Workers install a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)

Workers install a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)

A worker installs a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)

A worker installs a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)

A worker installs a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)

Workers install a solar power unit at the construction site of a 300-MW photovoltaic electricity project of the China Datang Corporation Ltd. in Gonghe County, Tibetan Autonomous Prefecture of Hainan in northwest China's Qinghai Province, Dec. 15, 2020. (Xinhua/Zhang Hongxiang)