Red-lined Design Artefacts: Interim Release 3
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 They are retained for historical reference only.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Documents are now the single source of truth, and any changes made through Code governance will not appear in the historical documents.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 for Interim Release 3 are available below.
The Programme has now baselined Interim Release 3 of the Design Artefacts. Clean versions of these Artefacts are published in the respective libraries on the Baselined Design Artefacts page of this website.
Red-lined Design Artefacts: Interim Release 3
| Short Name | Doc Number | Sub Type | Status | Version |
|---|---|---|---|---|
| ECS Reports - External (redlined) | ERI011B | Interface Specifications | Approved | v5.2 |
| Change of Service - Data Service - Forward Migration (redlined) | DEL964 | Business Process Diagrams | Approved | v1.3 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.3 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.3 |
| Physical interfaces - Data Types - json | E2E003 | Technical Design | Approved | v1.3 |
| Physical interfaces - Data Catalogue - yaml | E2E003 | Technical Design | Approved | v1.3 |
| Data Service Requirements (redlined) | BRS001 | Business Requirements | Approved | v5.3 |
| Change of Meter Business Process (redlined) | BP009 | Business Process Diagrams | Approved | v5.2 |
| Change of Registration Data Business Process (redlined) | BP010 | Business Process Diagrams | Approved | v5.2 |
| Interface Catalogue (redlined) | DES138 | Interface Specifications | Approved | v5.3.2 |
| ECS Reports - Internal (redlined) | ERI011A | Interface Specifications | Approved | v5.2 |
| LDSO Overview Requirements (redlined) | BRS005 | Business Requirements | Approved | v5.2 |
| Physical interfaces - Data Types - yaml | E2E003 | Technical Design | Approved | v1.3 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.3 |
| Change of Service - Data Service Business Process (redlined) | BP003 | Business Process Diagrams | Approved | v5.3 |
| Operational Choreography (redlined) | OPC001 | Method Statements | Approved | v5.2.6 |
| Change of Energisation Business Process (redlined) | BP008 | Business Process Diagrams | Approved | v5.1 |
| SDS Validation Estimation Method Statement (redlined) | METH001 | Method Statements | Approved | v5.2 |
| Metering Service Requirements (redlined) | BRS002 | Business Requirements | Approved | v5.2 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.3 |
| Physical Interfaces - Real Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.3 |
| Data Collection Business Process (redlined) | BP004 | Business Process Diagrams | Approved | v5.1 |
| ISD Entities (redlined) | EDI021 | Supporting Document | Approved | v5.2 |
| Physical interfaces - Data Catalogue - json | E2E003 | Technical Design | Approved | v1.3 |
| Registration Service Requirements (redlined) | BRS003 | Business Requirements | Approved | v5.2 |
| Supplier Overview Requirements (redlined) | BRS004 | Business Requirements | Approved | v5.1 |
| IF-005 Use Case Guide (redlined) | DES229 | Supporting Document | Approved | v1.3 |
| Physical interfaces - Real Common Blocks - json | E2E003 | Technical Design | Approved | v1.3 |
| End to End Solution Architecture (redlined) | E2E001 | Technical Design | Approved | v3.3 |
| Physical interfaces - Interfaces - json | E2E003 | Technical Design | Approved | v1.3 |
| Change of Connection Type and/or Market Segment Business Process (redlined) | BP011 | Business Process Diagrams | Approved | v5.3 |
| Change of Metering Business Process Descriptions (redlined) | BPD009 | Business Process Descriptions | Approved | v5.1 |
| Physical interfaces - Interfaces - yaml | E2E003 | Technical Design | Approved | v1.3 |
