It is reported that the capacity of the first two lines of the pipeline amounted to 30 billion cubic meters of gas at the end of 2010. The construction of the third line with capacity of 25 billion cubic meters of gas per year was completed at the end of 2014.
As of 2015, the capacity of the pipeline from Turkmenistan to China is 55 billion cubic meters per year.
In September 2013, the leaders of Turkmenistan and China signed an agreement to build a fourth line of the gas pipeline with capacity of 25 billion cubic meters of gas per year. This branch will pass from Turkmenistan through Uzbekistan, Tajikistan, and Kyrgyzstan to China. Construction of the pipeline is scheduled for completion in 2017.
China has the ability to buy gas from other Central Asian countries as well on this main gas pipeline.
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