“TANGEDCO imported coal from Indonesia with specification mentioned in the purchase orders as Gross Calorific Value (Air Dried Basis) of 6000 Kcal/ Kg, which is equivalent to Gross Calorific Value (As Received basis) of 5500 Kcal/ Kg. Instead of comparing the rates for 6,000 Kcal/Kg of air dried basis with that of 5,500 Kcal/Kg of as received basis, the payment was made for 6,000 Kcal/kg of as received basis, which resulted in at least a 10$ of over-invoicing per metric ton,” explained Jayaram Venkatesan, Convenor of Arappor Iyakkam.