Reliance, with a 4.58 per cent gain, and Oil & Natural Gas Corporation, along with financial and IT stocks lifted the Sensex, helping it to close above the 21,000 level.
Oil & gas and realty stocks climbed the most among the 12 BSE sectoral indices. The consumer durables sector index fell.
The S&P BSE Sensex opened higher than yesterday's close and traded steady for the first two hours. It then shot up and touched the day's high of 21,117.99 before closing at 21,079.72, up 371.10 points or 1.79 per cent.
The Cabinet yesterday allowed Reliance to increase gas prices from April even as output at its main Dhirubhai 1 and 3 fields in the KG-D6 block has dropped. The price hike was allowed provided the company furnishes bank guarantees to cover its liability if gas-hoarding charges are proved.
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Oil Minister M Veerappa Moily today said higher gas prices would encourage exploration, helping to raise domestic production and cut dependence on imports.
Foreign institutional investors bought shares worth a net Rs 2,264.11 crore yesterday, according to provisional data with the stock exchanges.