Red-lined Design Artefacts


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 They are retained for historical reference only.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Documents are now the single source of truth, and any changes made through Code governance will not appear in the historical documents.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.


In February 2023, the Design Advisory Group (DAG) approved the re-baseline of the Design Artefacts.

Since then, the Programme has processed Design Issue Notifications (DINs) raised by Programme participants. These are published in the Design Issue Notification (DIN) Log, accessible below.  

Design Issue Notification (DIN) Log

Following review of the DIN Log by the Design Team, several Design Artefacts are being updated with red-lined changes for participant review. The Programme is publishing the Red-lined Design Artefacts through six Interim Releases, following the Design Review Process. The Interim Release schedule is available in the DIN Log, on the tab named ‘Release Timeline.’

Please use the links below to view the Red-lined Design Artefacts for Interim Releases 1-8.11:

Red-lined Design Artefacts: Interim Release 1

Red-lined Design Artefacts: Interim Release 2, 2.1, 2.2 and 2.3

Red-lined Design Artefacts: Interim Release 3

Red-lined Design Artefacts: Interim Release 4

Red-lined Design Artefacts: Interim Release 5, 5.1, 5.2, 5.3, 5.4 and 5.5

Red-lined Design Artefacts: Interim Release 6

Red-lined Design Artefacts: Interim Release 7, 7.1 , 7.2 and 7.3

Red-lined Design Artefacts: Interim Release 8-8.11

You can view the respective Release Notes for Interim Releases 1-8.11 in the library below.

Red-lined Design Artefacts will remain on this website until they have been approved, at which point the Baselined Design Artefacts will be updated.

The red-lined versions of the Design Artefacts should not be used by Programme participants to deliver against until they have been approved by the appropriate Programme governance forums. The Baselined Design Artefacts are published on the Baselined Design Artefacts page of this website.

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Design Interim Release Notes

You can view all Interim Release Notes in the library below.  

For more information or if you have any questions, please email Design@mhhsprogramme.co.uk 

Short Name Doc Number Sub Type Status Version
Design Interim Release 7.2 Note DEL1275 Release Note Approved v1.0
Design Interim Release 3 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.4 DEL1275 Release Note Draft v1.0
Design Interim Release 8.9 DEL1275 Release Note Approved v1.0
Design Interim Release 8.7 DEL1275 Release Note Approved v1.0
Design Interim Release 8.2 Note DEL1275 Release Note Approved v1.0
Design Interim Release 4 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.3 DEL1275 Release Note Draft v1.0
Design Interim Release 7 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5.5 Note DEL1275 Release Note Approved v1.0
Design Interim Release 2.3 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.1 Note DEL1275 Release Note Approved v1.0
Design Interim Release 7.3 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5.3 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5.4 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.11 DEL1275 Release Note Approved v1.0
Design Interim Release 7.1 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5.1 Note DEL1275 Release Note Approved v1.0
Design Interim Release 2 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8 Note DEL1275 Release Note Approved v1.0
Design Interim Release 2.1 Note DEL1275 Release Note Approved v1.0
Design Interim Release 6 Note DEL1275 Release Note Approved v1.0
Design Interim Release 5.2 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.6 DEL1275 Release Note Approved v1.0
Design Interim Release 8.8 DEL1275 Release Note Approved v1.0
Design Interim Release 2.2 Note DEL1275 Release Note Approved v1.0
Design Interim Release 8.5 DEL1275 Release Note Draft v1.0
Design Interim Release 8.7 Note DEL1275 Release Note Approved 1.1
Design Interim Release 8.10 DEL1275 Release Note Approved v1.0
Design Interim Release 1 Note DEL1275 Release Note Approved v1.0