PetroChina will start work on two more underground gas storage facilities by the end of 2018.
Local media reports that the facilities will be located in southwest China's Chongqing Municipality, with a total cost of 5.3 million yuan.
The Tongluoxia and Huangcaoxia facilities are due to be complete by 2022 and will ensure an annual supply of 1.28 billion m3 of gas.
Currently, 25 underground gas facilities exist in China.
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