Ordos Laboratory has demonstrated the continuous operation of an MWh-level high-temperature solid particle thermal energy storage pilot system at Dalu Industrial Park in Juungar Banner, marking a crucial step in transforming ordinary sand into a functional energy storage medium.

The pilot system builds upon the innovative "sand thermal battery" concept developed by Tsinghua University's research team led by professors Wei Fei and Zhang Chenxi. The system utilizes high-power electromagnetic induction technology to convert intermittent wind or solar power, as well as low-cost off-peak grid electricity, into thermal energy, which is then stored in specially processed sand particles. When needed, the stored heat can either be delivered directly for industrial use or converted back into electricity, providing a reliable solution for balancing supply and demand in renewable energy grids.

A key achievement of this technology lies in overcoming longstanding technical challenges, including sand's inherently low thermal conductivity and energy losses in induction heating systems. The pilot system operates within an impressive temperature range of 600–1500 C, achieves an energy density of 120–450 Wh/kg, and maintains a charge-discharge efficiency exceeding 90 percent. These performance metrics highlight its potential as a cost-effective, scalable alternative to conventional battery storage, particularly for high-temperature industrial applications.

The continuous operation of this pilot system not only validates the technical feasibility and advancement of high-temperature solid particle thermal storage but also lays a solid foundation for the systematic optimization of subsequent process parameters and the implementation of industrial demonstration projects at 100 MWh and GWh levels.