China’s monumental Zhundong-Wannan ±1100 kV ultra-high-voltage direct current (UHVDC) transmission project has achieved a historic energy transmission milestone, delivering over 400 billion kilowatt-hours of electricity since commencing operations in 2019. According to State Grid Xinjiang Electric Power Co., the cumulative transmission volume reached 402.19 billion kWh as of March 27, 2026.
This engineering marvel originates at the Changji Converter Station in Xinjiang Uygur Autonomous Region and traverses an extraordinary 3,293-kilometer route across six provinces and autonomous regions. The infrastructure project passes through Gansu Province, Ningxia Hui Autonomous Region, Shaanxi Province, and Henan Province before concluding in Anhui Province in eastern China.
The transmission system currently maintains three world records for UHV projects: highest voltage level, largest transmission capacity, and longest transmission distance. Since 2021, it has consistently achieved the highest annual transmission volume among all national UHV projects, setting a remarkable national record with an average daily transmission of 169 million kWh.
In 2025 alone, the project transmitted 69.87 billion kWh of electricity, representing nearly 20% of Anhui Province’s total power consumption. This massive energy transfer demonstrates China’s technological leadership in ultra-high-voltage transmission and its commitment to addressing regional energy distribution imbalances by delivering power from energy-rich western regions to high-demand eastern provinces.