Three gas fields in the South China Sea have started operations, China National Offshore Oil Corporation (CNOOC), the owner of the resources, announced on Monday.

The fields off the coasts of Guangdong Province and Hainan Province have a total of 13 wells, with two of them currently producing 21 million cubic feet of natural gas every day.

Production at the three fields is expected to reach a peak daily capacity of 150 million cubic feet in 2015.