ESS Tech, Inc. (NYSE: GWH) announced a letter of intent with Alsym Energy that will add 8.5 GWh of sodium‑ion battery cells and modules to its product line. The partnership will allow ESS to offer a non‑lithium, non‑flammable battery solution for short‑ and medium‑duration applications, complementing its existing iron‑flow Energy Base platform.
The deal positions ESS to serve a broader range of customers—including utilities, hyperscalers, and industrial sites—that require fast‑response, high‑power storage without the thermal‑runaway risks of lithium chemistry. By combining Alsym’s high‑performance sodium‑ion technology with ESS’s system expertise, the company aims to deliver a unified, non‑lithium platform that can meet diverse duration needs from a few hours to several days.
ESS’s financial performance has been challenging. Over the last twelve months the company reported revenue of $1.58 million and negative gross profit margins. In Q4 2025, ESS posted an EPS of –$1.20, missing analyst expectations of –$0.76. The full‑year 2025 revenue of $1.6 million is a sharp decline from $6.3 million in 2024, although the net loss improved. The partnership is therefore seen as a potential catalyst for a turnaround by expanding the addressable market and accelerating commercialization of its Energy Base product.
Management emphasized the complementary nature of the two technologies. “Sodium‑ion and iron flow are complementary technologies. Alsym’s sodium‑ion Na‑Series is an ideal solution for ESS’s short‑ and medium‑duration applications where high power, fast cycling, and rapid response are paramount,” said Drew Buckley, CEO of ESS. Randall Selesky, Chief Commercial Officer, added, “This partnership represents a major milestone in our strategy to become a full‑spectrum, non‑lithium solutions provider for the entire energy storage market with safer, more sustainable technologies.” Mukesh Chatter, CEO of Alsym Energy, noted, “By combining high performance, inherent safety, and supply chain resilience, Alsym’s Na‑Series delivers that capability and ESS brings deep experience delivering grid‑scale systems that maximize the value of renewable energy.”
Alsym Energy, founded in 2015, has raised $111 million in total funding, with its latest Series C round completed in February 2024. The company’s Na‑Series batteries are built on a proprietary, physics‑informed AI platform and have demonstrated high cycle life (>10,000 cycles), round‑trip efficiency (>95%), and a wide operating temperature range (–40 °C to 60 °C).
While market reaction data is not available, the partnership positions ESS as a full‑spectrum, non‑lithium provider and could unlock new revenue streams by addressing short‑ and medium‑duration storage needs that have historically been dominated by lithium‑ion technology. The collaboration also aligns with industry trends toward safer, more sustainable battery solutions and could help ESS improve its financial trajectory in the coming years.
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