Red-lined Design Artefacts: Interim Release 1

Please note that as of 1 September 2025, the MHHS Programme Design mailbox, Design artefacts and the Design Issues Notification (DIN) log on the MHHS website are no longer monitored or updated. They are retained for historical reference only.

Following Milestone 8 (M8), the Target Operating Model (TOM) and MHHS Design were fully codified, and the Code Bodies no longer maintain standalone Programme artefacts. The live Code and Code Subsidiary Documents are now the single source of truth, and any changes made through Code governance will not appear in the historical documents.

You can view the latest artefacts online, directly from the respective Code Bodies websites, listed below:

Balancing & Settlement Code (BSC)

Retail Energy Code (REC)

Distribution Connection and Use of System Agreement (DCUSA)

For the latest information or to raise queries, please use the Elexon Support Portal or contact the respective Code Bodies directly.

The Red-lined Design Artefacts along with the Red-lined Design Artefacts Interim Release 1 Consolidated Comments Log are available below. The comment responses are focused on the Interim Release 1 amendments. 

Red-lined Design Artefacts Interim Release 1 Consolidated Comments Log

The Programme has now baselined Interim Release 1 of the Design Artefacts. Clean versions of these Artefacts are published in the respective libraries on the Baselined Design Artefacts page of this website.

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Red-lined Design Artefacts: Interim Release 1

Short Name Doc Number Sub Type Status Version
Data Processing Business Process (redlined) BP005 Business Process Diagrams Approved v5.1
Change of Registration Data Business Process Descriptions (redlined) BPD010 Business Process Descriptions Approved v5.1.1
Change of Metering Service Business Process Descriptions (redlined) BPD002 Business Process Descriptions Approved v5.1
Physical interfaces - Interfaces - yaml E2E003 Unclassified Approved v1.1
Physical interfaces - Data Catalogue - yaml E2E003 Unclassified Approved v1.1
Change of Registration Data Business Process (redlined) BP010 Business Process Diagrams Approved v5.1.1
Physical interfaces - Submit Events - yaml E2E003 Unclassified Approved v1.1
Physical Interfaces - Real Common Blocks - yaml E2E003 Technical Design Approved v1.1
IF-005 Use Case Guide (redlined) DES229 Supporting Document Approved v1.1.2
Physical interfaces - Submit Events - yaml E2E003 Unclassified Approved v1.1
Physical interfaces - Submit Events - json E2E003 Unclassified Approved v1.1
Physical interfaces - Interfaces - json E2E003 Unclassified Approved v1.1
Disconnection Business Process Descriptions (redlined) BPD007 Business Process Descriptions Approved v5.1.1
Physical interfaces - Data Catalogue - json E2E003 Unclassified Approved v1.1
Change of Service - Data Service Business Process (redlined) BP003 Business Process Diagrams Approved v5.1
Traceability Matrix (redlined) DES203 Supporting Document Approved v5.1
Change of Service - Metering Service Business Process (redlined) BP002 Business Process Diagrams Approved v5.1
Physical interfaces - Data Types - yaml E2E003 Technical Design Approved v1.1
Interface Catalogue (redlined) DES138 Interface Specifications Approved v5.1.2
Metering Service Requirements (redlined) BRS002 Business Requirements Approved v5.1
ECS Reports - Internal (redlined) ERI011A Interface Specifications Approved v5.1.1
Registration Service Requirements (redlined) BRS003 Business Requirements Approved v5.1.2
Change of Service - Metering Service - Forward Migration (redlined) DEL963 Business Process Diagrams Approved v1.1
Change of Service - Data Service - Forward Migration (redlined) DEL964 Business Process Diagrams Approved v1.1
Change of Connection Type and/or Market Segment Business Process (redlined) BP011 Business Process Diagrams Approved v5.1.1
End to End Solution Architecture (red-lined) E2E001 Technical Design Approved v3.1.1
Physical interfaces - Submit Events - json E2E003 Unclassified Approved v1.1
LDSO Overview Requirements (redlined) BRS005 Business Requirements Approved v5.1
Physical interfaces - Data Types - json E2E003 Unclassified Approved v1.1
ECS Reports - External (redlined) ERI011B Interface Specifications Approved v5.1
Change of Service - Metering Service - Forward Migration (redlined) DEL969 Business Process Descriptions Approved v1.1
Physical interfaces - Real Common Blocks - json E2E003 Technical Design Approved v1.1
Disconnection Business Process (redlined) BP007 Business Process Diagrams Approved v5.1.1
End to End Non Functional Requirements (redlined) E2E002 Technical Design Approved v3.1
Data Service Requirements (redlined) BRS001 Business Requirements Approved v5.1