led construction firms

SkyH2O logo

SkyH2O

Food, Water, & Land

Atmospheric water generation for commercial and government projects

Carbonext logo

Carbonext

Manufacturing & Processing

3D-graphene technology that develops integrated solutions with carbon-coated silicon anodes

TransOceans Clean Energy Risk, LLC logo

TransOceans Clean Energy Risk, LLC

Energy & Power

Risk management solutions for global clean tech risk portfolios

Boxes logo

Boxes

Manufacturing & Processing

Smart, affordable, and sustainable retail combining the physical and digital worlds

RIVSAL HOLDINGS INC. logo

RIVSAL HOLDINGS INC.

Energy & Power

Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility

Prithvi Ventures logo

Prithvi Ventures

Investing in startups reducing emissions with unique solutions for net-zero goals

Active Surfaces logo

Active Surfaces

Energy & Power

Flexible, lightweight solar panels that turn any surface into solar

Cemvita logo

Cemvita

Manufacturing & Processing

Engineered microbes to transform CO₂ and other wastes into valuable compounds, closing the carbon and waste loop

ONEPREDICT logo

ONEPREDICT

Manufacturing & Processing

Predicting and diagnosing the status of key industrial assets for the energy and manufacturing industries

MCatalysis logo

MCatalysis

Manufacturing & Processing

Converting waste carbon into low-cost clean fuels with advanced microwave and catalyst technology

Powerhouse Ventures logo

Powerhouse Ventures

Infrastructure & Construction

Investing in software to advance clean energy, mobility, and industry

Hera Materials logo

Hera Materials

Manufacturing & Processing

Regenerative plastics made from diverse, local biomass, powered by robotics and AI

Onboard Data logo

Onboard Data

Infrastructure & Construction

Onboard — offers software analytics for HVAC service providers.

Conduit Tech logo

Conduit Tech

Infrastructure & Construction

Supporting HVAC contractors through design, sales, and installation

InnoEnergy (Member Account) logo

InnoEnergy (Member Account)

Energy & Power

Industrializing cleantech innovation to enable and grow a global net-zero economy

Zero Homes logo

Zero Homes

Infrastructure & Construction

Automated assessment, design, and procurement platform for residential building retrofits

[ 04 ]By The Numbers

Our Impact

Our members aren't just building better ways to operate; they're slashing emissions, boosting efficiency, and transforming how we use resources across the world. Now 15 years and counting, the impact speaks for itself.
Capital Mobilized

Our Startups Have Raised Over $0B

2011Now
Startups Supported

All-time

0

Currently home to

0

Global Footprint

0+

Countries Where
Startups Operate

Jobs Created

12,915 new jobs created by our members, and counting

Boston

7,492

Houston

5,423

[ 05 ]Our Partners

Where Industry Meets Innovation

Startups bring the breakthroughs. Corporate partners bring the scale, infrastructure, expertise, and capital to make them matter.

  • Amazon
  • Amrize
  • Aramco
  • BCG
  • Chevron
  • Dassault Systemes
  • Emerson
  • Enel
  • Equinor
  • Foley Hoag
  • Fortescue
  • GeSI
  • GE Vernova
  • Microsoft
  • OnTerris (fka Montrose)
  • Saint-Gobain
  • Shell
  • TotalEnergies
  • Vinson & Elkins
  • Woodside Energy
For Startups

Apply for Membership

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.

Greentown member prototyping hardware in the lab
For Partners
Greentown partners networking at an event

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.

Explore Partnership
Events
Speaker presenting on stage at a Greentown event

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.

View Calendar
Programs
Two Greentown program participants in the lab

Learn About our Programs

In addition to our Boston and Houston incubators, Greentown runs programs designed to address critical challenges in the climatetech ecosystem.

Explore Programs