Zhejiang Changxing: Gird-side Energy Storage Station Upgrades to a 'Giant Power Bank' to Meet Peak Summer Demand

On June 13, maintenance technicians of the State Grid Changxing Power Supply Company were replacing and testing lead-carbon batteries.

Recently, the 10 kV Zhicheng grid-side energy storage station in Changxing, Huzhou City, Zhejiang Province, began an upgrade and capacity expansion, with over 20,000 lead-carbon batteries being replaced in an orderly manner. Upon completion, the station's capacity will increase to 26.3 MWh, doubling the discharge time from the original two hours to four hours. Therefore, when the grid requires support, the station can supply electricity for four hours, effectively alleviating the grid's pressure during the upcoming peak summer demand.

The 10 kV Zhicheng grid-side energy storage station in Changxing, the first of its kind in China, was operational in May 2020. It is reported that this storage station, much like a "giant power bank," primarily plays the role of peak-shaving and valley-filling. That is, during periods of low electricity demand, it charges the storage batteries; during peak demand periods, the batteries discharge to fill the city's power gap. Assuming each household uses 10 kWh per day, the station can supply electricity to 2,600 households for one day.