Welcome to a new era in energy. This molten salt battery powers 100,000 homes with 90% efficiency!
The Danish breakthrough in thermal energy storage could dramatically reshape how renewable power is stored and used.
Hyme Energy, in collaboration with Swiss engineering firm Sulzer, has unveiled a 1 GWh molten salt battery capable of powering 100,000 homes for 10 hours with up to 90% efficiency.
The system, demonstrated at Denmark’s MOSS plant, uses molten hydroxide salt—an industrial byproduct—to store electricity as heat at temperatures up to 600°C.
This heat is then released to generate steam for industrial use or electricity, promising a reliable and scalable way to store renewable energy.
The technology offers impressive flexibility: up to 90% efficiency for heat applications and 80–90% for combined heat and power systems, with even modest efficiency in electricity-only use. It also integrates seamlessly with existing infrastructure, enabling heavy industry to decarbonize without costly overhauls. Hyme’s next step is building the world’s largest industrial thermal storage site in Holstebro, expected to save Arla Foods €3 million annually. If scaled successfully, molten salt batteries could become a cornerstone in the global transition to clean, resilient energy systems.