The Reserve Bank of India will make payments of USD 6.5 billion in past oil dues to Iran "in a calibrated manner so that there is no pressure on exchange rate", a senior finance ministry official said today.
The first tranche will go out "sometime this month," he said.
Another official said the first tranche of USD 700 million will go out in "next few days".
"Modalities are being worked out and it will be paid in next few days," he said.
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No modalities of the second instalment of USD 700 million have yet been worked out, the official said.
The remaining USD 4 billion would be cleared in tranches after payment channels are cleared.
The payments are being made after the July nuclear deal that Tehran has struck with western powers, allowing for suspension and eventual termination of sanctions.
Sanctions will be lifted after the International Atomic Energy Agency verifies that Iran has implemented its commitments to cease nuclear programme. Until then, the interim sanctions relief format of November 2013 would continue.
About 45 per cent of the oil import bill is paid in rupees in a UCO Bank branch and the rest has accumulated.
The official said refiners will deposit USD 700 million with RBI which will transmit the money to Iran.
Since February 2013, refiners like Mangalore Refinery and Petrochemicals (MRPL) and Essar Oil have been paying 45 per cent of dues on purchase of crude oil from Iran in rupees through UCO Bank, Kolkata.
The remaining has been accumulating, pending finalisation of a payment route and mechanism. They had last year paid nearly USD 3 billion in six instalments through a limited payment channel following start of nuclear talks between the Western world and Iran.
Essar Oil owes USD 3.34 billion, MRPL (USD 2.49 billion) and Indian Oil Corp (USD 581 million) to Iran. HPCL-Mittal Energy Ltd (HMEL) owes USD 97 million and Hindustan Petroleum Corp Ltd (HPCL) another USD 29 million.
Besides, about Rs 17,000 crore was lying in Iranian account with UCO Bank.