New Delhi, Sep 9 - Anil Ambani group firm Reliance Natural Resources Ltd (RNRL) Wednesday told the Supreme Court that Reliance Industries Ltd (RIL), belonging to elder brother Mukesh Ambani, was under a binding obligation to supply gas to it.

In an affidavit filed in the apex court registry, RNRL also contended that the government had no role to play either in the utilisation or the fixing of gas price as per its contract with RIL.

'It is submitted that the RIL has made valid, binding and enforceable commitment in the year 2005 to supply gas on the agreed terms to RNRL,' the company said in its reply to the RIL lawsuit challenging the Bombay High Court ruling on gas supply row between the energy firms of the Ambani brothers.

'RIL has complete marketing freedom for sale of gas within India,' the RNRL reply said, contending that the government has no role to play either in the utilization or the fixation of gas price as per its contract with RIL.

'The marketing freedom would include within its scope the freedom to sell the gas on such terms and at such price that RIL deems fit and proper.'

RNRL said government approval is required for valuation and not sale price.

It also said it has not questioned the government's ownership of the gas.