Indian Oil Corporation has firmed up plans to pump in over Rs 2,600 crore in setting up several greenfield units and expanding its facilities across the northeast over the next few years, a senior company official said.The board of IOC has already approved various new projects, while some are in the process of getting the nod, with the leading energy firm in talks with the local governments in Meghalaya, Mizoram and Manipur to finalise land parcels for the greenfield units.