Elexon explains the Non Half Hourly Data Aggregation (NHHDA) Check Data Collection Data (CDCD) function and guidance on managing and resolving exceptions.

<div data-id="1-1.1" style="text-align:left">1.1 Purpose</div>

<div data-id="1-1.2" style="text-align:left">1.2 Scope</div>

<div data-id="1-1.3" style="text-align:left">1.3 Summary</div>

<div data-id="1" style="text-align:left">1. Introduction</div>

<div data-id="2-2.1" style="text-align:left">2.1 Context</div>

<div data-id="2-2.2" style="text-align:left">2.2 Business Case</div>

<div data-id="2-2.3" style="text-align:left">2.3 Obligations</div>

<div data-id="2-2.4" style="text-align:left">2.4 Exception Types</div>

<div data-id="2-2.5" style="text-align:left">2.5 Example of <u class='defined-term'>Consumption Data</u> Irregularities</div>

<div data-id="2-2.6" style="text-align:left">2.6 Example of Inconsistent <u class='defined-term'>Metering System</u> Attributes</div>

<div data-id="2-2.7" style="text-align:left">2.7 Material Exceptions</div>

<div data-id="2-2.8" style="text-align:left">2.8 Material and Immaterial Exceptions</div>

<div data-id="2-2.9" style="text-align:left">2.9 Prioritisation</div>

<div data-id="2-2.10" style="text-align:left">2.10 Related Exception Types</div>

<div data-id="3-3.1" style="text-align:left">3.1 Process Overview</div>

<div data-id="3-3.2" style="text-align:left">3.2 Report Management</div>

<div data-id="3-3.3" style="text-align:left">3.3 Assessment / Logging</div>

<div data-id="3-3.4" style="text-align:left">3.4 Analysis of Material Exceptions</div>

<div data-id="3-3.5" style="text-align:left">3.5 Corrective Action</div>

<div data-id="3-3.6" style="text-align:left">3.6 Root Cause Analysis</div>

<div data-id="3-3.7" style="text-align:left">3.7 Management Information</div>

<div data-id="3-3.8" style="text-align:left">3.8 Complementary Processes</div>

<div data-id="3-3.9" style="text-align:left">3.9 <u class='defined-term'>Supplier</u> and Agent Roles</div>

<div data-id="3" style="text-align:left">3. Management of Exceptions</div>

<div data-id="4-4.1" style="text-align:left">4.1 Potential Causes</div>

<div data-id="4" style="text-align:left">4. Causes of Exceptions</div>

<div data-id="5-5.1" style="text-align:left">5.1 ‘Inherited’ <u class='defined-term'>SMRS</u> Exceptions</div>

<div data-id="5-5.2" style="text-align:left">5.2 ‘Inherited’ NHHDC Exceptions</div>

<div data-id="5-5.3" style="text-align:left">5.3 Retrospective Corrections to <u class='defined-term'>SMRS</u></div>

<div data-id="5-5.4" style="text-align:left">5.4 Constraints in Data Collection (and <u class='defined-term'>Meter</u> Operator) <u class='defined-term'>System</u>s</div>

<div data-id="5-5.5" style="text-align:left">5.5 Failed Instructions (D0023)</div>

<div data-id="5-5.6" style="text-align:left">5.6 Corrections Post-Final Reconciliation</div>

<div data-id="5" style="text-align:left">5. Exception Resolution</div>

<div data-id="appendix-a--architectural-summary" style="text-align:left">APPENDIX A – ARCHITECTURAL SUMMARY</div>

<div data-id="appendix-b--best-practice-reporting-timetable" style="text-align:left">APPENDIX B – BEST PRACTICE REPORTING TIMETABLE</div>

<div data-id="further-information" style="text-align:left">Further Information</div>

CONTENTS

D0095 User Guide Volume 1 V5.0

Defined Terms

Cross-references