China’s Power Grid Breakthrough: Hanzhong 750kV UHV Project Spans the Snowy Qinling Mountains

Executive Summary

On December 23, 2025, the Hanzhong 750kV Ultra-High Voltage (UHV) transmission and substation project was officially commissioned in Shaanxi, China. This landmark project marks the Shaanxi power grid’s entry into the UHV era, significantly enhancing regional energy reliability and supporting the transition to clean energy.

Engineering Excellence in Extreme Conditions

The 459km transmission line is a feat of modern engineering, being the first 750kV UHV line in China to cross the Qinling Mountains North-to-South. The project faced and overcame unprecedented challenges:

• High Altitude Performance: With the majority of the route situated at altitudes above 1,200 meters, the project required equipment designed for thin air and low-pressure environments—a challenge often addressed by specialized high altitude switchgear.
• Heavy Ice Resilience: It is the first 750kV line in the country to span a 40mm heavy ice area, necessitating robust mechanical and insulation performance.
• Ecological Preservation: Spanning 19 months of construction, the project strictly adhered to green principles, ensuring the protection of the sensitive Qinling ecosystem.

Strategic Impact and Sustainability

As a key component of China’s “14th Five-Year Plan,” the project is expected to meet regional electricity demands for the next 15 years while reducing CO2 emissions by approximately 15 million tons annually. This highlights the growing global demand for efficient distribution transformers and dry type transformers in sustainable grid designs.

XBRELE Insights: From UHV Technology to Industrial Reliability

The success of such massive UHV projects underscores the reliability of the Chinese power equipment supply chain. At XBRELE, we apply the same rigorous engineering standards to our range of medium-voltage vacuum circuit breakers and switchgear components.

Our vacuum contactors and epoxy insulation parts are engineered to perform in the same demanding environments seen in the Hanzhong project, including high-altitude mining sites and extreme weather conditions.

Need reliable MV/HV solutions for your next project? Contact XBRELE Engineeringfor expert support.