ONGC : Board has accorded its approval for extension/revalidation of Letter of Comfort (LOC) to prospective banks/ investors for amount upto ₹5,400 crore to be raised by OPaL within 12 months from the date of approval of shareholders ONGC : Board has accorded its approval for extension/revalidation of Letter of Comfort (LOC) to prospective banks/ investors for amount upto ₹5,400 crore to be raised by OPaL within 12 months from the date of approval of shareholders