"The operations of the plant has been temporarily shut down from June 14, 2016," it said in a regulatory filing today.
There would not be any financial impact due to the temporary closure, it added.
The company is in the business of manufacturing and marketing calcined petroleum coke. The calcination plant has a capacity of 75,000 tonnes per annum (TPA) and is located in southern Goa, close to the Mormugao port.
The Goa plant has the largest mechanical sieving and screening facilities for petcoke in India. The firm also has two other plants -- at Bilaspur in Chhattisgarh and Paradeep in Orissa.