Transmission Loss Factor (TLF) Determination

Section T, Annex T-2 of the BSC requires BSCCo to publish on the BSC Website, on or before 31 December each year, all input and output data from the determination of Transmission Loss Factors (TLFs) for use in the next BSC Year. These data files are published on the TLFs Determination page of the ELEXON Portal. This guidance note describes the source of each data file, how each input data file is used in the determination of TLFs, and the purpose of each output file.