WILSONVILLE, Ore. & MALDEN, Mass.–(BUSINESS WIRE)–ESS Tech, Inc. (NYSE: GWH) (“ESS” or the “Company”), a leading manufacturer of sustainable, long‑duration energy storage systems (“LDES”), today announced the signing of a letter of intent for a strategic partnership with Alsym Energy, a pioneer in non-flammable, high-performance sodium-ion batteries, to add 8.5 GWh of sodium‑ion cells and modules to its portfolio. This next‑generation battery solution is designed to address use cases traditio