The proposed 12-million-tonne-per-annum plant near Paradip port town in Jagatsinghpur district, about 100 km from state capital Bhubaneswar, was given a five-year environment clearance in July 2007.
The revalidation of the clearance was necessary for the company to proceed on the project, the official told IANS.
The revalidation was granted on the condition that the company will spend five percent of its investment on "enterprise social commitments", he said.
The decision comes days ahead of South Korean President Park Geun-hye's four-day visit to India beginning Jan 15.
The state government signed an agreement with Posco in 2005 for the project, the largest foreign direct investment in India.
The government has already acquired 2,700 acres of land required for the first phase of the project (eight million tonnes per annum).
--IANS (Posted on 10-01-2014)