The Chengde Shuangluan 10 MW / 40 MWh national demonstration vanadium flow battery project in Hebei Province has completed its main construction works and entered the final stage of pre-commissioning fine-tuning, according to supplier Hebei Jiantou Fansheng Energy Storage Technology Co. (Fansheng Energy Storage).
Site work already completed includes equipment hoisting, piping installation, cable connection and electrolyte filling. With a four-hour duration, the installation qualifies as long-duration energy storage and is positioned as a key storage project for the region's new power system.
Commissioning progresses in stages
Debugging teams are working in groups, sequentially testing the battery management system's sub-control cabinets and main cabinet, the UPS power supply, the temperature control system and equalizers. Interim testing indicates that the system's technical indicators all meet design requirements. Preparations for grid-connection ("suo wang") tests are advancing in an orderly way, putting the project into the final sprint before it enters operation.
Why all-vanadium flow was chosen
The project adopts an all-vanadium flow battery route, selected for safety and reliability, long cycle life and stable performance. Once commissioned, it is expected to effectively improve the region's ability to absorb renewable energy generation — a recurring justification for flow battery deployments in provinces with fast-growing wind and solar capacity.
Vanadium flow batteries store energy in liquid electrolytes held in external tanks, with duration set largely by electrolyte volume rather than by the number of cell stacks — a design feature that underpins their use in multi-hour grid applications.
Supplier and longer-term ambitions
Fansheng Energy Storage supplied the storage equipment and full-cycle on-site technical services for the project, drawing on the flow battery expertise of its parent, Hebei Fansheng Technology Co. The company said it will continue to focus on the all-vanadium flow battery segment, iterating core technology and improving its project service system.
The commissioning milestone comes amid a broader scaling-up of Chinese flow battery capacity. The Hubei Province New Energy Storage Pilot Demonstration Project — a 50 MW / 200 MWh installation equipped with 100 units of all-vanadium flow battery systems — was commissioned in January 2026 after being built in less than four months.
This article was assisted by AI analysis. Please refer to the original source for official information.