This line, stretching 6,500km from Xinjiang Uygur Autonomous Region to Guangdong Province, will be able to deliver 30m cum/yr of gas from Central Asia, or nearly half of the national consumption in 2007. The total length increases to 9,102km when the projects eight subsidiary pipelines are taken into account; as well as these, the overall project includes the 1,794-km pipeline through Turkmenistan, Uzbekistan, and Kazakhstan to the boarder in Xinjiang. Turkmenistan has agreed to supply gas to China for 30 years. PetroChina is also considering building China's third west-east gas pipeline.