Portland, OR — February 18, 2026 — Leads & Copy — ESS Tech, Inc. has acquired the intellectual property and assets of VoltStorage GmbH, combining iron flow battery expertise and iron-salt battery technology to create a flexible, cost-effective long-duration energy storage solution.
According to ESS, the combined platform will set a new industry standard for performance, sustainability, and affordability. The acquisition adds VoltStorage’s portfolio of patents and technical development work to ESS’ existing intellectual property base. ESS also gains access to skilled personnel with experience in electrochemistry, materials science, and technology development through the transaction.
ESS believes the combined capabilities will accelerate strategic growth, expand market reach, and position the company at the forefront of long-duration energy storage solutions. The company said the resulting solution will enable utilities, renewable developers, and industrial customers to discharge energy over extended durations to improve grid reliability and increase the usable value of intermittent renewable generation, delivering the industry’s lowest Levelized Cost of Energy (LCOE).
Key benefits of the combined technology include:
- Flexibility: Addresses a range of diverse applications, from grid-scale storage to industrial microgrids.
- Lowest Cost Long-Duration Storage: Leverages abundant, sustainable materials to deliver economics.
- Sustainability and Scale: Iron-based chemistry ensures environmental responsibility and operational safety.
- Enhanced U.S. Manufacturing Platform: Deploys international development expertise at ESS’ American manufacturing facility.
“This acquisition accelerates our mission to provide clean, reliable, and affordable energy storage solutions worldwide,” said Drew Buckley, CEO of ESS. “By combining decades of iron flow battery expertise across two companies at ESS, we are accelerating innovation to create the most advanced iron-salt battery platform for long-duration storage.”
ESS (NYSE: GWH) was established in 2011 with a mission to accelerate decarbonization safely and sustainably through longer lasting energy storage. Using easy-to-source iron, salt, and water, ESS iron flow technology enables energy security, reliability and resilience. The company builds flexible storage solutions that allow customers to meet increasing energy demand without power disruptions and maximize the value potential of excess energy.
Source: ESS Tech, Inc.
