The government on Wednesday left the price of natural gas produced by companies such as ONGC unchanged at a decade-low rate of USD 1.79 while the same for difficult fields like the one operated by Reliance-BP was cut by 11 per cent. The Oil Ministry’s Petroleum Planning and Analysis Cell (PPAC) announced the bi-annual revision in the price of gas, which is used to generate electricity, make fertiliser and convert into CNG for automobiles and cooking gas for households. The rates paid for gas produced from fields given to Oil and Natural Gas Corporation (ONGC) and Oil India Ltd (OIL) were left unchanged at USD 1.79 per million British thermal unit for the six-month period beginning April 1, PPAC said in a notification.