By ESS news
China’s largest supercapacitor-based hybrid energy storage system has been successfully connected to the power grid in northwest China, marking a milestone for hybrid energy storage systems based on supercapacitors and lithium.
The Jiayuguan NingSheng 500 MW/1,000 MWh independent energy storage project, invested by China National Nuclear Corporation (CNNC), completed commissioning and achieved grid connection in the early hours of December 30, 2025, according to official disclosures. The project is located in Jiayuguan, Gansu Province, within the Jiaxi Photovoltaic Industrial Park, a major renewable energy hub in northwest China.
The project uses a hybrid configuration that combines 475 MW/1,000 MWh lithium iron phosphate (LFP) batteries with a 25 MW supercapacitor system capable of discharging in 60 seconds. While battery storage provides long-term energy shifting and peak shaving, the supercapacitor segment delivers millisecond-level response, enabling frequency control, inertial support and rapid grid stabilization.
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