Construction of the Horgos metering station for Line C of the China-Central Asia gas pipelines has been completed and passed an appraisal by a quality inspection watchdog. The station will be a hub connecting Line C and China's No.3 West-East gas pipeline. The station will be used to conduct metering, inspection and settlement of imported natural gas from central Asian countries. The Line C pipeline starts from the border area between Turkmenistan and Uzbekistan and runs through Kazakhstan before reaching northwest China's Xinjiang with a length of 1,840 kilometers. Contruction of the project undertaken by PetroChina started in 2012. The line has been designed to run parallel with existing Line A and Line B of China-Central China gas pipelines. After the joining of the pipelines and the country's West-to-East natural gas pipelines in Xinjiang, the gas imported from central Asia is sent to east China. Xinjiang produces oil, gas and coal. Neighboring central Asian countries are also rich in natural resources. The West-to-East natural gas pipelines that carry gas from both Central Asia and Xinjiang have transported more than 22 billion cubic meters of natural gas to Shanghai in the past 10 years, according to Shanghai Gas (Group) Co. Ltd..