MCJ

Founded in 2019, MCJ is a venture capital firm based in Boston, Massachusetts. The company focuses on investing in technology startups that drive industrial transformation and infrastructure resilience, aiming to make industries cleaner, more profitable, and more resilient.

Cody Simms

Managing Partner

Past deals in CleanTech

Exowatt

Series A in 2025
Exowatt is a next-generation renewable energy company that specializes in providing sustainable energy solutions for commercial and industrial applications. The company develops a modular full-stack energy system that consists of a heat collector, a heat battery, and a heat engine. This innovative system is designed to deliver dispatchable power and heat, ensuring that energy is consistently available to meet the demands of energy-intensive operations, such as data centers. By focusing on modularity and efficiency, Exowatt aims to enhance the accessibility and reliability of renewable energy, facilitating a transition towards more sustainable energy practices in various industries.

Fourier

Series A in 2025
Fourier specializes in developing modular, automated hydrogen production systems designed for on-site deployment. This eliminates the need for hydrogen transportation, making it universally accessible. Their innovative architecture contributes to a sustainable energy future by providing green hydrogen for industries such as transportation and power storage.

Moment Energy

Series A in 2025
Moment Energy specializes in battery energy storage systems that utilize repurposed electric vehicle batteries. Its solutions aim to provide clean, reliable, and cost-effective energy storage for both on-grid and off-grid applications.

Heirloom

Series B in 2024
Heirloom is a carbon capture company developing direct air capture technology that accelerates the natural absorption of carbon dioxide. Its approach uses a limestone-based process to increase CO2 uptake and stores the captured carbon permanently underground, powered by renewable energy. The company also applies carbon capture and utilization techniques to enhance natural CO2 removal. By offering a scalable, renewable-energy driven solution, Heirloom aims to help businesses meet sustainability goals with a cost-effective path to significant carbon removal.

Mantel

Series A in 2024
Mantel develops innovative carbon capture technology designed for use within boilers, kilns, and furnaces. Their method reduces energy losses and enables net-negative emissions, targeting gigaton-level carbon removal. This helps mitigate sustainability concerns across industries such as industrial heat, steel, and chemicals.

Paces

Series A in 2024
Paces is developing a data platform aimed at enhancing the development and operation of green infrastructure projects. By providing actionable data signals across 3,500 U.S. counties, the platform encompasses a variety of critical information, including environmental, permitting, zoning, interconnection data, and competition risks. Additionally, Paces offers modeled signals that assess climate risks, profitability forecasts, and parcel rankings. This granular data is tailored to specific land parcels and green infrastructure assets, enabling developers, operators, and investors to make informed decisions about profitable construction and investment in sustainable projects.

Verse

Series A in 2024
Verse provides software for organizations to understand, plan, and manage clean energy. Its SaaS platform, Aria™, leverages generative AI to help companies define clean energy goals and plan, procure, and manage optimal portfolios of clean energy assets at least cost. Customers can set parameters that target specific goals (e.g., cost, emissions, or hourly matching) and optimize for annual matching, emissions matching, or hourly matched carbon-free energy (CFE). By reducing transaction costs by up to 70% and providing real-time analysis within minutes, Aria helps scale and accelerate the clean energy transition.

Quilt

Series A in 2024
Quilt is a company focused on smart home climate solutions, specializing in advanced home temperature control technology designed to enhance energy efficiency. Its AI-driven systems seamlessly integrate into various home environments, providing users with room-by-room control and occupancy awareness features. This technology not only optimizes energy use but also incorporates predictive capabilities to ensure comfort. Additionally, Quilt's ductless heat pump system operates with zero carbon emissions, utilizing clean energy sources to promote sustainability and help users transition away from traditional combustion methods. Overall, Quilt aims to deliver a sleek and intelligent solution for modern heating and cooling needs, contributing to a more sustainable future.

Arch

Seed Round in 2024
Arch is focused on creating a climate tech platform aimed at enhancing the sustainability of homes through electrification. The company develops an innovative System of Intelligence that integrates sales, design, and financing aspects of home electrification projects. Utilizing artificial intelligence, Arch's platform conducts real-time home analyses and generates rapid system designs. This technology enables the automatic creation of customized, visual proposals, which enhances the sales conversion process from lead generation to installation. By streamlining these processes, Arch aims to provide a green foundation for future generations, promoting more sustainable living solutions.

Zeno

Venture Round in 2023
Zeno is a climate conscious motor company that offers eco-friendly motorcycles.

