Yunnan’s Yongren 100MW/400MWh Vanadium Flow Battery Project Achieves 220 kV Substation Grid-Connection
Date: 10 Oct 2025 |
Source: VRFB-Battery WeChat, 9 October 2025
The Yongren vanadium flow battery (VFB) energy storage project has successfully completed grid-connection of its 220 kV step-up substation, marking a major milestone on the path to full operation.
Built by China State Construction Third Engineering Bureau (CSCEC Third Bureau), the grid-tie energisation signifies that critical transmission infrastructure is ready to support large-scale storage dispatch and system testing.
The Yongren project is being delivered in two phases with a combined capacity of 300MW/1200MWh. Phase I provides 100MW/400MWh, with Phase II adding a further 200MW/800MWh.
As a national priority technology in the new-energy sector, vanadium flow storage enhances security of supply and supports a cleaner energy mix.
Project highlights
- 220 kV substation successfully grid-connected, enabling subsequent commissioning of the storage plant.
- Two-phase build: 100MW/400MWh (Phase I), 200MW/800MWh (Phase II); total 300MW/1200MWh.
- System scope includes battery container halls, PCS step-up cabins, balancing cabinets and the step-up substation.
Once fully commissioned, the Yongren VFB installation will boost peak-shaving and frequency regulation capabilities, smooth renewable intermittency, and help deliver reliable power to households and industry. The project supports the build-out of Yunnan’s national