ISG143/05 Line Loss Factors for a Distribution System ... - Elexon

ISG143/05
Line Loss Factors for a Distribution
System Connection Point – Metering
System ID 7185
Meeting Name
Imbalance Settlement Group
Meeting Date 26 March 2013
Purpose of paper
Summary
For Decision
Following a change to the Aggregation Rules for Metering System ID 7185 to include a Line
Loss Factor, this paper seeks the ISG’s approval of Site Specific Central Volume Allocation
Line Loss Factors calculated by UK Power Networks (LOND) Licensed Distribution System
Operator to apply for the BSC Year 01 April 2013 to 31 March 2014.
1. Introduction
1.1 The Trading Disputes Committee (TDC) requested that ELEXON re-validate the Aggregation Rules for all
Central Volume Allocation (CVA) BM Units against up-to-date single line electrical diagrams which identify
the Boundary Points, Meter locations and the electrical configurations at all CVA sites.
1.2 Through re-validation we identified that Wembley (II_WEMBLEY) is a Distribution System Connection
Point connected at 11kV and the Balancing and Settlement Code (BSC) Section R3.3.2 requires that
‘Where any Aggregation Rules relate to any Metering System which is connected to a Distribution
System, the Aggregation Rules shall specify, or enable the CDCA to determine, which Line Loss Factor(s)
are to be applied, and how they are to be applied, to metered data in determining Metered Volumes.’
The original Aggregation Rule for Wembley had no Line Loss Factor (LLF) applied.
1.3 A change to the Aggregation Rule has been made to include a LLF and the Licensed Distribution System
Operator (LDSO) has submitted a Site Specific LLF to ELEXON. ELEXON has audited the Site Specific LLF
submission for Metering System ID (MSID) 7185 (Wembley - Gibbons Road Main Substation) in
accordance with BSCP128 1 for the 2013-2014 BSC Year.
2. BSCP128 Audit
2.1 UK Power Networks (LOND) has submitted the Long Format (CVA LLF) files for audit and approval. An
audit has been performed in accordance with BSCP128. ELEXON has validated the LLF file to ensure that
the structure of the file and the LLF values submitted comply with the audit scope of Section 3.5 of
1 ‘Production, Submission, Audit and Approval of Line Loss Factors’
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BSCP128. The submitted LLF file has passed validation. ELEXON invites the ISG to note the audit was
completed successfully and invites the ISG to approve the LLF for use in Settlement.
2.2 The summary report for the LLF submissions is available on the ELEXON Portal.
2.3 Once approved by the ISG, ELEXON will send the LLF files to the CDCA for use in Settlement from 01
April 2013.
2.4 UKPN has also submitted Generic LLFs for Enfield Centre (MSID: 7074 in EELC) and Taylors Lane (MSID:
5538 in LOND) which also involved changes to the Aggregation Rules. These Generic LLFs have already
been approved by the ISG (ISG Paper 142/01).
2.5 All three Aggregation Rule changes will be investigated to see whether a Trading Dispute should be
raised.
3. Recommendations
3.1 ELEXON invites you to:
a) NOTE that the audit processes carried out by ELEXON have been completed successfully;
b) APPROVE the proposed LLF for MSID 7185 for use in Settlement for the BSC Year 01 April 2013
to 31 March 2014.
For more information, please contact:
Oliver Xing, Market Analyst
oliver.xing@elexon.co.uk
020 7380 4276
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