Formal title: Introduction of Zonal Transmission Losses on a Marginal Basis without Phased Implementation

Current Status

Initial Written Assessment
Assessment Procedure
Report Phase
With Authority


This Modification proposes that transmission losses are allocated on a zonal rather than on a uniform system-wide basis. A Transmission Loss Factor Agent (TFLA) would be appointed to calculate zonal marginal monthly TLFs for each BMU on an ex ante basis. This approach is consistent with a potential P75 Alternative considered by the TLFMG as part of the P75 Assessment Procedure.


The BSC Panel recommended that the Proposed Modification should not be made. The Authority rejected the Proposed Modification on 17 January 2003.


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