Helping climatetech startupsTransformindustry

[ 02 ]Our Startups

Our Member Companies

View All Startups
FutureOn logo

FutureOn

Energy & Power

FutureOn — FutureOn's FieldTwin creates a dynamic and 3D geospatial common data environment across surface, subsea, and subsurface domains, with open API connectivity into third-party tools and existing customer workflows.

Clarity Castle logo

Clarity Castle

Infrastructure & Construction

Modular, soundproof work pods made from recycled materials

Inovues logo

Inovues

Infrastructure & Construction

enaDyne logo

enaDyne

Manufacturing & Processing

enaDyne — develops non-thermal plasma catalysis reactors to convert CO2 into chemicals and fuels.

Respire Energy logo

Respire Energy

Energy & Power

Safe, low-cost, and long-duration metal-air battery designed for microgrids

Highland Park Technologies logo

Highland Park Technologies

Infrastructure & Construction

Insulated cladding and building envelope retrofits at a fraction of the cost

Monaire logo

Monaire

Infrastructure & Construction

Reducing HVAC energy use and repair costs for small commercial buildings

Boronite logo

Boronite

Manufacturing & Processing

Titan Advanced Energy Solutions logo

Titan Advanced Energy Solutions

Energy & Power

Advanced battery management systems for lithium-ion batteries

Cemvita logo

Cemvita

Manufacturing & Processing

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

Global Algae Innovations logo

Global Algae Innovations

Transportation & Logistics

Global Algae Innovations — grows algae that capture CO2 from the atmosphere to produce protein and oil for food and industrial use.

SpringCycle Energy logo

SpringCycle Energy

Energy & Power

Rechargeable iron fuel to transform solar into baseload power

Reverse Energy Solutions logo

Reverse Energy Solutions

Transportation & Logistics

Our startup implements innovative mobile solutions for solar panel recycling, drastically reducing logistic costs by 90% through streamlined collection and transportation processes.

Mocean Energy logo

Mocean Energy

Energy & Power

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

AeroShield Materials logo

AeroShield Materials

Infrastructure & Construction

Insulating, porous aerogels for energy-efficient windows

Sweetch Energy logo

Sweetch Energy

Energy & Power

Membrane-based technology that taps into osmotic power

Sealed logo

Sealed

Infrastructure & Construction

Climate Core Capital logo

Climate Core Capital

Infrastructure & Construction

Climate Core — runs a climate-oriented real estate strategy, namely acquiring buildings in low climate risk locations and making those buildings the most resilient in the built environment.

Terrapin Geothermics logo

Terrapin Geothermics

Energy & Power

Terrapin Geothermics — develops energy projects that reduce the emissions intensity of the industrial sectors.

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

FutureOn logo

FutureOn

Energy & Power

FutureOn — FutureOn's FieldTwin creates a dynamic and 3D geospatial common data environment across surface, subsea, and subsurface domains, with open API connectivity into third-party tools and existing customer workflows.

Clarity Castle logo

Clarity Castle

Infrastructure & Construction

Modular, soundproof work pods made from recycled materials

Inovues logo

Inovues

Infrastructure & Construction

enaDyne logo

enaDyne

Manufacturing & Processing

enaDyne — develops non-thermal plasma catalysis reactors to convert CO2 into chemicals and fuels.

Respire Energy logo

Respire Energy

Energy & Power

Safe, low-cost, and long-duration metal-air battery designed for microgrids

Highland Park Technologies logo

Highland Park Technologies

Infrastructure & Construction

Insulated cladding and building envelope retrofits at a fraction of the cost

Monaire logo

Monaire

Infrastructure & Construction

Reducing HVAC energy use and repair costs for small commercial buildings

Boronite logo

Boronite

Manufacturing & Processing

Titan Advanced Energy Solutions logo

Titan Advanced Energy Solutions

Energy & Power

Advanced battery management systems for lithium-ion batteries

Cemvita logo

Cemvita

Manufacturing & Processing

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

Global Algae Innovations logo

Global Algae Innovations

Transportation & Logistics

Global Algae Innovations — grows algae that capture CO2 from the atmosphere to produce protein and oil for food and industrial use.

SpringCycle Energy logo

SpringCycle Energy

Energy & Power

Rechargeable iron fuel to transform solar into baseload power

Reverse Energy Solutions logo

Reverse Energy Solutions

Transportation & Logistics

Our startup implements innovative mobile solutions for solar panel recycling, drastically reducing logistic costs by 90% through streamlined collection and transportation processes.

Mocean Energy logo

Mocean Energy

Energy & Power

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

AeroShield Materials logo

AeroShield Materials

Infrastructure & Construction

Insulating, porous aerogels for energy-efficient windows

Sweetch Energy logo

Sweetch Energy

Energy & Power

Membrane-based technology that taps into osmotic power

Sealed logo

Sealed

Infrastructure & Construction

Climate Core Capital logo

Climate Core Capital

Infrastructure & Construction

Climate Core — runs a climate-oriented real estate strategy, namely acquiring buildings in low climate risk locations and making those buildings the most resilient in the built environment.

Terrapin Geothermics logo

Terrapin Geothermics

Energy & Power

Terrapin Geothermics — develops energy projects that reduce the emissions intensity of the industrial sectors.

