The objective of this document is to provide a complete specification of the requirements that the BMRA service must meet, from the users’ point of view. For this purpose, the “users” include Ofgem, the National Electricity Transmission System Operator (NETSO) as the balancing mechanism operator, BSCCo Ltd (as the client), other Service Providers, BSC Parties, and the BMRA Service Provider’s own operators.

25.0

<div data-id="1-1.1" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">1.1 Purpose</div>

<div data-id="1-1.2" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">1.2 References</div>

<div data-id="1" style="margin-left: 1em">1 Introduction</div>

<div data-id="2" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">2 Management Summary</div>

<div data-id="3" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">3 Scope of Specification</div>

<div data-id="4-4.1" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">4.1 Summary of Business Requirements</div>

<div data-id="4-4.2" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">4.2 Service Context</div>

<div data-id="4-4.3" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">4.3 Numbering Scheme for Requirement Definitions</div>

<div data-id="4-4.4" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">4.4 Attributes of Individual Requirements</div>

<div data-id="4" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">4 Business and <u class='defined-term'>System</u> Overview</div>

<div data-id="5-5.1" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.1 <u class='defined-term'>BMRA</u>-F001: Calculate Balancing Mechanism and <u class='defined-term'>Replacement Reserve</u> Volumes</div>

<div data-id="5-5.2" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.2 <u class='defined-term'>BMRA</u>-F002: Calculate Indicative Period BM and RR Unit Total Accepted Bid and <u class='defined-term'>Offer</u> Volume</div>

<div data-id="5-5.3" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.3 <u class='defined-term'>BMRA</u>-F003: Calculate Estimated Period Balancing Mechanism and <u class='defined-term'>Replacement Reserve Bid</u> and <u class='defined-term'>Offer</u> Cashflows</div>

<div data-id="5-5.4-5.4.2" style="margin-left:0.59in;text-align:left;text-indent:-0.59in"><b>5.4.2 <u class='defined-term'>BMRA</u>-F004b: Calculate Estimated <u class='defined-term'>System</u> Buy and Sell Prices using the P217 methodology</b></div>

<div data-id="5-5.5" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.5 <u class='defined-term'>BMRA</u>-F005: Postponement of Calculations</div>

<div data-id="5-5.6" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.6 <u class='defined-term'>BMRA</u>-F006: Validate <u class='defined-term'>Market Index Data</u></div>

<div data-id="5-5.7" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.7 <u class='defined-term'>BMRA</u>-F007: Generate Missing <u class='defined-term'>Market Index Data</u> Messages</div>

<div data-id="5-5.8" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">5.8 <u class='defined-term'>BMRA</u>-F008: Process <u class='defined-term'>Market Index Data Provider</u> Liquidity Thresholds</div>

<div data-id="5-5.9" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.9 <u class='defined-term'>BMRA</u>-F009: Validate Adjustment Data</div>

<div data-id="5-5.10" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.10 <u class='defined-term'>BMRA</u>-F011: Process SO-SO Trades</div>

<div data-id="5-5.11" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">5.11 <u class='defined-term'>BMRA</u>-F012: Process <u class='defined-term'>Settlement Exchange Rate</u></div>

<div data-id="5" style="margin-left:0.59in;text-indent:-0.59in;text-align: justify">5 Functional Requirements</div>

<div data-id="6-6.1" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">6.1 Overview</div>

<div data-id="6-6.2" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">6.2 Inbound Interface Requirements</div>

<div data-id="6-6.3" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">6.3 Outbound Interface Requirements</div>

<div data-id="6" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">6 External interfaces</div>

<div data-id="7-7.1" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">7.1 <u class='defined-term'>BMRA</u>-N001: Security for <u class='defined-term'>BMRA</u> Service</div>

<div data-id="7" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">7 Non-Functional Requirements</div>

<div data-id="8-8.1" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.1 <u class='defined-term'>BMRA</u>-S001: High Grade <u class='defined-term'>BMRA</u> Service Availability</div>

<div data-id="8-8.2" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.2 <u class='defined-term'>BMRA</u>-S002: Low Grade <u class='defined-term'>BMRA</u> Service Availability</div>

<div data-id="8-8.3" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.3 <u class='defined-term'>BMRA</u>-S003: Data Storage</div>

<div data-id="8-8.4" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.4 <u class='defined-term'>BMRA</u>-S005: Data Access and Display</div>

<div data-id="8-8.5" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.5 <u class='defined-term'>BMRA</u>-S006: Volumetric Requirements</div>

<div data-id="8-8.6" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8.6 <u class='defined-term'>BMRA</u>-S007: Resilience Requirements</div>

<div data-id="8" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">8 Service Requirements</div>

<div data-id="9" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">9 User Roles and Activities</div>

<div data-id="10" style="margin-left:0.59in;text-align:left;text-indent:-0.59in">10 Future Enhancements</div>

<div data-id="appendix-a-glossary" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix A Glossary</div>

<div data-id="appendix-b-requirement-summary-matrix" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix B Requirement Summary Matrix</div>

<div data-id="appendix-c-bmra-external-data-flow-timings-and-formats" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix C <u class='defined-term'>BMRA</u> external data flow timings and formats</div>

<div data-id="appendix-d-bmra-forecast-data-time-line" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix D <u class='defined-term'>BMRA</u> forecast data time-line</div>

<div data-id="appendix-e-bmra-settlement-period-time-line" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix E <u class='defined-term'>BMRA</u> settlement period time-line</div>

<div data-id="appendix-f-logical-data-model" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix F Logical Data Model</div>

<div data-id="appendix-g-price-derivation-code-definitions" style="margin-left:0.79in;text-align:left;text-indent:-0.79in">Appendix G Price Derivation <u class='defined-term'>Code</u> Definitions</div>

CONTENTS

Balancing Mechanism Reporting Agent V25.0

Defined Terms

Cross-references