Denmark heats up green innovation with next-gen molten salt battery

In a recent article, Glass Almanac highlights that Denmark has made a significant breakthrough in renewable energy with the launch of an innovative molten salt battery, developed by Hyme Energy in partnership with Sulzer. 

This cutting-edge thermal energy storage system can supply electricity to up to 100,000 homes for 10 hours, boasting an impressive efficiency of up to 90 per cent. The technology promises to advance affordable and efficient energy solutions for both residential and industrial sectors.

Unlike traditional lithium-ion batteries, this system stores energy as heat by converting electricity into thermal energy held in molten salt heated to 600°C. When electricity is needed, the stored heat generates steam to produce power or directly fuels industrial processes. This approach offers a cleaner alternative for industries that rely heavily on heat, including agriculture, textiles, and chemical manufacturing, helping to drastically cut carbon emissions.

The molten salt system delivers remarkable efficiency: 90 per cent when used for direct industrial heat, 80-90 per cent for combined heat and power, and around 40 per cent when producing electricity alone. Its strength lies in applications requiring heat, making it ideal for energy-intensive industrial operations. Danish dairy giant Arla Foods expects to save up to 3 million euros annually by adopting this technology.

Hyme Energy successfully demonstrated the technology with its MOSS prototype in Esbjerg in April 2024, confirming its technical viability and easy integration into existing infrastructure. The company now aims to scale up by building the world’s largest industrial thermal storage facility in Holstebro, Denmark.

Sulzer’s expertise in handling high-temperature molten salt, gained from solar thermal projects in China, was crucial in overcoming challenges like corrosion and heat loss.

Environmentally, the molten salt battery stands out by using recyclable, non-toxic materials, avoiding hazardous chemicals common in chemical batteries. Its ability to store excess renewable electricity from wind and solar helps stabilize the grid and supports the transition to low-carbon energy.

Hyme Energy’s molten salt technology could become a cornerstone in Europe’s green energy transition, delivering both electricity and industrial heat efficiently. If successful, it could be adopted worldwide, enhancing energy security and driving a global shift toward sustainable energy.

By Naila Huseynova