New Mantle Technologies logo

New Mantle Technologies

Energy & Power

Subsurface characterization with physics and AI

NOC Energy logo

NOC Energy

Energy & Power

Decarbonizing industrial heat with power-to-heat and power-to-power solutions

Harmony Desalting logo

Harmony Desalting

Food, Water, & Land

Batch reverse osmosis process for low-cost water desalination

SICDrone logo

SICDrone

Transportation & Logistics

Sublime Systems logo

Sublime Systems

Infrastructure & Construction

Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns

Timbergrove logo

Timbergrove

Energy & Power

Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency

Pecos Wind Power logo

Pecos Wind Power

Energy & Power

Pecos Wind Power — is reducing the cost of distributed wind power through the development of an 85kW community-scale wind turbine.

Soliyarn logo

Soliyarn

Manufacturing & Processing

Soliyarn — employs a unique (dry) process to vapor coat polymers on textiles, which leads to washable electronic clothing without wires or bulk.

Cala Systems logo

Cala Systems

Energy & Power

Intelligent heat-pump water heaters

Provocative logo

Provocative

Manufacturing & Processing

Replacing data centers’ cooling systems with carbon capture

Felixfusion logo

Felixfusion

Spaero Bio logo

Spaero Bio

Infrastructure & Construction

Spaero Bio — enables scientists to quickly and directly automate experiments that are currently done by hand, a bottleneck of life science R&D.

Heartland Industries logo

Heartland Industries

Manufacturing & Processing

Corumat logo

Corumat

Manufacturing & Processing

Transport Phenomena Technologies logo

Transport Phenomena Technologies

Manufacturing & Processing

Transport Phenomena Technologies — models software for thermal management of electronics.

DASH Clean Energy logo

DASH Clean Energy

Energy & Power

Dash Clean Energy — has developed a hydrogen simulation tool that can be used by developers to evaluate existing and planned wind and solar projects and how to manage and produce hydrogen cost competitively with existing hydrogen production pathways.

Sensible logo

Sensible

Energy & Power

Compact, refrigerant-free thermoelectric heat pump for quiet, efficient, climate-neutral HVAC

Excipio Energy logo

Excipio Energy

Energy & Power

Excipio Energy — is an offshore renewable energy company integrating wind, wave, currents, OTEC, and power-to-fuel in a single floating platform.

Next Rung Technology logo

Next Rung Technology

Manufacturing & Processing

Supporting clean technologies in their commercialization journeys with expert engineering consulting

Enerbrain logo

Enerbrain

Infrastructure & Construction

Hunt Energy Enterprises logo

Hunt Energy Enterprises

Energy & Power

NOC Energy logo

NOC Energy

Energy & Power

Decarbonizing industrial heat with power-to-heat and power-to-power solutions

Harmony Desalting logo

Harmony Desalting

Food, Water, & Land

Batch reverse osmosis process for low-cost water desalination

SICDrone logo

SICDrone

Transportation & Logistics

Sublime Systems logo

Sublime Systems

Infrastructure & Construction

Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns

Timbergrove logo

Timbergrove

Energy & Power

Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency

Pecos Wind Power logo

Pecos Wind Power

Energy & Power

Pecos Wind Power — is reducing the cost of distributed wind power through the development of an 85kW community-scale wind turbine.

Soliyarn logo

Soliyarn

Manufacturing & Processing

Soliyarn — employs a unique (dry) process to vapor coat polymers on textiles, which leads to washable electronic clothing without wires or bulk.

Cala Systems logo

Cala Systems

Energy & Power

Intelligent heat-pump water heaters

Provocative logo

Provocative

Manufacturing & Processing

Replacing data centers’ cooling systems with carbon capture

Felixfusion logo

Felixfusion

Spaero Bio logo

Spaero Bio

Infrastructure & Construction

Spaero Bio — enables scientists to quickly and directly automate experiments that are currently done by hand, a bottleneck of life science R&D.

Heartland Industries logo

Heartland Industries

Manufacturing & Processing

Corumat logo

Corumat

Manufacturing & Processing

Transport Phenomena Technologies logo

Transport Phenomena Technologies

Manufacturing & Processing

Transport Phenomena Technologies — models software for thermal management of electronics.

DASH Clean Energy logo

DASH Clean Energy

Energy & Power

Dash Clean Energy — has developed a hydrogen simulation tool that can be used by developers to evaluate existing and planned wind and solar projects and how to manage and produce hydrogen cost competitively with existing hydrogen production pathways.

Sensible logo

Sensible

Energy & Power

Compact, refrigerant-free thermoelectric heat pump for quiet, efficient, climate-neutral HVAC

Excipio Energy logo

Excipio Energy

Energy & Power

Excipio Energy — is an offshore renewable energy company integrating wind, wave, currents, OTEC, and power-to-fuel in a single floating platform.

Next Rung Technology logo

Next Rung Technology

Manufacturing & Processing

Supporting clean technologies in their commercialization journeys with expert engineering consulting

Enerbrain logo

Enerbrain

Infrastructure & Construction

Hunt Energy Enterprises logo

Hunt Energy Enterprises

Energy & Power

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

Greentown is a 501(c)(3) nonprofit helping climate entrepreneurs build faster.

The way the world makes energy, materials, and food is changing — and the next decade will decide whether that change makes life better: more energy with fewer emissions, more industry with cleaner air, more good jobs.

That future comes from entrepreneurs — the heroes who turn ideas into real products, real companies, and the jobs of the future. And the ones who make it are the ones with a community behind them.

For 15 years, Greentown has been that community — leaning in with the space, the people, the funding, and the first customers they need. Get behind the entrepreneurs building our future.

[ 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

0

New Jobs Created by Our Members, and Counting

[ 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
  • 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
For Investors
Founders and investors connecting at a Greentown incubator

Explore Investing

Tap into deal flow with the world’s largest community of climate and energy startups.

Explore Investing