The project provides a total installed capacity of 200 MW / 1,000 MWh, enabling up to five hours of continuous discharge to support long-duration energy storage for utility-scale grid operation. Xinhua Ushi ESS vanadium flow battery project by Rongke Power. Rongke Power A firm in China has announced the successful completion of world's largest vanadium flow. . China has established itself as a global leader in energy storage technology by completing the world's largest vanadium redox flow battery project. This. . Dalian-headquartered Rongke Power has completed the construction of the 175 MW/700 MWh vanadium flow battery project in China, growing its global fleet of utility-scale projects to more than 2 GWh.