On September 29, 2022, the first UHV AC project in Southwest China, the Sichuan-Chongqing 1000kV UHV AC Project of State Grid Corporation of China, officially started construction.

Sichuan-Chongqing UHV Project

It is understood that the project will build four UHV substations in Sichuan Ganzi, Tianfu South, Chengdu East and Chongqing Tongliang, with a substation capacity of 24 million kVA. The new double-circuit UHV line of 658 kilometers, with a total investment of 28.8 billion yuan, is scheduled to be put into operation before the summer peak in 2025.

At the same time, in order to optimize the grid structure of the regional power grid, enhance the power supply guarantee capability of Sichuan Province, support large-scale clean energy development, and effectively undertake the implementation of UHV power transmission, State Grid and Sichuan Province have also jointly launched a new round of major power grid projects. Construction, new 22 major power grid projects of 220 kV and above, including Panxi optimization, Yanyuan transformation, Leshan South, Deyang South, etc., will add 13 million kVA of substation capacity, and the total length of the new line is 1,410 kilometers. All month delivery.

It is understood that during the 14th Five-Year Plan period, with the acceleration of the construction of the Chengdu-Chongqing economic circle, the demand for electricity in Sichuan and Chongqing will increase rapidly. An increase of 10.5%, 44.31%. The Sichuan-Chongqing UHV project is an electric power expressway connecting the power sources and load centers in Sichuan and Chongqing. After completion, it can transmit clean electric energy of more than 35 billion kWh every year. It is of great importance for building a clean, low-carbon, safe and efficient energy system and ensuring regional energy security. significance.

In October 2021, the governments of Sichuan and Chongqing issued the "Outline for the Construction of the Chengdu-Chongqing Economic Circle", and in March 2022, they issued the "Sichuan-Chongqing Power Grid Integration Construction Plan", proposing to optimize the allocation of Sichuan-Chongqing power resources and promote The Sichuan-Chongqing power grid has been upgraded to promote interconnection. At present, the backbone of the Sichuan-Chongqing power grid is a 500 kV power grid, which is interconnected with the East China, Central China and Northwest China power grids through a number of UHV and 500 kV transmission channels. After the completion of the Sichuan-Chongqing UHV project, the voltage level of the main grid of China's Southwest Power Grid will be increased from 500 kV to 1,000 kV, which can effectively meet the needs of multiple development and transmission of power sources, and effectively undertake electric energy from Northwest China, Tibet and other places, greatly improving The overall power security capability of the Chengdu-Chongqing Economic Circle lays the foundation for the construction of a stronger and more complete UHV backbone grid in the southwest region.

As we all know, the power grid has the characteristics of large investment scale, long industrial chain, strong driving force, and significant medium and long-term economic benefits. According to investment estimates, the Sichuan-Chongqing UHV AC project will drive nearly 90 billion yuan of investment in equipment manufacturing, power supply construction and other related industries, effectively help smooth the domestic circulation, and effectively serve the construction of a new development pattern. Editor/He Yuting