BSC audit reports


This page details the various reports related to the BSC Audit and includes information on the Audit Issues Report, the Funding Shares Audit and the Scope and approach documents.

Audit Issues Report

Following the audit, individual and confidential Audit Issue documents will be sent to selected organisations (Audited Entities) and will describe breaches of relevant BSC obligations for any non–compliances that may have been identified. The Auditor will also make recommendations in respect of rectification and all material Audit Issues are given an Impact Rating of high, medium or low.

The BSC Audit Report

The BSC Auditor presents the Annual BSC Audit Report to the BSC Panel in June of each year.

The Audit reports are split between the International Standard on Assurance Engagements (ISAE) 3000 Opinion covering CVA MOAs and Central Systems, and the Process Assessment Report covering Suppliers and SVA Agents.

At its May 2020 meeting, the BSC Panel approved a revision to the timescales for completing the ISAE 3000 Opinion for 2019/20. It was finalised remotely and delivered to the Performance Assurance Board (PAB) at its September 2020 meeting, and to the BSC Panel at its October 2020 meeting. This delay allowed Parties to prioritise critical business as usual work as they manage the impact of COVID-19.

Statement of Significant Matters

This report includes the Statement of Significant Matters raised for the period ended 31 March 2018.

The following key issues have been highlighted within the 2017/18 BSC Audit report’s statement of significant matters:

Issues relating to Metering

  • Metering System faults not resolved in a timely manner
  • Incomplete or delayed provision of meter reads and Meter Technical Details
  • Energisation status not confirmed
  • Change of Measurement Class
  • Commissioning

Data quality issues in the Non Half Hourly market

  • NHHDA D0095 exception report
  • NHH standing data flow and meter reading backlogs
  • NHHDA D0023 exception report (previously reported within Other individually insignificant errors)
  • Erroneous values of EACs and AAs
  • Long Term Vacant (LTV) process

Data quality issues in the Half Hourly Market

  • D0235 exception report and D0004 flows backlogs

Market Issues document

The BSC Auditor also produces a Market Issues document that highlights issues experienced by a number of Market Participants. The BSC Auditor’s Summary of Market Issues report is also published below

Elexon works with the industry and PAB to resolve these market issues.

Funding Shares Audit

The Funding Shares Audit forms part of the BSC Audit. Findings from the Funding Shares Audit are published separately.

Scope and approach documents

The BSC Panel sets the scope of the BSC Audit each year. Following this, the BSC Auditor develops an Audit approach, which describes how it will deliver the work required to meet the scope.

The scope of the BSC Audit is set by the Panel for each Audit year and includes the determination of the annual Audit Materiality Threshold. The Materiality Threshold is currently 1.2TWh which represents approximately 0.5% of the total annual electricity supplied across Great Britain in the preceding calendar year.

The BSC Audit incorporates the Funding Shares Audit and takes account of the findings of the Balancing Mechanism (BM) Audit performed by National Grid’s Auditor.

Scope for 2020-2021

Scope for 2019-2020

Scope for 2018-2019

Scope for 2017-2018 (H3)

Scope for 2016-2017 (H3)

Scope for 2015-2016

Scope for 2014-2015


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