A worker operates a compressor at a station of a coal seam gas company in north China's Shanxi Province, Dec. 8, 2020. In recent years, Shanxi has promoted the development and application of coal seam gas, which can be "killer" in coal mines and is also effective clean energy after appropriate utilization. (Xinhua/Cao Yang)

Aerial photo taken on Dec. 8, 2020 shows a station of a coal seam gas company in Qinshui County, north China's Shanxi Province.

A worker operates equipment at a well drilling site of a coal seam gas company in north China's Shanxi Province, Dec. 7, 2020.

Workers maintain equipment at a site of a coal seam gas company in Hetou Village, Qinshui County of north China's Shanxi Province, Dec. 8, 2020. 

A worker fuels a car with coal seam gas at a gas station in Jincheng City, north China's Shanxi Province, Dec. 9, 2020. 

Aerial photo taken on Dec. 7, 2020 shows a site of a coal seam gas company in Nanyangpo Village, Shouyang County, north China's Shanxi Province. 

Aerial photo taken on Dec. 7, 2020 shows a well drilling site of a coal seam gas company in north China's Shanxi Province.

Aerial photo taken on Dec. 8, 2020 shows coal seam gas storage cabinets in Qinshui County, north China's Shanxi Province. 

Photo taken on Dec. 7, 2020 shows a well drilling site of a coal seam gas company in north China's Shanxi Province. 

Photo taken on Dec. 7, 2020 shows a worker managing on a site of a coal seam gas company in Nanyangpo Village, Shouyang County, north China's Shanxi Province. 

Workers of a coal seam gas company collect data in Hetou Village, Qinshui County of north China's Shanxi Province, Dec. 8, 2020.

A worker is seen at a coal seam gas workshop in Jincheng City, north China's Shanxi Province, Dec. 9, 2020.