Section 46(2) in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2019
(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.
