National Grid(US:NGG) Mei Ri Jing Ji Xin Wen·2025-12-31 02:01Group 1: Project Developments - The construction of the back-to-back interconnection projects in Yuchuan-Guizhou, Hunan-Guangdong, and Fujian-Jiangxi has commenced, enhancing power supply stability and resource optimization in these regions [1][3] - The Hunan-Guangdong project, which started on December 27, aims to facilitate flexible interconnection between the State Grid and the Southern Grid, improving power supply stability in Hunan [1] - The Yuchuan-Guizhou project, initiated on December 26, will strengthen interconnectivity between the State Grid and Southern Grid, benefiting both Chongqing and Guizhou [1] - The Fujian-Jiangxi project, which began on December 25, will establish Jiangxi's first flexible DC back-to-back converter station, creating a high-speed interconnection channel for the two provinces [1] Group 2: Technical Insights - The back-to-back interconnection project involves a converter station that connects asynchronously operating power grids through an "AC-DC-AC" conversion process, allowing for safe and efficient power transfer [2] - This technology acts as a high-efficiency "power converter" for two regional power grids, enabling bidirectional power exchange [2] Group 3: Investment and Infrastructure - A total investment of 24.4 billion yuan (approximately 3.4 billion USD) has been approved for five back-to-back interconnection projects, which will include the construction of five converter stations with a capacity of 3 million kilowatts each and a total line length of 1,227 kilometers [3] - The projects include the Yuchuan-Guizhou and Hunan-Guangdong projects led by the State Grid, while the Hunan-Guizhou project is led by the Southern Grid [3] Group 4: Market Implications - The acceleration of building a unified national electricity market is aimed at facilitating cross-province electricity trading and optimizing resource allocation [4] - The completion of these interconnection projects is expected to significantly enhance regional power support capabilities and provide a solid physical foundation for regular cross-grid electricity trading [4]