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.

Past deals in Renewables

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.

AirLoom Energy

Seed Round in 2023
AirLoom Energy develops wind energy technology that uses lightweight wings operating on a track to capture wind. The design aims to deliver the same amount of energy as conventional turbines at a fraction of the cost, enabling low-cost utility-scale wind energy. The system uses multiple small airframes on a slender oval track with downwind forces supported by a bridling system, and the configuration can be adjusted depending on the landscape, allowing clients to harvest wind energy in cost-effective and quicker ways.

Odyssey

Series A in 2023
Odyssey Energy Solutions, founded in 2017 and based in Boulder, Colorado, offers a web-based data platform designed to streamline the development and deployment of mini-grids in emerging markets. The platform enables project developers to effectively manage and analyze mini-grid data through various software tools and data analytics. By facilitating communication and connection among developers, financiers, vendors, and governmental and donor organizations, Odyssey enhances collaboration within the mini-grid sector, ultimately supporting sustainable energy solutions in underserved regions.

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.

BasiGo

Seed Round in 2022
BasiGo is an e-mobility company focused on electrifying public transportation in Kenya and Rwanda. It provides electric buses to bus operators through a flexible financing and service model that includes maintenance and battery charging, helping operators transition from diesel with predictable operating costs. Its buses are designed to be an economical, convenient, and reliable alternative to diesel, capable of all-day operation on a single charge with proven battery technology. By offering affordable financing options and end-to-end support, BasiGo enables bus owners to adopt electric fleets while reducing fuel costs and emissions.

WeaveGrid

Series B in 2022
WeaveGrid is a technology company focused on facilitating the integration of electric vehicles (EV) with the power grid. By employing machine learning, optimization, and predictive analytics, WeaveGrid's software addresses the challenges associated with EV-grid integration for utility companies. This innovative solution not only enhances the incorporation of renewable energy resources but also aims to reduce costs for utility customers. The company's efforts support the broader goals of decarbonization in the transportation and power sectors, enabling utilities to safely and economically adapt to the growing demand for electric vehicles.

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.

Enode

Series A in 2022
Enode is a technology company focused on facilitating the transition to a sustainable energy system by connecting and optimizing various energy devices. Its platform utilizes application programming interfaces (APIs) to enable seamless integration of energy products, such as electric vehicles, home batteries, solar inverters, and thermostats, into applications. This approach allows businesses to quickly connect users’ energy devices with minimal coding, significantly reducing the time and complexity associated with developing energy management applications. By streamlining the integration process, Enode helps clients optimize energy consumption and participate in flexible markets, contributing to the development of a zero-carbon energy grid.

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.

Odyssey

Venture Round in 2022
Odyssey Energy Solutions, founded in 2017 and based in Boulder, Colorado, offers a web-based data platform designed to streamline the development and deployment of mini-grids in emerging markets. The platform enables project developers to effectively manage and analyze mini-grid data through various software tools and data analytics. By facilitating communication and connection among developers, financiers, vendors, and governmental and donor organizations, Odyssey enhances collaboration within the mini-grid sector, ultimately supporting sustainable energy solutions in underserved regions.

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.

Terra.do

Seed Round in 2022
Terra.do Inc. is an online climate education platform founded in 2020, with headquarters in Bengaluru, India, and an additional office in Stanford, California. The company aims to facilitate the transition to climate careers by providing learners with a comprehensive overview of the climate landscape. It collaborates with experts in climate science and related fields to deliver programs covering various topics, including climate science, environmental finance, and change mitigation. Through its online offerings, Terra.do enables participants to engage in hands-on climate projects, allowing them to apply their skills and knowledge in meaningful ways as they pursue careers focused on addressing climate challenges.

Nitricity

Venture Round in 2022
Nitricity is an energy company focused on renewable nitrogen fertilizer production with zero carbon emissions. It develops electrified, climate-smart fertilizer products and manufactures nitric acid and ammonia, which can be used separately or combined to produce ammonium nitrate fertilizer. The approach aims to bring products closer to farmers, enable timely application, reduce runoff, and maximize nitrogen delivery on a global scale.

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.

Crusoe Energy Systems

Series C in 2022
Crusoe Energy Systems Inc., based in Denver, Colorado, develops innovative technology and solutions aimed at addressing operational, environmental, and regulatory challenges in the oil and gas sector. Founded in 2018, the company specializes in its Digital Flare Mitigation solution, which allows upstream operators without pipeline access to convert wasted natural gas into electricity for energy-intensive computing. This service not only helps oil and gas producers reduce routine flaring of natural gas but also assists them in achieving regulatory compliance and maintaining production levels amid increasing regulations and pipeline constraints. Crusoe Energy Systems is committed to creating solutions that benefit the environment, local communities, and energy producers alike.

David Energy

Series A in 2022
David Energy is an innovative energy company that optimizes electricity consumption and management via advanced software and hardware solutions. It aims to reduce costs, increase renewable energy adoption, and enhance sustainability through smart energy management.

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.

