Profit was Rs 434 crore in the same period a year earlier, the company said in a statement.
Revenue from operations increased 15 per cent to Rs 7,273 crore in the third quarter of this financial year from Rs 6,872 crore reported a year ago.
Operating profit of the leading aluminium and copper producer rose 8 per cent to Rs 629 crore as against Rs 582 crore in the same period a year ago.
"Business environment will continue to be tough with added uncertainty on coal block (which is under scrutiny)," he said.
The firm's bottom line will come under strain in the coming quarters on higher depreciation and interest, he said.
During the quarter, while tax outgo increased 23 per cent to Rs 135 crore, finance costs stood at Rs 165 crore in the October-December period.
"Our average interest rate has reduced by 1-1.5 per cent annually after the refinancing of project debt," Chief Financial Officer Praveen Maheshwari said.
By the end of third quarter, net debt was about Rs 14,000 crore, he added.
The aluminium business contributed Rs 2,471 crore in revenue in the third quarter, up from Rs 2,343 crore reported in the previous quarter.
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