ESS Tech and Alsym Energy partnership marks a notable step in the battery storage market. ESS Tech, Inc. announced a letter of intent with Alsym Energy to add 8.5 GWh of sodium-ion cells and modules to its energy storage portfolio. As a result, ESS expands beyond long-duration storage and moves into short- and medium-duration battery energy storage segments.
The agreement brings together two battery technologies that serve different use cases. ESS focuses on iron flow energy storage systems for long-duration applications. Meanwhile, Alsym Energy supplies Sodium-ion Battery technology for projects that need high power, fast cycling, and rapid response. Together, the companies aim to serve utilities, independent power producers, data centers, and commercial and industrial customers with a broader range of storage options.
ESS Tech and Alsym Energy partnership expands battery offerings
ESS Tech signed the letter of intent to strengthen its product lineup with sodium-ion batteries. The company said the partnership will add 8.5 GWh of sodium-ion cells and modules to its portfolio. Therefore, ESS can address customer demand across more project types and durations.
ESS has built its business around long-duration energy storage. Its Energy Base platform targets applications that require 8 to 24 hours of storage. Now, with Alsym’s Na-Series sodium-ion batteries, ESS can also support shorter-duration and medium-duration installations. This wider portfolio may help customers match battery technology to specific performance needs.
Drew Buckley, Chief Executive Officer of ESS, said sodium-ion and iron flow are complementary technologies. He explained that Alsym’s sodium-ion Na-Series suits short- and medium-duration applications where high power and rapid response matter most. That comment highlights the strategic logic behind the partnership. Instead of relying on one battery chemistry, ESS now plans to offer multiple solutions for different grid and commercial demands.
ESS Tech and Alsym Energy partnership focuses on sodium-ion technology
Alsym Energy developed its sodium-ion batteries as a non-flammable alternative to Lithium-ion systems. In addition, the company says its batteries do not require complex HVAC systems. That feature may simplify deployment in certain settings and improve operating flexibility. The batteries also use materials that are not sourced from foreign entities of concern, which may appeal to customers focused on supply chain resilience.
Mukesh Chatter, Chief Executive Officer of Alsym Energy, said the partnership responds to rising demand for battery solutions beyond lithium-ion. He added that Alsym developed its Na-Series batteries with the help of a proprietary AI platform for battery development. That detail underlines Alsym’s focus on product design and performance optimization.
Sodium-ion batteries continue to draw attention across the energy storage sector. They offer another option for developers and operators who want dependable storage technologies for a range of use cases. In this case, Alsym’s systems strengthen ESS’s ability to compete in more segments of the market.
ESS Tech and Alsym Energy partnership supports broader customer demand
ESS plans to offer both its iron flow systems and Alsym’s sodium-ion batteries to several customer groups. These include utilities, independent power producers, data centers, and commercial and industrial users. Each of these markets has different operating needs. Therefore, access to both long-duration and shorter-duration systems gives ESS more flexibility when responding to project requirements.
For example, utilities often need different storage profiles depending on grid balancing and peak demand patterns. Data centers may prioritize rapid response and reliable power support. Commercial and industrial customers may seek systems that align with operational cycles and energy cost management. Because of this, a broader portfolio can improve ESS’s positioning in competitive bidding and project development discussions.
ESS Tech company background and recent figures
ESS Tech was established in 2011 and is based in Wilsonville, Oregon. The company manufactures long-duration iron flow energy storage systems using iron, salt, and water. Its core focus remains long-duration storage, especially through its Energy Base platform.
According to the company update, ESS generated $1.58 million in revenue over the last twelve months. The article also noted that ESS reported fourth-quarter 2025 earnings with a reduction in losses, even as full-year revenue declined. Management has increasingly centered its strategy on the flagship Energy Base product. That shift contributed to improved financial results.
In separate corporate news, director Michael Niggli said he plans to resign from the board of directors, as well as from the audit and nominating committees, at ESS Tech’s 2026 annual meeting. The company stated that his decision did not stem from disagreements over operations or policies.
ESS Tech and Alsym Energy partnership may shape future growth
The ESS Tech and Alsym Energy partnership reflects a practical expansion strategy. ESS keeps its long-duration iron flow business in place. At the same time, it adds sodium-ion battery capacity to reach new applications. This move could help the company participate in a larger share of the energy storage market.
Moreover, the 8.5 GWh addition gives the announcement real scale. It shows that the partnership is not a small pilot effort. Instead, it signals an intent to build meaningful supply and commercial reach. As energy storage demand grows across utilities, data centers, and industrial markets, companies with broader product portfolios may gain an advantage.
Overall, ESS and Alsym have positioned this partnership around complementary battery technologies, clearer customer choice, and wider market coverage. If the companies execute on their plans, they could strengthen ESS’s role in both long-duration and shorter-duration storage projects.
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