On September 15, CHN Energy’s 750 kV Yunshan Substation at the Ma’erdang Hydropower Station has been in operation for two years, transmitting more than 6.55 billion kilowatt-hours of electricity. Rising 3,365 meters above sea level in Tongde County, Hainan Tibetan Autonomous Prefecture, Qinghai Province, it is the highest 750 kV ultra-high-voltage (UHV) substation in China.
The substation is equipped with two 2.1 million kVA transformers, five 750 kV lines, and nineteen 330 kV lines. It serves as a key hub for transmitting hydropower and clean energy from Ma’erdang Hydropower Station and Golog Tibetan Autonomous Prefecture, securing power supply for the Qinghai-Henan UHV direct current project.
Operating in extreme high-altitude conditions, CHN Energy Qinghai Branch Ma’erdang Company has deployed intelligent inspection and online monitoring systems to conduct frequent equipment checks and precision maintenance, ensuring real-time control of operating status.
As a smart 750 kV facility, Yunshan Substation integrates advanced auxiliary control systems that enable data sharing and intelligent interaction with neighboring substations and grid dispatch centers. This enhances grid security and stability, improves regional supply reliability, and strengthens risk resilience. The substation also plays an important role in optimizing water resource use along the upper Yellow River and advancing clean energy development.
