It reported net profit of Rs 6,435.70 crore, or Rs 26.51 per share, for April-June quarter of the current fiscal, compared with Rs 2,522.94 crore, or Rs 10.39 a share, in the year-ago period.
"Variation in profit is majorly due to higher refinery and petrochemical margins," IOC Chairman B Ashok told reporters here. It earned USD 10.77 on turning every barrel of crude oil into fuel in the first quarter of 2015-16, compared with a gross refining margin (GRM) of USD 2.25 per barrel.
Refinery throughput was 5.5 per cent higher at 13.568 million tonnes.
"Our refinery margin in the quarter was Rs 6,521 crore as compared to Rs 705 crore in the corresponding period of last financial year. Petochem margin rose to Rs 1,875 crore from Rs 719 crore," he said.
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GRM was higher because of inventory gain of USD 4.78 per barrel, he said.
Ashok said GRM were high because of inventory gain as well as better operational performance.
There was a total of Rs 3,218 crore of inventory gain, resulting from valuation of oil rising between the time it is bought, processed and sold.
He said IOC got most of the revenue loss on sale of public distribution system kerosene and subsidised cooking gas compensated by the government (Rs 1,732.95 crore) and upstream oil firms such as Oil and Natural gas Corp Ltd (ONGC) (Rs 878.84 crore).
Company's borrowings have come down to Rs 52,519 crore as on June 30 from Rs 55,247 crore as on March 31, he said.
Other income during the June quarter plunged 80 per cent to Rs 362.4 crore while tax expenses shot up 169 per cent to Rs 2,764.2 crore compared to same quarter last year. Finance cost also slipped 35.2 per cent to Rs 592.2 crore from Rs 913.9 crore.