Applications & Installations

ESS Tech to add 8.5 GWh of US-made sodium‑ion batteries to its portfolio

ESS Tech is complementing its iron flow storage offering, which is engeeneered for the 8–24 hour long-duration segment, with sodium-ion battery products aimed at short and medium-duration applications.
Marija Maisch
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Marija Maisch
Image: Aslym Energy

From ESS News

US-based ESS Tech is targeting entry into the short- and medium-duration storage segments with non-lithium-ion storage solutions. Under a letter of intent for a strategic partnership with Alsym Energy, the long-duration storage specialist plans to add 8.5 GWh of sodium-ion cells and modules to its portfolio.

Through this initiative, ESS Tech aims to expand its presence in a market segment historically dominated by lithium-ion technologies and to develop a broader non-lithium storage offering across multiple duration ranges, with an emphasis on alternative chemistries designed to balance performance, safety, and cost.

Massachusetts-based Alsym Energy officially introduced its Na-Series in October 2025, describing it as non-flammable and non-toxic. The products use materials not sourced from foreign entities of concern (FEOC) and are positioned to support a lower levelized cost of storage (LCOS).

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