Recently, an approval document from the National Development and Reform Commission was transmitted from Beijing to the land of Sichuan and Chongqing. The Sichuan Chongqing ultra-high voltage AC strengthening project with a total investment of 15.46 billion yuan has been officially approved, and two brand new 1000 kV substations are about to be built in Mianyang and Changshou. As the electricity load in the southwest region continues to rise year after year and the Xinjiang electricity to Chongqing direct current project accelerates, this electric highway spanning Sichuan and Chongqing has finally obtained the construction permit.

Newly added substation capacity of 12 million kVA

The project will build a new 1000 kV substation in Mianyang, Sichuan, a new 1000 kV substation in Fuling, Chongqing, and expand the Tongliang 1000 kV substation, adding a total of 12 million kVA of new substation capacity. The total length of the newly-built 1000 kV double circuit line from Chuanbei to Fuling to Tongliang is about 2 by 490 kilometers, and the line from Aba to Chengdu East π to Chuanbei Ultra High Voltage Station is about 2 by 6.6 kilometers. State Grid Chongqing Electric Power has confirmed that it will promote the construction of the Chongqing Guizhou back-to-back interconnection project this year, ensuring that the project starts within the year.

Comprehensive upgrade of Sichuan Chongqing power mutual assistance capability

This project is one of the 12 national planning projects for flexible mutual aid of electricity. After completion, it will significantly enhance the power mutual aid, surplus and shortage complementarity, and emergency support capabilities between Sichuan and Chongqing. The project is also an important component of the Sichuan Chongqing ultra-high voltage AC backbone network, which can support the connection and power consumption of Xinjiang power to the Sichuan Chongqing DC receiving end converter station. In recent years, the electricity gap in Sichuan Province has been widening year by year, and the peak shaving pressure of Chongqing load center continues to increase. This ultra-high voltage channel will effectively alleviate the regional power supply and demand contradiction. Keywords: Infrastructure Engineering News Network, Ultra High Voltage

Serve the construction of a unified national electricity market

The approval of the Sichuan Chongqing Ultra High Voltage AC Strengthening Project marks a crucial step for the Southwest Ultra High Voltage Network to move from single line interconnection to ring network mutual assistance. After the project is put into operation, the power exchange channel between the clean energy in western Sichuan and the load center in eastern Sichuan will be completely opened up, providing consumption space for large-scale transmission of hydropower, wind power, and photovoltaics in Sichuan, while enhancing the access capacity of Sichuan and Chongqing to northwest coal-fired power and new energy. Against the backdrop of accelerating the construction of a unified national electricity market, this ultra-high voltage corridor spanning the land of Bashu is becoming a key puzzle for the interconnection of the Southwest regional power grid.Editor/Gao Xue