MCJ

MCJ is a venture capital firm that invests in startups driving the transition of energy and industry towards cleaner, more profitable, and resilient solutions. They back extraordinary founders tackling climate change impacts and connect them with a network of tech and industrial leaders through the MCJ Collective. Additionally, MCJ operates a media platform, including the Inevitable podcast, to spotlight key perspectives in the transition to a low-carbon economy.

David Aronoff

Chairman and Managing Partner

Past deals in Energy

Exowatt

Series A in 2025
Exowatt is a renewable energy company that specializes in modular, full-stack energy solutions for commercial and industrial clients. Their innovative system comprises a heat collector, a heat battery, and a heat engine, which together generate dispatchable power and heat on demand. This enables businesses, particularly those with energy-intensive operations like data centers, to meet their energy needs sustainably and reliably throughout the day.

Fourier

Series A in 2025
Fourier is focused on making on-site hydrogen production universally accessible, with the goal of transitioning the global energy landscape towards a sustainable and emission-free future. The company designs and manufactures advanced, modular electrolyzers that enable the efficient production of green hydrogen. These fully automated systems cater to various industries, including transportation, heating and cooling, and power storage. By providing innovative renewable energy solutions, Fourier aims to play a significant role in fostering a sustainable energy future.

Moment Energy

Series A in 2025
Moment Energy focuses on developing sustainable battery energy storage systems that repurpose retired electric vehicle batteries. The company aims to enhance energy reliability for off-grid areas and address peak demand in on-grid locations. By utilizing these repurposed batteries, Moment Energy provides clean, reliable, and cost-effective energy storage solutions, making renewable energy more accessible for both off-grid and industrial customers.

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 focuses on harnessing wind energy through innovative airframe technology that operates on a lightweight track. By employing a unique geometry, the company generates energy comparable to traditional wind turbines but at a significantly reduced cost. Its system consists of multiple small airframes that move along a slender oval track, utilizing downwind forces supported by a bridling system. This flexible configuration allows for adaptation to various landscapes and energy needs, enabling clients to efficiently and economically capture wind energy. Airloom Energy is committed to providing low-cost utility-scale wind energy solutions.

Avalanche Energy

Series A in 2023
Avalanche Energy is a fusion energy startup focused on developing compact micro-fusion reactors for various applications, including distributed energy, mobility, and space propulsion. The company utilizes a unique modular reactor architecture that can be stacked to provide scalable and limitless power solutions. By harnessing a self-sustaining fusion chain reaction, Avalanche Energy aims to deliver carbon-free energy while ensuring safety and eliminating long-lived radioactive waste. The company emphasizes rapid design, build, test, and fix cycles to facilitate quick development and scalability, addressing the increasing global demand for clean energy solutions.

BlocPower

Series B in 2023
BlocPower is an energy technology startup based in Los Angeles, California, focused on creating healthier, greener, and smarter buildings. Founded in 2014 in Brooklyn, New York, by Donnel Baird and Morris Cox, the company specializes in retrofitting urban buildings with advanced energy efficiency technologies and green heating and cooling systems. BlocPower identifies energy-wasting buildings and utilizes a proprietary machine learning platform to determine the most effective retrofits for maximizing energy savings. The company connects various stakeholders, including government agencies, utilities, building owners, and equipment providers, to facilitate these upgrades. With a mission to serve financially underserved communities, BlocPower has completed projects in nearly 1,000 buildings, helping customers save 20–40% on their annual energy bills. By leveraging data and innovative financing, BlocPower aims to reduce carbon emissions and improve health outcomes while addressing the climate crisis.

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 company focused on advancing the transition to a sustainable energy system by connecting and optimizing energy devices. Through its digital platform, Enode's APIs allow businesses to seamlessly integrate users' energy hardware, such as electric vehicles, solar inverters, home batteries, and thermostats, into their applications. This streamlined approach significantly reduces the time and resources needed for integration and ongoing maintenance, making it easier for companies to develop energy management applications. By optimizing energy consumption and enabling participation in flexible energy markets, Enode supports clients in their efforts to contribute to 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.

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.

David Energy

Series A in 2022
David Energy is an innovative energy company focused on transforming electricity consumption and management through advanced technology. It develops an energy management platform that assists customers in optimizing their energy usage by selecting the most suitable mix of behind-the-meter (BTM) assets tailored to specific building and consumption profiles. By leveraging sophisticated machine learning, David Energy enables businesses to design, install, and finance various BTM solutions, effectively lowering energy bills and enhancing control over energy usage. With a commitment to integrating renewable energy sources and promoting smart energy management, David Energy contributes to a more sustainable and efficient energy landscape.

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.

Moment Energy

Seed Round in 2021
Moment Energy focuses on developing sustainable battery energy storage systems that repurpose retired electric vehicle batteries. The company aims to enhance energy reliability for off-grid areas and address peak demand in on-grid locations. By utilizing these repurposed batteries, Moment Energy provides clean, reliable, and cost-effective energy storage solutions, making renewable energy more accessible for both off-grid and industrial customers.

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 company that aims to make cleaner and more affordable electricity accessible to households across the United States. Based in New York City, Washington, D.C., and Seattle, WattBuy has assembled a team of product leaders and engineers with backgrounds from major tech firms. The company has developed an electricity management platform that empowers users to take control of their electricity usage. By utilizing a personalized recommendation engine, the platform helps residents identify and set up electricity plans tailored to their preferences and consumption patterns. This approach not only enables clients to save money but also facilitates switching to more cost-effective electricity suppliers in their area, thereby promoting both financial savings and environmental sustainability.

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, Inc. is a Seattle-based company founded in 2016 that operates a renewable energy transaction marketplace. This platform serves to connect corporate and industrial power buyers with power purchase agreements (PPAs) from utility-scale wind, solar, and storage projects. By facilitating access to a wide range of renewable energy options, LevelTen Energy enables clients to secure fixed-price renewable energy solutions and benefit economically from large-scale projects. The company's technology-driven marketplace enhances the efficiency of transactions, allowing buyers, advisors, and sellers to achieve better deals in a streamlined manner. Through its services, LevelTen Energy plays a significant role in advancing the adoption of renewable energy in the corporate sector.

Enode

Seed Round in 2021
Enode is a company focused on advancing the transition to a sustainable energy system by connecting and optimizing energy devices. Through its digital platform, Enode's APIs allow businesses to seamlessly integrate users' energy hardware, such as electric vehicles, solar inverters, home batteries, and thermostats, into their applications. This streamlined approach significantly reduces the time and resources needed for integration and ongoing maintenance, making it easier for companies to develop energy management applications. By optimizing energy consumption and enabling participation in flexible energy markets, Enode supports clients in their efforts to contribute to a zero-carbon energy grid.

David Energy

Seed Round in 2021
David Energy is an innovative energy company focused on transforming electricity consumption and management through advanced technology. It develops an energy management platform that assists customers in optimizing their energy usage by selecting the most suitable mix of behind-the-meter (BTM) assets tailored to specific building and consumption profiles. By leveraging sophisticated machine learning, David Energy enables businesses to design, install, and finance various BTM solutions, effectively lowering energy bills and enhancing control over energy usage. With a commitment to integrating renewable energy sources and promoting smart energy management, David Energy contributes to a more sustainable and efficient energy landscape.
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