On May 21, the 500kV Shinan Line A and Line B Renovation Project, which was surveyed and designed by China Energy Engineering Group Guangdong Electric Power Design Institute Co., Ltd. (Energy China GEDI), was completed and put into operation.

The project expanded the capacity of the 500kV Shinan Line A and Line B, which had been in service for more than 38 years. Upon completion, the power transmission capacity of Guangdong's southern corridor increased by 40%. GEDI was responsible for the survey and design work to reconstruct two major large cross lines, namely Shiziyang and Lianhuashan.

In the Shiziyang large cross, a transmission tower designed in 1987 was in need of reconstruction to meet the growing electricity demand and upgraded wind resistance standards. However, the tower is located in a "golden waterway" with dense shipping, frequent typhoons and ecological sensitivity, posing significant construction challenges. GEDI innovatively proposed an offshore in-situ reconstruction plan for the tower. By utilizing the existing foundation to erect a new tower, the project saved several hundred million yuan in investment. Moreover, by optimizing wind resistance design, developing innovative tower foot flanges, and customizing the foundation for the gin pole, GEDI ensured that the existing foundation met the requirements for the new tower, maximizing engineering value creation. The newly built tower stands at a height of 264.5 meters, equivalent to a 100-story residential building, making it the tallest water-crossing power transmission tower in China to date.