ESS Tech, Inc. (GWH) announced on February 18, 2026 that it has acquired the intellectual property and assets of VoltStorage GmbH, a pioneer in iron‑salt battery technology. The transaction adds VoltStorage’s patents, technical development work, and a team of executive and engineering personnel to ESS Tech’s existing iron‑flow battery platform, broadening the company’s long‑duration energy storage capabilities.
The acquisition is designed to accelerate innovation and position ESS Tech at the forefront of the growing long‑duration energy storage market. By integrating VoltStorage’s iron‑salt chemistry into its iron‑flow architecture, ESS Tech can offer a more flexible, cost‑effective solution that serves utilities, renewable developers, and industrial customers. The move strengthens the company’s competitive position against peers such as EOS Energy and Energy Vault, which also target multi‑day storage.
Management said, "This acquisition accelerates our mission to provide clean, reliable, and affordable energy storage solutions worldwide. 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." The quote underscores the strategic intent to merge complementary expertise and accelerate product development.
ESS Tech has been navigating a challenging financial environment, with a high cash burn rate and recent financing rounds to bolster liquidity. The deal value was not disclosed in the announcement, and no market reaction data were reported. The acquisition, however, is a key step in the company’s broader strategy to strengthen its technology portfolio while managing financial risk.
The long‑duration energy storage market is projected to grow significantly, with utilities expected to be the largest end‑user segment. VoltStorage’s technology, backed by European Investment Bank financing, offers a sustainable alternative to lithium‑ion batteries, aligning with the global shift toward renewable integration and grid stability. The acquisition positions ESS Tech to capture a larger share of this expanding market while leveraging its existing iron‑flow platform.
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