On September 30, the 49.8MW/99.6MWh grid-side energy storage power station of Suqian Zhonghe East Line New Energy in Jiangsu was officially connected to the grid. This marks the official operation of Jiangsu's first grid-side independent energy storage project constructed in a regionally decentralized manner, providing a new model for the development of grid-side energy storage.
As a unit under unified dispatch and management, grid-side energy storage power stations support the grid by storing and releasing electricity to achieve load "peak shaving and valley filling," improving the stability and safety of the power system. In areas rich in new energy sources such as wind and solar power, energy storage power stations have become an effective means to balance clean energy consumption and ensure the healthy development of new energy.
In recent years, new energy, primarily wind and solar power, has seen rapid development in Jiangsu. Take Suqian as an example: by the end of September 2025, the city's installed capacity of new energy had exceeded 6.652 million kilowatts, accounting for 79.9% of the city's total installed power capacity. While large-scale new energy grid connection enhances energy supply security, its high penetration rate has led to insufficient consumption capacity in some areas, and even cause reverse power flow leading to equipment overload, impacting grid safety and stability. To address this, State Grid Suqian Power Supply Company actively explored new paths for energy storage development in areas with high proportions of new energy access in Siyang County and Sihong County, Jiangsu Province, innovatively guiding social capital to participate in constructing energy storage stations by utilizing idle site resources such as decommissioned substations. Among these efforts, four decommissioned 35kV substations (Qianxu, Chuancheng, Peixu, and Xinyuan) in Siyang were selected to build a 49.8MW/99.6MWh regionally decentralized grid-side independent energy storage power station.
Through careful design, the four energy storage stations, though geographically dispersed across different towns, can operate under coordinated control. Suqian Power Supply Company innovatively adopted a "central station + sub-station" communication architecture. The Qianxu energy storage station was selected as the secondary system central station, equipped with a complete secondary system, while the other sub-stations were internally networked with simplified configurations, enabling data aggregation prior to centralized transmission. With this solution, when the grid requires the energy storage stations to adjust their operating mode, dispatch instructions from the provincial company's control center are sent to the Qianxu central station, which then distributes them simultaneously to each sub-station. The four energy storage stations then charge and discharge synchronously, providing effective support for the power grid in various areas of Siyang. This technical solution represents the first application of its kind in China. Calculations show that while ensuring reliable system operation, it can reduce the project's one-time construction cost by approximately 10 million yuan compared to traditional energy storage construction methods.
"After the Zhonghe Siyang energy storage station is put into operation, it is expected to charge and discharge over 40 million kWh annually, provide approximately 50,000 kW of short-term emergency peak-shaving capacity, and meet the electricity demand of more than 10,000 households. Simultaneously, the project can flexibly enhance the local consumption capacity for approximately 12,000 kilowatts of distributed photovoltaic power across the four regions, reducing annual carbon dioxide emissions by 50,000 tons and saving 16,000 tons of standard coal consumption," introduced Chen Taotao, a specialist from the Development and Planning Department of Suqian Power Supply Company.
Under the current national energy strategy of deepening the "dual carbon" (carbon peaking and carbon neutrality) goals, the innovative "turning waste into treasure" approach by State Grid Suqian Power Supply Company—building regionally decentralized grid-side energy storage using decommissioned substations—has not only effectively addressed the practical challenge of clean energy consumption in the regional power grid but has also provided an innovative pathway for developing new-type independent energy storage in Jiangsu amidst constraints on land and grid resources. (Meng Fei)
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