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P350 Implementation: Introduction of a seasonal Zonal Transmission Losses scheme

Introduction

Modification: P350

The Competition and Markets Authority (CMA) Energy Market Investigation concluded that the absence of locational pricing for transmission losses has an adverse effect on competition. Therefore, in line with the CMA’s determination, P350 will introduce a Transmission Loss Factor for each TLF Zone (which will align with the existing Grid Supply Point (GSP) Groups) for each BSC Season in order to allocate transmission losses on a geographical basis. The CMA is mandating, through secondary legislation and licence changes, an Implementation Date of 1 April 2018.

Industry review of Load Periods (LPs) and Sample Settlement Periods (SSPs) Methodology for P350

The consultation for the proposed methodology for Load Periods (LPs) and Sample Settlement Periods (SSPs) for P350 closed at 17:00 on Wednesday 31 May 2017. Please see the P350 Implementation Circular #2 for full details. ELEXON are currently responding to comments returned and will present the updated methodology to the BSC Panel on Thursday 13 Jul7 2017.

Past key dates

  • 11 May 2017 – Draft LPs and SSPs Methodology presented to Panel
  • 15 May 2017 – Industry review of LPs and SSPs Methodology for P350 starts
  • 31 May 2017 – Industry review of LPs and SSPs Methodology for P350 ends

Future key dates

  • 12 Jul 2017 – Updated LPs and SSPs Methodology presented to Panel for approval
  • 25 Jul 2017 – Chosen  LPs and SSPs presented to Panel / ISG for approval
  • 10 Aug 2017 – Chosen  LPs and SSPs presented to Panel for information
  • 31 Aug 2017 – Chosen LPs and SSPs published to the BSC Portal
Document Name Version Number
Load Period and Sample Settlement Period Consultation 0.1

Review of new and amended Configurable Items for Approved Modification P350

The consultation for the new and amended Code Subsidiary Documents (CSDs) and Configurable Items (CIs) for P350 closed at 17:00 on Friday 21 April 2017. The documents consulted on can be found in the tables below. Please see the P350 Implementation Circular #1 for full details.

Past key dates

  • 04 Apr 2017 – Industry review of new CSDs and amended CIs for P350 starts
  • 21 Apr 2017 – Industry review of new CSDs and amended CIs for P350 ends
  • 11 May 2017 – New CSDs for P350 presented to Panel for approval
  • 12 May 2017 – Proposed effective date for new CSDs
  • 23 May 2017 – CIs amended for P350 presented to ISG for approval
  • 30 May 2017 – CIs amended for P350 presented to SVG for approval
  • 01 Jun 2017 – CIs amended for P350 presented to TDC for approval

Future key dates

  • 29 Jun 2017 – Proposed effective date for CIs amended for P350

Code Subsidiary Documents (CSDs) and Configurable Items (CIs) for P350

The documents below were approved by the BSC Panel on Thursday, 11 May 2017.

Document Name Version Number Approving Committee Effective Date
TLFA Service Description 1.0 Panel 12 May 2017
Load Flow Model Specification 2.0 Panel 12 May 2017

The documents below were approved by the Imbalance Settlement Group (ISG) on Tuesday, 23 May 2017, and the Supplier Volume Allocation Group (SVG) on Thursday, 11 May 2017.

Document Name Version Number Approving Committees Effective Date
BSCP01 Overview of Trading Arrangements 15.3 ISG and SVG 29 June 201
BSCP15 BM Unit Registration 24.3 ISG and SVG 29 June 2017
Reporting Catalogue 18.3 ISG and SVG 29 June 2017

The documents below were approved by the Imbalance Settlement Group (ISG) on Tuesday, 23 May 2017.

Document Name Version Number Approving Committee Effective Date
BSCP25 Registration of Transmission System Boundary Points, Grid Supply Points, GSP Groups and Distribution Systems Connection Points 7.3 ISG 29 June 2017
CDCA Service Description 20.2 ISG 29 June 2017
CDCA User Requirement Specification 17.3 ISG 29 June 2017
CRA Service Description 18.3 ISG 29 June 2017
CRA User Requirement Specification 18.3 ISG 29 June 2017
SAA Service Description 25.3 ISG 29 June 2017
SAA User Requirement Specification* 20.3 ISG 29 June 2017
NETA IDD Part 2 word document* 35.3 ISG 29 June 2017
NETA IDD Part 2 spreadsheet (extract)* 26.4 ISG 29 June 2017

The documents below were approved by the Trading Disputes Committee (TDC) on Thursday, 01 Jun 2017.

Document Name Version Number Approving Committee Effective Date
BSCP11 Trading Disputes 15.2 TDC 29 June 2017

*These documents are also impacted by changes in the June 2017 Release, which will be issued for industry review as part of a separate June 2017 Release Circular.

Past updates

National Grid raised P350 ‘Introduction of a seasonal Zonal Transmission Losses scheme’ on 4 July 2016. The Draft Modification Report for P350 was presented to the Panel on 9 February 2017, who unanimously recommended that P350 be approved. On 24 March 2017, Ofgem approved P350 for implementation on 1 April 2018.