A Landmark Achievement in Long-Duration Storage
China Three Gorges Corporation's integrated solar-plus-storage project in Jimsar county, Xinjiang, officially entered commercial operation in May 2026. The centerpiece of this massive infrastructure is a 200MW/1,000MWh all-vanadium redox flow battery system, which currently stands as the largest of its kind in China. This monumental project highlights the accelerating deployment of long-duration energy storage (LDES) technologies to support the country's ambitious renewable energy targets.
Technical Specifications and Inherent Safety
The state-of-the-art system boasts a 5-hour discharge duration and comprises 240 individual energy storage units. Notably, the entire system is fully domestically produced, showcasing China's robust and self-reliant manufacturing capabilities in the LDES sector. It offers an impressive lifecycle of over 20 years and inherently eliminates thermal runaway risks, addressing one of the most significant safety concerns associated with traditional lithium-ion batteries.
"The 1GW solar project is capable of supplying 1.72 billion kWh, providing a stable and reliable power supply to the regional grid."
This deployment underscores the critical role of vanadium flow batteries in integrating high shares of variable renewable energy. By providing long-duration discharge capabilities, the system ensures that solar power generated during peak daylight hours can be efficiently stored and dispatched during evening peaks or periods of low solar irradiance. The 5-hour duration is particularly effective for daily shifting of solar generation, maximizing the capacity value of the paired 1GW solar array.
The successful commissioning of this 1,000MWh facility sets a new benchmark for grid-scale energy storage projects globally. It demonstrates the technical viability, economic feasibility, and operational safety of flow battery technology at unprecedented scales, paving the way for future mega-projects in the global transition toward decarbonized power systems.
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