Epoch Biodesign

Seed Round in 2022
Epoch Biodesign develops natural solutions to scale and industrialize biology to address climate challenges. The company designs and develops enzymes by combining biology, artificial intelligence, and engineering to break down plastics into reusable chemicals, enabling biorecycling as a tunable enzymatic process that converts plastic waste into everyday chemicals. It provides industrial biotechnology services aimed at reducing plastic waste and advancing sustainability.

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.

Evergrow

Seed Round in 2021
Evergrow provides offtake contracts and financing for projects that avoid, capture, or remove carbon emissions. It was founded in 2021 and is based in San Francisco, California.

Overstory

Seed Round in 2021
Overstory is a vegetation management software company that serves electric utilities. The platform integrates artificial intelligence with remote sensing from satellite and aerial imagery to monitor vegetation near power corridors, assess wildfire risks, and optimize resource use. By prioritizing vegetation risks before they materialize, Overstory helps utilities prevent outages, reduce wildfire risk, and improve reliability and safety across service areas, contributing to a safer, more resilient grid.

Leap

Series B in 2021
Leap is a marketplace for Distributed Energy Resources to participate in the energy market. It allows every connected device to help balance the grid, and get paid for it and access wholesale markets through a single API and help build the flexible, renewable grid of the future. Leap aims to make global energy markets accessible to anyone, starting with demand response and expanding into generation and ancillary services. Leap was founded by Thomas Folker and Remco Van Den Elzen.

WattBuy

Series A in 2021
WattBuy is a technology company focused on providing households with access to cleaner and more affordable electricity. Headquartered in New York City, Washington D.C., and Seattle, the company comprises a team of product leaders and engineers with backgrounds from major tech firms. WattBuy has developed an electricity management platform that allows users to take control of their electricity consumption. Through a personalized recommendation engine, the platform helps residents select electricity plans tailored to their preferences and usage patterns, enabling them to save money and switch to the most cost-effective suppliers in their regions. The company's mission centers on leveraging technology to address energy inequality and contribute positively to climate change.

Energetic Capital

Series A in 2021
Energetic Insurance, Inc. is an InsurTech company based in Boston, Massachusetts, founded in 2016. It specializes in providing solar insurance solutions that address credit and counterparty risks associated with commercial and industrial solar photovoltaic projects. The company offers a product called EneRate, which protects third-party solar developers and asset owners from repayment risks and revenue losses due to defaults on power purchase agreements (PPAs). Energetic Insurance employs a data-driven approach as a Managing General Underwriter, developing innovative risk management products that facilitate solar financing for unrated or below investment grade organizations. This enables solar project developers to undertake more projects and access capital by mitigating payment default risks, thereby enhancing project economics through lower interest rates and improved financial structuring.

Yard Stick

Seed Round in 2021
Yard Stick develops a handheld device that measures soil carbon levels in real-time. This enables evidence-based regenerative farming practices, improving soil health, increasing farmer income, and combating climate change by sequestering carbon.

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.

LevelTen Energy

Series C in 2021
LevelTen Energy is a Seattle-based company that operates a renewable energy transaction marketplace platform. Founded in 2016, it facilitates connections between corporate and industrial power buyers and utility-scale wind, solar, and storage projects. The platform enables these buyers to access power purchase agreements (PPAs), providing financial security through fixed-price renewables and the economic advantages of large-scale projects. LevelTen Energy equips renewable energy buyers, advisors, and sellers with tools and services to expedite better deals.

Nitricity

Seed Round in 2021
Nitricity is an energy company focused on renewable nitrogen fertilizer production with zero carbon emissions. It develops electrified, climate-smart fertilizer products and manufactures nitric acid and ammonia, which can be used separately or combined to produce ammonium nitrate fertilizer. The approach aims to bring products closer to farmers, enable timely application, reduce runoff, and maximize nitrogen delivery on a global scale.

Pachama

Series A in 2021
Pachama uses AI and satellite data to monitor and verify carbon sequestration in forests. This enables businesses to invest in nature-based solutions for carbon offsetting, while supporting local communities and wildlife conservation.

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.

Enode

Seed Round in 2021
Enode is a technology company focused on facilitating the transition to a sustainable energy system by connecting and optimizing various energy devices. Its platform utilizes application programming interfaces (APIs) to enable seamless integration of energy products, such as electric vehicles, home batteries, solar inverters, and thermostats, into applications. This approach allows businesses to quickly connect users’ energy devices with minimal coding, significantly reducing the time and complexity associated with developing energy management applications. By streamlining the integration process, Enode helps clients optimize energy consumption and participate in flexible markets, contributing to the development of a zero-carbon energy grid.

Yard Stick

Pre Seed Round in 2021
Yard Stick develops a handheld device that measures soil carbon levels in real-time. This enables evidence-based regenerative farming practices, improving soil health, increasing farmer income, and combating climate change by sequestering carbon.

David Energy

Seed Round in 2021
David Energy is an innovative energy company that optimizes electricity consumption and management via advanced software and hardware solutions. It aims to reduce costs, increase renewable energy adoption, and enhance sustainability through smart energy management.

Pachama

Seed Round in 2020
Pachama uses AI and satellite data to monitor and verify carbon sequestration in forests. This enables businesses to invest in nature-based solutions for carbon offsetting, while supporting local communities and wildlife conservation.
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