Section 46 in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2019
46. Computation and Payment of Transmission Charge for Inter-State Transmission System and Communication System.
(1)The fixed cost of the transmission system or communication system forming part of transmission system shall be computed on annual basis, in accordance with norms contained in these regulations, aggregated as appropriate, and recovered on monthly basis as transmission charge from the users, who shall share these charges in the manner specified in clause (2) of this Regulation.(2)The Transmission charge (inclusive of incentive) payable for a calendar month for transmission system or part shall be computed for each region separately for AC and DC system as under:For AC system:a) For TAFM n 98.00%AFC x (NDMn/NDY) x (TAFMn/98.00%)b) For TAFMn: 98.00% TAFMn 98.50%AFC x (NDMn/NDY) x (1)c) For TAFMn: 98.50% TAFMn 99.75%AFC x (NDMn/NDY) x (TAFM/98.50%)d) For TAFMn 99.75%AFC x (NDMn/NDY) x (99.75%/98.50%)Where,AFC = Annual Fixed Cost specified for the year in RupeesNDMn = Number of days in nth monthNDY = Number of days in the yearTAFMn = Transmission System availability factor for the nth month, in percent computed in accordance with Appendix II.For HVDC bi-pole links and HVDC back-to-back Stations:TC1 = AFC x (NDM1 / NDY) x (TAFM1/NATAF)TC2 = AFC x (NDM2 / NDY) x (TAFM2/NATAF) - TC1TC3 = AFC x (NDM3 / NDY) x (TAFM3/NATAF) - (TC1+TC2)TC4 = AFC x (NDM4 / NDY) x (TAFM4/NATAF) - (TC1+TC2+TC3)....TC11 = AFC x (NDM11/NDY) x (TAFM11/NATAF) - (TC1+TC2+....+TC10)TC12 = AFC x (TAFY/NATAF) - (TC1+TC2+....+TC11);If,(i)TAFM: 95.00% TAFM 97.50%, then TAFM=NATAF;(ii)TAFM: 97.50% TAFM 99.75%, then NATAF=97.50%; and(iii)For TAFM 99.75%, then TAFM=99.75% and NATAF= 97.50%.Where,TCn = Transmission charges inclusive of incentive up to the nth monthAFC = Annual fixed cost specified for the year in rupeesNATAF = Normative Annual Transmission Availability Factor in percentageNDMn = No of days upto the end of nth month of the financial yearNDY = No. of days in the yearTAFMn = Transmission availability factor upto the end of the nth month of the year in percentage computed in accordance with Appendix -IITAFY = Transmission availability factor in percent for the year.(3)The transmission charges shall be calculated separately for part of the transmission system having different NATAF and aggregated thereafter, according to their sharing by the long term customers. The charges of the communication system shall be a part of the transmission charges and shall be shared by the long term customers.