Opna

Seed Round in 2023
Opna is a financing platform dedicated to supporting climate projects that aim to reduce carbon emissions and protect natural ecosystems. The company specializes in providing data and proprietary risk assessments, along with creating efficient capital structures. This enables businesses to convert net-zero committed capital from financial institutions and corporations into direct financing throughout the lifecycle of climate initiatives. By facilitating these financial transactions, Opna plays a crucial role in advancing high-quality global climate projects.

Quilt

Seed Round in 2023
Quilt is a company focused on smart home climate solutions, specializing in advanced home temperature control technology designed to enhance energy efficiency. Its AI-driven systems seamlessly integrate into various home environments, providing users with room-by-room control and occupancy awareness features. This technology not only optimizes energy use but also incorporates predictive capabilities to ensure comfort. Additionally, Quilt's ductless heat pump system operates with zero carbon emissions, utilizing clean energy sources to promote sustainability and help users transition away from traditional combustion methods. Overall, Quilt aims to deliver a sleek and intelligent solution for modern heating and cooling needs, contributing to a more sustainable future.

Avalanche Energy

Series A in 2023
Avalanche Energy develops compact fusion reactors for distributed energy applications. Its modular reactor design enables clean energy production with high energy density, facilitating decarbonization efforts.

Noya

Series A in 2023
Noya develops carbon capture technology that enables industrial facilities to remove CO2 from the atmosphere by retrofitting existing equipment. The company adds a non-toxic CO2 absorbing chemical blend to current cooling towers, allowing simultaneous cooling and carbon capture without major mechanical changes to the towers. The captured CO2 is then sold to companies that use it as a raw material, supporting other industries' climate initiatives. Noya's approach is aimed at accelerating the world’s transition toward a carbon-negative economy by providing a modular, retrofit-based solution that tackles emissions from industrial cooling processes.

Lun

Seed Round in 2023
Lun decarbonises homes faster by building the operating system for heat pump installers.

BlocPower

Series B in 2023
BlocPower designs and implements energy efficiency and electrification upgrades for urban buildings, including schools, churches, small businesses, non-profits, and homes. Through proprietary software, machine learning, and IoT-enabled monitoring, it analyzes facilities to identify cost-effective retrofits, combines financing and project management, and delivers scalable deployment that reduces energy waste and utility bills while enhancing indoor air quality and comfort.

Kodama Systems

Seed Round in 2022
Kodama Systems is a technology company focused on forest management, aiming to enhance forest resilience and carbon sequestration. Its innovative solutions streamline in-field operations through a comprehensive approach that improves productivity in forest thinning. The company's technology leverages simulation, teleoperation, and equipment integration to provide valuable feedback and insights. By addressing the challenges posed by wildfires and carbon emissions, Kodama Systems supports the construction and mining industries in their efforts to mitigate climate impacts while promoting sustainable forestry practices.

Verse

Seed Round in 2022
Verse provides software for organizations to understand, plan, and manage clean energy. Its SaaS platform, Aria™, leverages generative AI to help companies define clean energy goals and plan, procure, and manage optimal portfolios of clean energy assets at least cost. Customers can set parameters that target specific goals (e.g., cost, emissions, or hourly matching) and optimize for annual matching, emissions matching, or hourly matched carbon-free energy (CFE). By reducing transaction costs by up to 70% and providing real-time analysis within minutes, Aria helps scale and accelerate the clean energy transition.

Climate Club

Seed Round in 2022
Clarasight operates a sustainability analytics platform designed to help organizations analyze, forecast, and implement effective carbon emissions reduction strategies. The platform integrates with various existing software systems and utilizes artificial intelligence to generate actionable insights and recommendations for sustainability initiatives. By providing dynamic carbon planning and real-time analysis, Clarasight enables companies to set and track sustainability goals at both team and individual levels. This approach empowers organizations to embed sustainability into their operations and support their journey toward achieving Net Zero emissions.

Kopperfield

Seed Round in 2022
Kopperfield operates a platform that simplifies home electrification for contractors and consumers. It connects consumers with qualified contractors and uses software for digital site audits, online proposals, multi-channel communication, and payments infrastructure.

Patch

Series B in 2022
Founded in 2020, Patch specializes in developing infrastructure for a climate-positive economy. It offers an API that simplifies carbon removal, enabling businesses to calculate and mitigate their carbon footprint with minimal coding effort.

