What this document covers
What this document does not cover
Who should use this Guidance Note?
What is a TAA Desktop Audit?
- Market Wide Half Hourly Settlement (MHHS)
Supplier or Registrant Confirmation of a TAA Desktop Audit
Information required from audit participants before a TAA Desktop Audit
- Single Line Diagram
- D0268 Data Flow (SVA) or BSCP20/4.3 (CVA)
- D0215 Data Flow (SVA only)
- HH Consumption Data
- Commissioning Certificates
- Overall Accuracy
- Aggregation Rule (CVA only)
What must I do once the TAA have completed a Desktop Audit?
- TAA Inspection Visits following a Desktop Audit
Do you need more information?
Appendix 1: Category A non-Compliances
Appendix 2: Category B non-Compliances
Appendix 3: Using the National Measurement Transformer Error Statement (NMTES)

Performance Assurance: TAA Desktop Audit Local Working Instruction V3.0

Effective From Date:21/05/2025

Status:LIVE

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