Recently, the nation’s largest grid-side standalone energy storage demonstration project—constructed by China Power Construction Corporation—the 500 MW/3 GWh Baotou Weijun grid-side standalone energy storage pilot in Inner Mongolia—has successfully passed its acceptance inspection. This milestone provides a critical practical model for the large-scale development of long-duration energy storage in China.

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After commissioning, the project can deliver up to 3 million kilowatt-hours of clean electricity per discharge cycle, equivalent to the total capacity of 300,000 household 10-kilowatt-hour power banks. It will serve as a key reference for China’s large-scale deployment of long-duration energy storage and provide strong support for establishing a global benchmark for standalone energy storage projects characterized by “large capacity, high quality, and rapid construction.” This marks a new high in China’s capabilities in both the application of large-scale grid-side standalone energy storage technologies and related engineering construction. The project will not only help the Inner Mongolia power grid substantially increase its capacity to integrate wind, solar, and other renewable energy sources, effectively alleviating peak–valley load imbalances and providing robust assurance for the safe and stable operation of the power system; it will also stimulate the localized development of the energy-storage industry chain. As such, the project holds significant positive implications for advancing China’s energy transition and the construction of a new-type power system.