ESS
Updated: November 29, 2025
Founders: Craig Evans, Julia Song
Country: USA | Funding: $431.2M (+)
Founded: 2011
Website: https://www.essinc.com/
ESS creates long-duration energy storage (LDES) systems ideal for AI data centers, commercial and industrial facilities, utilities, microgrids and off-grid applications. They utilize an innovative iron-flow flow battery system, that uses natural elements such as iron, salt and water as electrolytes. Iron Flow technology provides unlimited cycles with zero capacity degradation over a 25-year design life. This means the batteries can be charged and discharged several times a day. ESS's gigawatt energy storage system can be deployed in months, not years. With energy storage for up to 22 hours, ESS solutions enable intermittent energy to provide baseload power. Honeywell is a major investor.
Founded: 2011
Website: https://www.essinc.com/
ESS creates long-duration energy storage (LDES) systems ideal for AI data centers, commercial and industrial facilities, utilities, microgrids and off-grid applications. They utilize an innovative iron-flow flow battery system, that uses natural elements such as iron, salt and water as electrolytes. Iron Flow technology provides unlimited cycles with zero capacity degradation over a 25-year design life. This means the batteries can be charged and discharged several times a day. ESS's gigawatt energy storage system can be deployed in months, not years. With energy storage for up to 22 hours, ESS solutions enable intermittent energy to provide baseload power. Honeywell is a major investor.
