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
Raptor Maps
Energy & Power
AI software to increase solar farm power production, reduce operational risk, and lower costs
Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Elemental Advanced Materials
Manufacturing & Processing
Graphene and hydrogen from mixed and contaminated waste plastics and other organic materials
Atlas Robotics
Transportation & Logistics
Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
Corrolytics
Energy & Power
Corrosion detection through electrochemical innovation, integrated with advanced AI technology
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
Matterworks
Manufacturing & Processing
Enabling metabolomics assays that are fast, broad, and can characterize diverse chemical classes with a single setup
NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
BLU NXT
Energy & Power
Solar concentrators for high-temperature heat and energy
BluBridge Energy Solutions
Energy & Power
Removing undesired elements from pre- and post-combustion gas streams
Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
COI Energy
Energy & Power
AI and machine learning to predict and prevent energy waste
Raptor Maps
Energy & Power
AI software to increase solar farm power production, reduce operational risk, and lower costs
Dandelion Energy
Infrastructure & Construction
Geothermal heating and cooling systems for homes
Active Surfaces
Energy & Power
Flexible, lightweight solar panels that turn any surface into solar
Circulus Air
Infrastructure & Construction
Clean air systems to directly remove harmful gases and pollutants
Emrod
Energy & Power
Sustainable power with long-range wireless power transfer technology
Elemental Advanced Materials
Manufacturing & Processing
Graphene and hydrogen from mixed and contaminated waste plastics and other organic materials
Atlas Robotics
Transportation & Logistics
Mission Zero Technologies
Manufacturing & Processing
Efficient electrochemistry to capture CO₂
Sweetch Energy
Energy & Power
Membrane-based technology that taps into osmotic power
Corrolytics
Energy & Power
Corrosion detection through electrochemical innovation, integrated with advanced AI technology
Alma Energy
Energy & Power
Geothermal exploration to deliver scaled renewable energy production at economic levels
SolarKal
Energy & Power
The largest solar energy marketplace in the U.S., connecting organizations to solar providers
Matterworks
Manufacturing & Processing
Enabling metabolomics assays that are fast, broad, and can characterize diverse chemical classes with a single setup
NONA Technologies
Food, Water, & Land
Desalinating brackish water with 60% less electricity, fewer chemical inputs, and less downtime
String Data Motion
Infrastructure & Construction
Agentic AI for energy companies. Agents in motion. Outcomes delivered.
BLU NXT
Energy & Power
Solar concentrators for high-temperature heat and energy
BluBridge Energy Solutions
Energy & Power
Removing undesired elements from pre- and post-combustion gas streams
Thola
Energy & Power
On-demand marketplace for commercial building sustainability and safety management
SRECTrade
Energy & Power
Management and transaction platform for environmental commodities to reduce costs and increase transparency
COI Energy
Energy & Power
AI and machine learning to predict and prevent energy waste
Clean Crop Technologies
Food, Water, & Land
Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
Priority Investor Loans
Infrastructure & Construction
Simplified loan programs to fund real estate investors nationwide with income-producing properties
Dsider
Energy & Power
SaaS platform to accelerate the expansion of energy-transition projects
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Overstory
Food, Water, & Land
Minimizing vegetation contact with power lines using satellite imagery, climate data, and machine learning
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Provocative
Manufacturing & Processing
Replacing data centers’ cooling systems with carbon capture
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals
EQORE
EQORE is an end-to-end provider of intelligent and autonomous energy storage for commercial and industrial facilities, aimed at minimizing their electricity costs. By offering unprecedented ROIs, EQORE makes adding distributed storage to the grid financially attractive, promoting grid resilience while supporting businesses.
Sublime Systems
Infrastructure & Construction
Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
ZERO Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
Clean Crop Technologies
Food, Water, & Land
Improving food safety and reducing food waste by removing contaminants with food-grade gasses and electricity
Swiss Vault
Manufacturing & Processing
Revolutionizing Data Infrastructure for the AI Era
Priority Investor Loans
Infrastructure & Construction
Simplified loan programs to fund real estate investors nationwide with income-producing properties
Dsider
Energy & Power
SaaS platform to accelerate the expansion of energy-transition projects
Timbergrove
Energy & Power
Building AI + IoT solutions that connect and optimize assets, boosting visibility, safety, and efficiency
AtmoSpark Technologies
Food, Water, & Land
Atmospheric-water-generation systems that provide freshwater to those with limited access or in remote locations
Resolute Methane
Food, Water, & Land
Treating low-concentration methane emissions at the source by thermally oxidizing methane with a novel reactor design
Overstory
Food, Water, & Land
Minimizing vegetation contact with power lines using satellite imagery, climate data, and machine learning
Lydian
Manufacturing & Processing
Fully electrified reactors for high-efficiency conversion of non-fossil feedstocks into pure syngas
Provocative
Manufacturing & Processing
Replacing data centers’ cooling systems with carbon capture
WhaleSpotter
Transportation & Logistics
Thermal imaging and AI to prevent marine mammal strikes at sea
Solar Mantle
Infrastructure & Construction
Film that reflects sunlight for energy-free passive cooling of structures
247Solar
Energy & Power
High-temp solar power with heat storage for clean industrial heat and renewable power
Biosimo
Manufacturing & Processing
Biosimo makes eco-friendly chemicals from plant waste using a clean, low-cost process
Turnover Labs
Manufacturing & Processing
Modular electrolyzers converting dirty onsite CO₂ into basic chemicals
EQORE
EQORE is an end-to-end provider of intelligent and autonomous energy storage for commercial and industrial facilities, aimed at minimizing their electricity costs. By offering unprecedented ROIs, EQORE makes adding distributed storage to the grid financially attractive, promoting grid resilience while supporting businesses.
Sublime Systems
Infrastructure & Construction
Decarbonizing cement-making with an electrochemical process that replaces fossil-fuel-fired kilns
Universal Matter Inc.
Manufacturing & Processing
Producing graphene from carbon waste streams
ZERO Homes
Infrastructure & Construction
Automated assessment, design, and procurement platform for residential building retrofits
Nth Cycle
Manufacturing & Processing
Using electro-extraction to recover production-grade critical minerals from e-waste, low-grade ore, and mine tailings
Our Startups Have Raised Over $0B
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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.