New Delhi, Jan. 1: Indian Oil Corporation today said it would begin the process of commissioning its long delayed Rs 34,500-crore Paradip refinery in Odisha from the first quarter of 2015. "Once fully operational, this 15-million-tonnes a year flagship refinery will further strengthen IOC's position as India's premier refiner and also add substantially to our bottomline," director Sanjiv Singh said in a statement.