Energy management principles:
[...] the Central Government on and from 01st January, 2012 hereby prescribes:- (i) switch over from existing Usetul Heat Value (UHV) based system of grading and pricing of non-cooking coals produced in the country to fully variable Gross Calorific Value (GCV) based system. (ii) the classes in to which Coal and Coke shall be categorized as prescribed in the Table below:- [...]