AltEnergy

AltEnergy LLC is a private equity firm established in 2006 and located in Rowayton, Connecticut. The firm focuses on investing in the alternative energy sector, targeting high-growth companies with investments typically ranging from $5 million to $15 million. AltEnergy aims to actively participate in the development and expansion of the alternative energy industry, supporting innovative solutions that contribute to a sustainable future.

Jon Darnell

Managing Director

Russell M. Stidolph

Managing Director

3 past transactions

Eos

Post in 2023
Eos Energy Enterprises, Inc. designs, manufactures, and deploys battery storage solutions for utility, commercial and industrial, and renewable energy markets in the United States. The company offers stationary battery storage solutions. Its flagship product is the Eos Znyth DC battery system designed to meet the requirements of the grid-scale energy storage market. The company was founded in 2008 and is headquartered in Edison, New Jersey.

Viridity Energy

Venture Round in 2016
Viridity Energy enabling software turns energy profiles into financial returns. Their mission is to transform how energy customers interact proactively and productively with the electric grid. Through their ability to obtain revenue for customers from more energy markets, drive greater savings opportunities than anyone in the business, and forecast market power prices and optimize that value by factoring in the complexity of their clients' portfolios of assets, Viridity's customers can seamlessly turn their energy profiles into optimal bottom line impact.

Eos

Series C in 2015
Eos Energy Enterprises, Inc. designs, manufactures, and deploys battery storage solutions for utility, commercial and industrial, and renewable energy markets in the United States. The company offers stationary battery storage solutions. Its flagship product is the Eos Znyth DC battery system designed to meet the requirements of the grid-scale energy storage market. The company was founded in 2008 and is headquartered in Edison, New Jersey.