Lightship

Series A in 2022
Lightship is an early-stage hardware startup founded in 2020 by former Tesla employees, based in San Francisco. The company is focused on revolutionizing the recreational vehicle (RV) industry, which is valued at $26 billion, by developing an aerodynamic, battery-powered trailer. This innovative vehicle aims to provide an environmentally friendly alternative to traditional gas-powered RVs, alleviating issues such as noise, emissions, and range anxiety. By prioritizing sustainability, Lightship seeks to enhance outdoor travel experiences while promoting the preservation of nature. The company’s approach allows travelers to reduce fuel costs and minimize their environmental impact, making it easier to explore the outdoors responsibly.

Fleetzero

Venture Round in 2022
Founded in Auburn, Alabama in 2021, Fleetzero develops a fleet of electric cargo ships to decarbonize ocean freight. Its vessels offer lower operational costs and higher reliability than traditional fossil-fuel ships.

Toucan

Seed Round in 2022
Toucan is a company focused on creating technology that facilitates large-scale climate action by enhancing the voluntary carbon market. It develops digital infrastructure aimed at improving transparency and integrity within this market, which is essential for directing funds to effective climate impact projects. By pioneering the use of tokenized carbon credits, Toucan aims to incorporate both established and emerging environmental assets onto the blockchain. The company's overarching goal is to establish a regenerative financial system that addresses climate change while promoting sustainable revenue flows to impactful initiatives.

Arcadia

Series E in 2022
Arcadia, Inc. is a technology company based in Washington, D.C., founded in 2014, that focuses on providing access to clean energy solutions. Through its platform, Arc, the company connects subscribers to renewable energy sources such as wind farms and community solar projects. By enabling users to manage their accounts, track energy usage, and participate in clean energy initiatives, Arcadia aims to democratize access to renewable energy and combat the fossil fuel monopoly. The platform aggregates energy data from over 125 utilities, representing more than 80% of U.S. electric utility accounts, thus facilitating a significant shift toward sustainable energy practices. Additionally, Arcadia's community solar program addresses energy injustice while promoting economic growth, contributing over five Terawatt-hours of energy demand from residential and commercial users.

Artyc

Seed Round in 2022
Artyc specializes in providing sustainable cold shipping solutions tailored for the biotech, pharmaceutical, and medical sectors. The company manufactures refrigerant-free, reusable, active cooling containers that enhance the efficiency of cold logistics. By focusing on decarbonizing the cold chain, Artyc aims to create a more sustainable logistics industry. Their innovative containers not only help businesses reduce shipping costs but also enable effective temperature monitoring, ensuring the safe transport of sensitive goods.

Carbon Collective

Seed Round in 2022
Carbon Collective is an innovative online investment advisor dedicated exclusively to climate-focused investing. The company aims to address the significant annual climate investment gap of $5 trillion by providing a platform that offers sustainable and green investment services. Through its user-friendly interface, Carbon Collective provides low-fee, diversified investment portfolios designed to reduce carbon dioxide emissions. This approach empowers investors to support and reinvest in companies that are actively working to combat climate change, aligning financial growth with environmental responsibility.

Sense

Series C in 2022
Sense Labs, Inc. is a technology company based in Cambridge, Massachusetts, specializing in home energy monitoring solutions. Established in 2013, the company develops and manufactures electronic devices that analyze electricity usage in households. Its flagship product, Sense, utilizes current sensors installed on main breakers to capture the electronic signatures of various appliances. This system employs advanced algorithms to identify and differentiate individual devices, providing users with insights into their energy consumption. Sense also offers a range of related products, including Sense Solar, add-on sensors, and various replacement components. The data collected by these devices is transmitted to users via a dedicated mobile application, enhancing the home automation experience.

Living Carbon

Series A in 2022
Living Carbon is a public benefit corporation based in San Francisco, California, founded in 2019 by Maddie Hall and Patrick Mellor. The company leverages advanced biotechnology to enhance the natural ability of plants, particularly trees, to capture and store carbon dioxide (CO2). By improving photosynthesis, inhibiting photorespiration, increasing growth rates, and shortening tree growing cycles, Living Carbon aims to create more durable wood for building and manufacturing applications while addressing climate change. The company's ultimate goal is to restore balance to the planet's metabolic processes through innovative forest biotechnology solutions.

Climate Club

Pre Seed Round in 2022
Clarasight operates a sustainability analytics platform designed to help organizations analyze, forecast, and implement effective carbon emissions reduction strategies. The platform integrates with various existing software systems and utilizes artificial intelligence to generate actionable insights and recommendations for sustainability initiatives. By providing dynamic carbon planning and real-time analysis, Clarasight enables companies to set and track sustainability goals at both team and individual levels. This approach empowers organizations to embed sustainability into their operations and support their journey toward achieving Net Zero emissions.

