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The Board of Directors of CPCL had in April this year recommended setting up a new 9 million tonnes a year refinery at an estimated cost of Rs 27,460 crore (with an accuracy of plus-30 per cent).
The expansion was subject to the approval of board of IOC, the holding company of CPCL.
"The Board of Directors of IOC at the meeting held on September 22 accorded In-principle approval for setting up a new 9 million tonnes per annum refinery at Cauvery Basin, Nagapattinam at an estimated cost of Rs 27,460 crore and for carrying out pre-project activities," IOC said in a regulatory filing.
The final approval of the project would be obtained after preparation of Detailed Feasibility Report of the project.
It also has a smaller 1 million tonnes Nagapattinam refinery.
CPCL, formerly known as Madras Refineries Ltd, was formed as a joint venture in 1965 between the Government of India, AMOCO and National Iranian Oil Co (NIOC) having a shareholding in the ratio of 74 per cent, 13 per cent, 13 per ent respectively.
In 1985, AMOCO disinvested. After this, government held 84.62 per cent and NIOC 15.38 per cent.
The government later disinvested 16.92 per cent of the paid. The company was listed in 1994. IOC acquired government stake in 2000-01. IOC currently holds 51.89 per cent stake in CPCL while NIOC holds 15.40 per cent.