en.Wedoany.com Reported - On June 10, the main building construction of the Xiang-Qian Back-to-Back Converter Station for the Hunan-Guizhou Flexible Power Interconnection Project, a key project in China's 14th Five-Year Plan for electric power, officially commenced, marking the full entry of the project into the civil construction phase.

This project is an important livelihood and green project that implements the national new energy security strategy and promotes the broader optimization of energy resource allocation. With a total investment of nearly 5 billion yuan, the project involves constructing one back-to-back converter station with a capacity of 3,000 MW in Tongren, Guizhou, along with supporting AC transmission lines on both the Hunan and Guizhou sides. Once completed and operational, it will form an energy transmission channel for cross-provincial power mutual assistance and surplus-deficit complementarity, effectively addressing challenges such as regional grid supply-demand imbalances, high pressure for new energy integration, and insufficient flexibility in cross-provincial dispatch. It will enhance the security and supply reliability of the regional grid, supporting the construction of a new power system and the achievement of the "dual carbon" goals.

Since the initiation of the "three connections and one leveling" construction tasks on December 25, 2025, CSG EHV Power Transmission Company has focused on the national strategy for stabilizing growth and expanding investment, accelerating the project's construction pace and scientifically coordinating the work. According to Zhu Jintao, Senior Manager of the Infrastructure Department at the Guiyang Bureau of CSG EHV Power Transmission Company, the project construction team innovatively applied construction techniques such as controlled blasting excavation and graded layered backfilling, effectively overcoming challenges in mountainous terrain. All builders remained dedicated and overcame difficulties, efficiently completing over 1.5 million cubic meters of earth and rock excavation and filling, finishing the "three connections and one leveling" tasks in just five months.

It is understood that the civil construction phase requires high construction precision and poses significant safety management challenges. The main building of the converter station is the core control project of the entire project, encompassing key structures such as large-span valve halls, GIS rooms, main grounding grids, equipment foundations, and structural supports. The structural processes are complex, construction standards are stringent, and technical integration is high. Additionally, the project is planned to be commissioned before the peak summer season in 2027. To reserve a reasonable construction period for electrical equipment installation, the civil construction must be completed and handed over by the end of this year, leaving only six months of effective construction time. During this period, challenges include construction during the flood season and the installation of large-span valve hall steel structures. CSG EHV Power Transmission Company will increase investment in manpower, materials, and machinery, achieving a mechanization rate of over 85%.

"The quality and progress of the main building construction directly determine the pace of subsequent key stages such as electrical equipment installation, system commissioning, and grid connection, making it the top priority for ensuring the efficient implementation and safe operation of the project," said Zhang Xuebo, Deputy Manager of the Major Projects Department II at CSG EHV Power Transmission Company. "We will adhere to the construction principles of safety first, quality-oriented, and continuous improvement, targeting the handover of civil works within the year. By utilizing mechanized, digital, and green construction techniques and management methods, we will scientifically coordinate the construction schedule to ensure the project is completed and commissioned on time."

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