ESS to Accelerate Sodium-Ion Battery Energy Storage System Development Following Surging Customer Interest
ESS accelerates development of a U.S.-made sodium-ion battery energy storage system after customer demand for safer, domestically sourced alternatives to lithium-ion exceeded expectations, with early-stage opportunities approaching $1 billion.
ESS Tech announced strong early customer engagement for its planned sodium-ion battery energy storage system, targeting short- and medium-duration applications typically served by lithium-ion systems. Since partnering with Alsym Energy in April 2026, the company has seen demand surpass expectations with minimal marketing efforts, generating early-stage opportunities valued at nearly $1 billion. ESS is now accelerating development of its sodium-ion platform to meet urgent market needs for safer, domestically produced energy storage solutions.
The surge in interest reflects broader sector challenges, as data centers, critical infrastructure, and utilities seek storage that avoids lithium-ion’s fire risks, insurance costs, and supply chain vulnerabilities tied to foreign entities. Sodium-ion technology addresses these concerns by eliminating thermal runaway risks and relying on abundant, domestically available materials instead of constrained lithium supplies. Customers prioritize systems that can be deployed quickly, meet aggressive timelines, and reduce exposure to geopolitical supply chain disruptions.
To reallocate capital toward higher-growth sodium-ion opportunities, ESS will streamline operations at its Wilsonville facility, reducing expenses and cash burn while continuing development of its long-duration iron flow battery technology for other applications. The company plans to introduce sodium-ion container, rack, and hardware solutions, alongside digital software to optimize battery and system performance, supporting the expanding pipeline of customer projects.
CEO Drew Buckley stated that the unprecedented demand underscores the urgency for alternatives to traditional lithium-ion systems, emphasizing ESS’s focus on high-growth markets with differentiated technology. The company aims to deliver American-made energy storage solutions while maintaining its commitment to long-term innovation, positioning itself to create value for customers and shareholders through proven execution capabilities.