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Issue 65

Causes and treatment of large Line Loss Factors

Proposer: ELEXON

Phase: Closed

Recommendation to Raise a Change: Yes


Line Loss Factors (LLFs) are values which are calculated and applied to Metered Volumes, scaling the Metered Volumes to account for distribution losses.  An LLF greater than 1 is typical of importing sites as more energy must be dispatched than required to account for the losses that will occur along the way. Exporting sites are normally assigned an LLF value smaller than 1.

The Supplier Volume Allocation Group (SVG) recently discussed two large SVA LLF values calculated for the forthcoming 2017/18 BSC Year (see SVG191 Headline Report). The SVG noted that the values were calculated correctly in accordance with BSCP128 and that there was therefore no audit non-compliance. The SVG also noted that the values were below the Data Transfer Catalogues (DTC’s) permitted maximum. However, SVG Members expressed concern over whether these values were representative of the losses caused by the site.


A Workgroup was held on Tuesday 7 March 2017 which determined that some change to BSCP128 may be required to define steps that may be taken in calculations for low consumption sites to prevent erroneous Line Loss Factor Values. The second Issue Group was held on 4 May 2017 to consider potential redlined changes to BSCP128 to progress as a Change Proposal. The Issue Final Report was tabled at the BSC Panel meeting on 8 June 2017.


Issue 65 - Final Report  [1.3 Mb] Document Date: 1 June 2017

Issue 65 - BSCP40  [165.4 Kb] Document Date: 13 January 2017