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February 24,2026

US's ESS Tech Acquires VoltStorage Expanding Long-Duration Energy Storage

ESS Tech has acquired VoltStorage GmbH’s intellectual property and assets to expand its long-duration energy storage portfolio. The acquisition combines ESS’ iron flow battery platform with VoltStorage’s iron-salt technology, enhancing performance, sustainability, and affordability. VoltStorage’s patents, technical development, and key personnel strengthen ESS’ commercial and technical capabilities.

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