A new molten hydroxide salt battery was unveiled at the MOSS facility in Esbjerg, Denmark. The system stores renewable electricity as heat by melting hydroxide salt to around 600 °C (1,112 °F) and later discharges it as steam for industrial or grid use.
Capacity totals one gigawatt-hour, sufficient to power 100,000 homes for ten hours. Efficiency reaches up to 90 percent for industrial heat applications, with 80–90 percent in combined heat‑and‑power mode and about 40 percent for electricity generation alone.
Hydroxide salt is an industrial byproduct from chlorine production. Corrosion control innovations enable safe operation at high temperatures. Energy retains integrity for up to two weeks in a two‑tank thermal storage setup.
Demonstrator plant began operation in April 2024 as part of MOSS consortium involving Semco Maritime, Sulzer, Alfa Laval and others. Project outcome validated scale and commercial potential.
Sulzer contributes decades of expertise in molten salt pump engineering. Joint development aims for commercialization and deployment of the full-scale system in industrial and grid settings.
System offers a competitive alternative to lithium‑ion batteries for long-duration storage. It overcomes intermittency of wind and solar, decarbonizes process heat, and supports clean industrial expansion.
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