RIL and its its partners BP Plc of the UK and Canada's Niko Resources, who had on November 11 slapped an arbitration notice against the government disputing the USD 1.55 billion demand, have named former UK high court judge Bernard Eder to the panel.
"They (RIL-BP-Niko) named the arbitrator last month and the government has nominated Singhvi on the panel now," a senior official said.
The oil ministry had on November 3 issued a notice to RIL, Niko and UK's BP Plc seeking USD 1.47 billion for producing in the seven years ended March 31, 2016 about 338.332 million British thermal unit of gas that had seeped or migrated from the state-owned Oil and Natural Gas Corporation's (ONGC) blocks into their adjoining KG-D6 in the Bay of Bengal.
After deducting USD 71.71 million royalty paid on the gas produced and adding an interest at the rate of Libor plus 2 per cent, totalling USD 149.86 million, a total demand of USD 1.55 billion was made on RIL, BP and Niko.
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The official said the arbitration will get underway once all the three-members are in place.
The government's compensation claim flowed from the report of the Justice (retd) A P Shah Committee.
The Shah panel, in its August 28 report, concluded that there has been "unjust enrichment" to the contractor of the block KG-DWN-98/3 (KG-D6) due to production of the migrated gas from ONGC's blocks KG-DWN-98/2 and Godavari PML.
The government, the official said, accepted the recommendations of the committee and consequently, decided to claim restitution from RIL-BP-Niko for "the unjust benefit received and unfairly retained".
The cost recovery issue is also being arbitrated separately.
Originally, ONGC had sued RIL for producing gas that had migrated from its blocks KG-DWN-98/2 (KG-D5) and Godavari PML in the KG basin to adjoining KG-D6 block of RIL.
Under direction of the Delhi High Court, the government had appointed a one-man committee under retired Justice A P Shah to go into the issue. Shah however said the compensation should go to government as it is the owner of all unproduced natural resources.