Workers conduct an inspection of power transmission lines at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023. (Xinhua/Zhang Hongxiang)

GOLMUD, June 5 (Xinhua) -- Since 2012, the State Grid's Qinghai Electricity Power Company would conduct its annual centralized maintenance of the Qinghai-Tibet grid interconnection project, whose grid lines are laid at the plateau with an average altitude of 4,500 meters. Low temperatures, lack of oxygen and strong winds on the plateau challenge the operation and maintenance of the grid.

Over 420 workers will finish this year's maintenance work of 608-kilometer-long power transmission lines as well as the Qaidam Converter Station in 15 days.

Over 10.5 billion kWh of electricity has been transferred to Tibet through the Qinghai-Tibet grid interconnection project, which was put into operation in 2011.

This aerial photo taken on June 4, 2023 shows kiangs (Equus kiang) passing by a power transmission tower at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Workers conduct an inspection of power transmission lines at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023. (Photo by Pan Binbin/Xinhua)

A worker conducts an inspection of power transmission lines at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023.(Xinhua/Zhang Hongxiang)

Workers conduct power grid maintenance at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023. (Xinhua/Zhang Hongxiang)

Workers conduct power grid maintenance at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023.(Xinhua/Zhang Hongxiang)

This photo taken on June 2, 2023 shows a power transmission tower in Hoh Xil of northwest China's Qinghai Province.(Xinhua/Zhang Hongxiang)

Workers conduct an inspection of power transmission lines at Tanggulashan Township of Golmud City in the Mongolian-Tibetan Autonomous Prefecture of Haixi, northwest China's Qinghai Province, June 3, 2023. (Photo by Pan Binbin/Xinhua)