China has achieved a significant milestone by connecting the world's first GWh-scale supercapacitor-energy storage project to the grid in northwest China. The Jiayuguan NingSheng project, invested by China National Nuclear Corporation, utilizes a hybrid configuration of lithium batteries and supercapacitors to support grid stability, integrate renewables, and enable long-duration energy shifting and peak shaving. Located in a key renewable energy hub in Gansu province, this project showcases the potential for supercapacitors to provide millisecond-level response for frequency regulation and rapid grid stabilization, highlighting innovative solutions for the transition to a more sustainable energy system.