Clean Crop Technologies

Series A in 2021
Clean Crop Technologies develops an innovative cold plasma treatment that uses air and electricity to remove contaminants such as pathogens, toxins, molds, and yeasts from seeds and foods. This energy-efficient process improves crop yields, reduces food waste, enhances food safety, and leaves no harmful residues.

Helio Home

Seed Round in 2021
Helio is a company focused on facilitating the transition from fossil fuels to complete electrification of homes. It operates an innovative online platform that provides customers with a straightforward and cost-effective approach to achieve whole-home electrification. The platform integrates various systems including solar energy, heating and cooling, electrical systems, insulation, and ventilation, ensuring a holistic design for energy efficiency. By promoting the use of electric solutions, Helio aims to help customers reduce their carbon footprints and minimize reliance on fossil fuels, contributing to a more sustainable future.

Moment Energy

Seed Round in 2021
Moment Energy specializes in battery energy storage systems that utilize repurposed electric vehicle batteries. Its solutions aim to provide clean, reliable, and cost-effective energy storage for both on-grid and off-grid applications.

Lilac Solutions

Series B in 2021
Lilac Solutions, Inc. is a mining technology company based in Oakland, California, specializing in lithium extraction technology. Founded in 2015, the company develops innovative solutions that utilize ion-exchange theory to absorb lithium from brine deposits. This technology includes ion exchange beads and continuous brine processing systems, which enable lithium producers to enhance project development, increase lithium recovery, and optimize operations. Lilac Solutions aims to support industries such as electric vehicles and renewable energy storage by providing methods that reduce both costs and environmental impact associated with lithium production.

Dispatch Goods

Seed Round in 2021
Dispatch Goods designs and provides reusable packaging for the food service and delivery ecosystem. It manufactures reusable steel containers and operates a reverse logistics platform that collects, sanitizes, and returns containers, enabling restaurants, food trucks, and meal-delivery services to replace disposable packaging. Founded in 2018 and headquartered in San Francisco, the company aims to deliver immediate cost savings for enterprise customers while reducing waste and carbon footprint by eliminating single-use packaging.

Arcadia

Series D in 2021
Arcadia, Inc. is a technology company based in Washington, D.C., founded in 2014, that focuses on providing access to clean energy solutions. Through its platform, Arc, the company connects subscribers to renewable energy sources such as wind farms and community solar projects. By enabling users to manage their accounts, track energy usage, and participate in clean energy initiatives, Arcadia aims to democratize access to renewable energy and combat the fossil fuel monopoly. The platform aggregates energy data from over 125 utilities, representing more than 80% of U.S. electric utility accounts, thus facilitating a significant shift toward sustainable energy practices. Additionally, Arcadia's community solar program addresses energy injustice while promoting economic growth, contributing over five Terawatt-hours of energy demand from residential and commercial users.

SINAI

Seed Round in 2021
SINAI Technologies, established in 2017 and headquartered in San Francisco, specializes in enterprise decarbonization software. Its platform monitors, analyzes, and provides actionable recommendations to reduce carbon emissions across various departments and processes within a company. Key modules include carbon footprint tracking, low carbon scenario analysis, carbon pricing design, and target setting. The software enables organizations to automate carbon analysis and reporting, fostering a more sustainable and efficient business environment.

Lightship

Seed Round in 2021
Lightship is an early-stage hardware startup founded in 2020 by former Tesla employees, based in San Francisco. The company is focused on revolutionizing the recreational vehicle (RV) industry, which is valued at $26 billion, by developing an aerodynamic, battery-powered trailer. This innovative vehicle aims to provide an environmentally friendly alternative to traditional gas-powered RVs, alleviating issues such as noise, emissions, and range anxiety. By prioritizing sustainability, Lightship seeks to enhance outdoor travel experiences while promoting the preservation of nature. The company’s approach allows travelers to reduce fuel costs and minimize their environmental impact, making it easier to explore the outdoors responsibly.

Remora

Seed Round in 2021
Remora develops carbon capture technology tailored for trains and trucks. Their device extracts at least 80% of a semi-truck's carbon emissions directly from the tailpipe, purifies it, and sells the CO2 to end-users for long-term storage. This generates revenue for fleet operators, enabling reduced emissions and addressing national CO2 shortages.
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