Bs Reporter / Mumbai August 01, 2008, 0:50 IST

Mukesh Ambani-promoted Reliance Industries (RIL) will lose around $1 billion (Rs 4,300 crore) a year if it sells gas to the Anil Ambani's Reliance Natural Resources (RNRL) at the agreed price of $2.34 per million British thermal unit (mBtu).