Red-lined Design Artefacts: Interim Release 7, 7.1, 7.2 and 7.3
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 They are retained for historical reference only.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Documents are now the single source of truth, and any changes made through Code governance will not appear in the historical documents.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 7, 7.1, 7.2 and 7.3 are available in the respective libraries below.
The Programme has now baselined Interim Release 7 of the Design Artefacts. Clean versions of these Artefacts are published in the respective libraries of the Baselined Design Artefacts page of this website.
We have listed the Artefacts in their own libraries to support participant engagement with the Artefacts.
Red-lined Design Artefacts: Interim Release 7.3
On Wednesday 8 May 2024, the Programme published Interim Release 7.3 Design Artefacts.
Interim Release 7.3 contains seven Design Issue Notifications (DINs), correcting errors in Elexon Central Systems (ECS) Reports and defects in Swagger ahead of Systems Integration Testing (SIT) Cycle 2 on Monday 10 June 2024.
Full details of the issues addressed are covered in the accompanying Release Note below:
Release Note for Interim Release 7.3
| Short Name | Doc Number | Sub Type | Status | Version |
|---|---|---|---|---|
| Physical interfaces - Data Types - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Interfaces Event Codes - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Real Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Data Catalogue - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - ECS Common Blocks - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical Interfaces - Real Common Blocks - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Interfaces Event Codes - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - ECS Reports - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - ECS Reports - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Interface Catalogue (redlined) | DES138 | Interface Specifications | Approved | v5.7.3 |
| Physical interfaces - ECS Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Data Catalogue - json | E2E003 | Technical Design | Approved | v1.7.3 |
| Physical interfaces - Data Types - json | E2E003 | Technical Design | Approved | v1.7.3 |
Red-lined Design Artefacts: Interim Release 7.2
On Wednesday 3 April 2024, the Programme published Interim Release 7.2 Design Artefacts.
Interim Release 7.2 incorporates changes to Swagger.
Full details of the issues addressed are covered in the accompanying Release Note below:
Release Note for Interim Release 7.2
| Short Name | Doc Number | Sub Type | Status | Version |
|---|---|---|---|---|
| Physical interfaces - ECS Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - ECS Common Blocks - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical Interfaces - Real Common Blocks - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Data Catalogue - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Data Types - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - ECS Reports - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - ECS Reports - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Data Types - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Data Catalogue - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Real Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Interfaces Event Codes - json | E2E003 | Technical Design | Approved | v1.7.2 |
| Physical interfaces - Interfaces Event Codes - yaml | E2E003 | Technical Design | Approved | v1.7.2 |
Red-lined Design Artefacts: Interim Release 7.1
On Wednesday 6 March 2024, the Programme published Interim Release 7.1 Design Artefacts.
Interim Release 7.1 incorporates changes to Swagger and the DES-138 Interface Catalogue.
Full details of the issues addressed are covered in the accompanying Release Note below:
Release Note for Interim Release 7.1
| Short Name | Doc Number | Sub Type | Status | Version |
|---|---|---|---|---|
| Physical interfaces - ECS Common Blocks - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Examples | E2E003 | Technical Design | Approved | v0.5 |
| ECS Reports - External (redlined) | ERI011B | Interface Specifications | Approved | v5.6.1 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.1 |
| Interface Catalogue (redlined) | DES138 | Interface Specifications | Approved | v5.7.2 |
| Physical interfaces - Examples | E2E003 | Technical Design | Approved | v0.5 |
| End to End Solution Architecture (redlined) | E2E001 | Technical Design | Approved | v3.6.1 |
| Physical interfaces - ECS Reports - json | E2E003 | Technical Design | Approved | v1.7.1 |
| End to End Non Functional Requirements (redlined) | E2E002 | Technical Design | Approved | v3.2 |
| Physical interfaces - Interfaces Event Codes - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Data Types - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Data Catalogue - json | E2E003 | Technical Design | Approved | v1.7.1 |
| ISD Entities (redlined) | EDI021 | Supporting Document | Approved | v5.5.1 |
| Physical interfaces - Data Types - json | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - ECS Common Blocks - json | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Data Catalogue - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Interfaces Event Codes - json | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - ECS Reports - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Submit Events - yaml | E2E003 | Technical Design | Approved | v1.7.1 |
| Physical interfaces - Submit Events - json | E2E003 | Technical Design | Approved | v1.7.1 |
