An aerial drone photo shows the construction site of Tongliang UHV substation in Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

The Sichuan-Chongqing 1,000kV ultra-high voltage (UHV) alternative current (AC) project will include four UHV substations in southwest China's Chongqing Municipality and the neighboring Sichuan Province. Upon completion, about 35 billion kWh of electric energy will be transmitted per year. 

Technicians prepare for tower work at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

A drone photo taken on March 17, 2024 shows technicians working at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing. (Xinhua/Huang Wei)

Technicians climb a transmission tower for work at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

Technicians work at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

An aerial drone photo shows the construction site of Tongliang UHV substation in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

A drone photo taken on March 17, 2024 shows technicians working at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing. (Xinhua/Huang Wei)

A worker installs insulators at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)

Workers install insulators at the construction site of the Sichuan-Chongqing 1,000kV UHV AC project in Shaoyun Town of Tongliang District, southwest China's Chongqing, March 17, 2024. (Xinhua/Huang Wei)