Indraprastha Gas Limited (IGL) has increased the compressed natural gas (CNG) prices in Delhi and adjoining cities by 50 paisa per kg, leaving piped natural gas (PNG) prices unchanged since higher use of imported gas for meeting rising demand led to an increase in operational costs. In Delhi, CNG will cost Rs 57.51 per kg, while in Noida, Greater Noida, and Ghaziabad, the cost will be Rs 59.58 per kg because of higher state tax. Further, IGL had to raise the share of imported gas in sales due to inadequate domestic gas allocation for rising demand.