ESS’s core technology is an iron-flow battery using abundant materials—iron, salt, and water—in a liquid electrolyte system that enables up to 12 hours of storage and unlimited cycle life over a 25-year lifespan. The design offers safety, sustainability, grid stabilization, and renewable integration for long-duration applications.
The flagship Energy Center product, commercially launched in 2024, delivers modular iron-flow battery systems for utilities and microgrids with long-duration storage, flexible deployment, and seismic resilience.
In 2024, ESS launched its Energy Center with deployments for a major Florida utility and a Portland General Electric demo. It secured a $50 million U.S. Export-Import Bank financing to expand its Oregon manufacturing facility and partnered with Energy Storage Industries Asia Pacific to target 400 MW annual production in Australia. The Energy Center earned the Smarter E Innovation Award and IEEE 693-High seismic rating.
Key investors include Breakthrough Energy Ventures, SoftBank Energy, and BASF Venture Capital, with strategic partnerships with Honeywell to support technology deployment.
