The 1000-kV Jindongnan-Nanyang-Jingmen UHVAC Demonstration Project after successful commissioning and trial operation has officially entered commercial operation. The Project demonstrates extensive technical innovation and intellectual property rights totally developed in China, with R&D, design and construction all accomplished by Chinese. This project marks China's major breakthrough in long-distance, large-capacity, low-loss UHV core technology and localization of power equipment. It also carries great significance for the optimization of energy resource allocation, and protection of national energy security and power supply.

The construction of the Project has kicked off at the end of 2006. It connects North China Power Grid and Central China Power Grid, starting from Jindongnan Substation in Shanxi Province, passes through Nanyang Switch Station in Henan Province, and ends at Jingmen Substation in Hubei Province, with a total length of 640 km and transmission capacity of 3000 MVA at each end. Shanxi is abundant in coal, while Hubei is abundant in hydro power, the construction of the UHVAC Demonstration project will allocate hydro power and thermal power in an effective way, realize trans-basin power compensation and achieve peak demand adjustment. In addition, the project will promote the construction of large thermal power base and help power plants in Shanxi province turn out electricity from local coal.

During the construction period, SGCC has taken independent innovation as the priority, carried out in-depth researches on more than 200 key UHV technical issues, and made breakthroughs in the fields of voltage standards, electromagnetic environment, overvoltage and insulation coordination, reactive voltage control, lightning-proof technology, high altitude, operation and large grid control, and etc. Through these efforts, SGCC has mastered the core technologies of UHV power transmission and transformation.