As its name suggests, PetroChina Company Ltd is the listed arm of state-owned China National Petroleum Corporation (CNPC). It is China's biggest oil producer, and is listed in Hong Kong, New York, and Shanghai.

Sichuan province is increasing gas prices by up to 20 per cent and Zhejiang is seeking approval for a 25 per cent rise. Photo: AP

Mainland gas needs price rise, analysts say

The biggest event in the mainland's natural gas sector this year is expected to be a long-awaited nationwide price increase and further reforms of an antiquated pricing system.