In April, ESS signed an LOI for a strategic partnership with US Na-ion battery startup Alsym Energy, seeing ESS add 8.5GWh of Alsym’s cells and modules to its portfolio.
Alsym uses a proprietary version of sodium iron phosphate pyrophosphate (NFPP) cathode material that it has dubbed NFPP+, with an added “best-in-class energy density and no possibility of entering thermal runaway.”
Contingent on successful execution and future development, Juniper Energy intends to procure at least 500MWh of ESS BESS by 2032.
ESS Inc was founded in 2011 and has been primarily known as the technology developer and holder of IP for a proprietary flow battery based on an iron and saltwater electrolyte, designed for long-duration energy storage (LDES) applications. The company got its listing on the New York Stock Exchange (NYSE) in 2021 and has struggled to reach profitability. This has led to recent strategic changes, such as pivoting first toward a larger form factor iron flow battery solution.
Although it appears to remain active in that space, ESS Inc has added sodium-ion BESS integration to its offerings. The company is due to release its Q2 2026 financial results on 13 August.
