Energy, Renewable Technology
The World's First GWh-Scale Vanadium Flow Battery Goes Online in China
A new kind of battery has crossed into the grid-scale era. The Jimusaer Vanadium Flow Battery Energy Storage Project in Xinjiang — the world's first vanadium redox flow battery (VRFB) to operate at the gigawatt-hour level — is now online, backed by China Huaneng Group and delivered by Rongke Power. At 200 megawatts and 1 gigawatt-hour, it stores enough solar energy to run a small city for hours, and it paired with a one-gigawatt solar plant from day one.
Why flow batteries are different
Unlike the lithium-ion cells in phones and cars, a vanadium flow battery does not store energy in solid material. Instead, two liquids — each carrying vanadium ions at different energy states — are pumped through a central reaction stack where they exchange electrons and generate electricity. To recharge, the flow is reversed. Because power (the stack size) and energy (the tank size) are separate, you can store more for longer simply by adding bigger tanks of liquid. The vanadium itself is never consumed, so the same electrolyte can be reused for decades, and the battery carries a very low fire risk compared with lithium-ion chemistry.
The numbers behind the milestone
The Jimusaer project is built in phases. Station 1 is a 150 megawatt / 750 megawatt-hour system, connected by six 35 kilovolt lines to a planned 220 kilovolt substation. Fully completed, the site reaches 200 megawatts and 1 gigawatt-hour — roughly five hours of storage at full discharge. Analysts estimate that, alongside the co-located solar farm, the system will shift more than 230 million kilowatt-hours of renewable electricity each year from the hours it is generated into the evening hours when demand is highest. The battery is designed for more than 20,000 charge-discharge cycles and a service life exceeding 20 years.
What this proves about long-duration storage
The solar and wind boom has created a new bottleneck: there is now more clean power available than the grid can absorb at any one moment. Short-term lithium storage smooths peaks lasting minutes, but renewable-heavy grids increasingly need four-to-six-hour storage to carry solar energy through the night. Vanadium flow batteries have the chemistry for exactly this job. Rongke Power now has more than 3.5 gigawatt-hours of flow battery projects connected across China, and Jimusaer is the first to demonstrate that the technology can be built, wired, and operated reliably at the scale real utility grids require.
The caveat
Flow batteries are not a universal replacement for lithium-ion. They are bulky and their energy density is low, so they make sense for stationary, long-duration use but not for vehicles or portables. Their economics also depend heavily on vanadium prices and on grids that need hours, not minutes, of storage. Jimusaer's significance is not that flow batteries have won, but that a long-duration option has finally proved itself at utility scale.
Knowledge takeaway: The Jimusaer project in Xinjiang is the world's first GWh-scale vanadium flow battery, at 200 MW / 1 GWh, paired with a 1 GW solar farm; vanadium flow batteries separate power from energy storage by pumping liquid electrolyte through a stack, making them ideal for four-to-six-hour, decades-long grid storage; Rongke Power now operates over 3.5 GWh of flow batteries across China.