Core Insights - The Jiangsu Yancheng to Zhenjiang ±200 kV DC transmission project has been completed and put into operation, marking China's first hybrid AC-DC cross-river project [1] - The project will deliver over 6 billion kWh of electricity annually to the Yangtze River Delta load center, significantly enhancing regional grid regulation capabilities [1] Group 1 - The Yancheng-Zhenjiang DC Phase II project has a total length of approximately 228 kilometers and a transmission capacity of 1.2 million kW, passing through three cities: Huai'an, Yangzhou, and Zhenjiang [1] - The new DC transmission line includes 47 kilometers that are co-located with 500 kV AC lines, and two new converter stations have been built, tripling the existing cross-river transmission capacity without adding new crossings [1] - The hybrid AC-DC grid allows for more flexible, long-distance, and high-capacity power transmission, effectively addressing the temporal and spatial imbalance between power generation and consumption in Jiangsu [1] Group 2 - The project showcases technological innovation, with nearly 1,000 personnel involved at peak construction and the use of advanced equipment such as heavy-duty drones for cable deployment, enhancing both construction efficiency and safety [2] - Jiangsu has established a backbone network of ultra-high voltage "one AC and four DC" and 500 kV "seven vertical and seven horizontal" grids, and has launched the country's first "AC to DC" embedded transmission project with the Yancheng-Zhenjiang DC Phase I project [2] - With the operation of the Yancheng-Zhenjiang DC Phase II project, Jiangsu has preliminarily formed a provincial hybrid AC-DC grid structure, increasing the "north-to-south" transmission capacity to approximately 25 million kW [2]