World’s biggest Vanadium Flow Battery Project by Rongke Power goes live in China

In a majestic development, China has commissioned the world’s largest vanadium flow battery energy storage project, marking a major breakthrough in long-duration, grid-scale energy storage and renewable integration. Technology major Dalian Rongke Power announced that the Jimusaer Vanadium Flow Battery Energy Storage Project, located in the Xinjiang Uygur Autonomous Region, officially entered full operation.

The project features a 200 MW / 1,000 MWh (1 GWh) vanadium redox flow battery (VRFB) system with a five-hour discharge duration, making it the first flow battery installation globally to reach the gigawatt-hour scale. Rongke Power said that it is integrated with a nearby 1 GW solar photovoltaic (PV) power plant, enabling excess solar generation to be stored during peak output hours and released when electricity demand is high.

Developed by Rongke Power in partnership with infrastructure major China Three Gorges Corporation (CTG), the project represents a significant step in addressing renewable energy intermittency and grid congestion—key challenges in Xinjiang, a region rich in solar and wind resources. According to project data, the solar-plus-storage system is expected to enable the grid integration of more than 220–230 million kilowatt-hours of additional renewable electricity annually, reducing curtailment and improving overall system efficiency.

CTG estimates that the project will replace the consumption of around 519,000 tonnes of coal each year and cut carbon dioxide emissions by approximately 1.4 million tonnes annually. The coordinated dispatch of solar power using the battery’s five-hour continuous discharge capability is also expected to boost PV utilisation by about 9%.

With a reported investment of RMB 3.8 billion, the Jimusaer facility is designed for intensive daily cycling and long operational life—key advantages of vanadium flow batteries. Unlike lithium-ion systems, VRFBs store energy in liquid electrolytes housed in external tanks, separating power capacity from energy capacity. This design allows for easier scaling, enhanced safety due to non-flammable electrolytes, and stable performance over long lifetimes.

Rongke Power said the project demonstrates that vanadium flow battery technology can operate reliably at unprecedented scale. The company has now connected more than 3.5 GWh of flow battery projects across China, including several of the world’s largest installations.

It is believed that while China dominates large, bespoke VRFB megaprojects—supported by its strong vanadium supply chain—most projects outside China remain much smaller. Still, the successful operation of the Jimusaer project positions vanadium flow batteries as a viable solution for long-duration energy storage and a key enabler of resilient, low-carbon power systems worldwide.