Following 24 hours of trial operation, the 500 kV transmission line supporting the expansion of two 1-million-kilowatt coal-fired generating units at Jiangsu Guoxin Shazhou Power Generation Co Ltd was officially put into operation on May 26. This is one of the first supporting transmission projects for clean and efficient coal-fired power generation under the "build first, retrofit later" policy in Jiangsu Province.
With a total investment of 8.24 billion yuan ($1.14 billion), the Guoxin Shazhou expansion project includes the construction of two high-efficiency, ultra-supercritical 1-million-kilowatt coal-fired power units with secondary reheat technology, along with related auxiliary facilities. . Once operational, the project is expected to generate 10 billion kWh of electricity annually, enough to meet the annual electricity consumption of about 3 million households. The generated power will be transmitted directly to the main grid of the Southern Jiangsu Power Grid for local consumption.
To ensure reliable power transmission for the project, State Grid Suzhou Power Supply Company launched construction of the 500 kV transmission line in August 2024. The project consists of three components: building a new 12.4-kilometer 500 kV Zhangjiagang-Jinfeng power line, setting up 41 new transmission towers, and upgrading intervals at both the Jinfeng and Zhangjiagang 500 kV substations.
During construction, State Grid Suzhou Power Supply Company coordinated closely with all participating units, local governments and power suppliers. The company optimized the route planning and overcame challenges such as complex terrain, multiple line crossings, numerous upgrade tasks and intricate power outage schedules to ensure the project's timely commissioning.
The Guoxin Shazhou Power Plant is currently accelerating full-capacity testing of the two generating units, with one unit expected to be connected to the grid by the end of June.
"Upon completion, this project will raise the share of clean coal-fired capacity in Suzhou's power grid and enhance the role of coal power as a 'ballast' and 'stabilizer.' It is of great significance for ensuring safe and stable grid operation during the summer peak and meeting the electricity demand of economic and social development in southern Jiangsu," said Zhu Haifeng, a third-level staff member at State Grid Suzhou Power Supply Company.
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