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
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
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.
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
XMtrace
Manufacturing & Processing
Low-cost methane monitoring with real-time detection and autonomous response
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
Singularity Energy
Energy & Power
Data and software solutions for grid decarbonization
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
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.
BiaTech Corporation
Energy & Power
Energy and natural resource infrastructure immersion with AI-enabled edge and cloud technology
Arbor Energy Holdings Inc
Energy & Power
Digital-energy platform to help homeowners live more sustainably
RIVSAL HOLDINGS INC.
Energy & Power
Power plants that run on water and deliver electricity to avoid grid vulnerability and energy price volatility
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
FAST Metals
Manufacturing & Processing
Hydrometallurgical-recovery process for extracting rare-earth elements from industrial tailings
AeroShield Materials
Infrastructure & Construction
Insulating, porous aerogels for energy-efficient windows
XMtrace
Manufacturing & Processing
Low-cost methane monitoring with real-time detection and autonomous response
Wootz
Manufacturing & Processing
Carbon nanotube supermaterials to replace or augment traditional metallic conductors
Massachusetts Materials Technologies
Energy & Power
Seamlessly measuring the mechanical properties of pipelines without interruption
Mars Materials
Manufacturing & Processing
Converting CO₂ and biomass into acrylonitrile
Transaera
Infrastructure & Construction
Ultra-efficient air conditioning using a novel desiccant material
SpringCycle Energy
Energy & Power
Rechargeable iron fuel to transform solar into baseload power
Beacon Climate Innovations
Energy & Power
Filling gaps between the frontlines of climate change and the emerging technologies that can best address them
Mocean Energy
Energy & Power
Hybrid-offshore renewable power stations, combining wave, solar, and battery systems
Newfound Materials
Manufacturing & Processing
Predictive engine for materials R&D for new pathways to critical minerals
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
Dsider
Energy & Power
SaaS platform to accelerate the expansion of energy-transition projects
Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Eden GeoPower
Energy & Power
Electrical Reservoir Stimulation to enhance subsurface permeability
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
WISE ENERGIE
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power
GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale
Elementa Partners
Infrastructure & Construction
Uniting global talent to unlock high-conviction, institutional-grade investments across Texas growth sectors
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
HKG Energy
Energy & Power
Silicon materials that increase battery energy density
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC
Terralytiq
Manufacturing & Processing
Digital models that deliver Scope 3 hotspots, actionable initiatives, and supplier engagement to cut cost and carbon
Realizse
Energy & Power
Tokenization and product verification for circularity, energy, and the real estate markets
Loop CO2
Manufacturing & Processing
Transforming CO₂ into sustainable polymers to create fully recyclable materials
Rotorvault
Energy & Power
Energy-storage and load-following solutions for grid-scale and commercial applications
Dsider
Energy & Power
SaaS platform to accelerate the expansion of energy-transition projects
Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes
New Mantle Technologies
Energy & Power
Subsurface characterization with physics and AI
Eden GeoPower
Energy & Power
Electrical Reservoir Stimulation to enhance subsurface permeability
CLS Wind
Energy & Power
Self-erecting system for installing wind turbines
LOCOAL
Manufacturing & Processing
Turning waste into value, and producing clean energy, biofuels, and carbon credits
WISE ENERGIE
Energy & Power
Blending vertical-axis wind, solar PV, and battery storage into a single, silent system generating 24/7 clean power
GigaDAC
Energy & Power
Direct air capture optimized for gigaton scale
Elementa Partners
Infrastructure & Construction
Uniting global talent to unlock high-conviction, institutional-grade investments across Texas growth sectors
NOC Energy
Energy & Power
Decarbonizing industrial heat with power-to-heat and power-to-power solutions
Studio 3e8
Manufacturing & Processing
Lightspeed metal 3D printing, making professional-grade fabrication affordable, compact, and easy to use
Endeavor Composites
Manufacturing & Processing
Sustainably repurposing landfill-destined post-industrial fibers into semi-finished goods for the composite industry
HKG Energy
Energy & Power
Silicon materials that increase battery energy density
Clarity Castle
Infrastructure & Construction
Modular, soundproof work pods made from recycled materials
BlueShift Carbon
Manufacturing & Processing
Electrochemical CO₂-removal solution that’s low-cost, energy-efficient, redox-based, and membrane-free
Vertical Semiconductor
Energy & Power
Power supply units designed to unleash the full potential of AI & HPC
Terralytiq
Manufacturing & Processing
Digital models that deliver Scope 3 hotspots, actionable initiatives, and supplier engagement to cut cost and carbon
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.