Migration Baselined Documents Repository
On this page you can find relevant Migration baselined documents including the Migration Framework artefacts. All the documents on this page were baselined by the Migration & Cutover Advisory Group (MCAG) and its predecessor, the Testing & Migration Advisory Group (TMAG) between November 2023 and April 2025.
The Migration Framework artefacts detail the principles, controls, roles, processes and responsibilities regarding Migration, as well as the role of the Migration Control Centre (MCC) and its activities and interactions with participants.
You can view these artefacts in the first library, MHHS Migration Framework Approved Artefacts, below.
The Migration Thresholds document defines the upper thresholds that limit the number of migrations that can be initiated across Industry on a particular day. The document also breaks down the thresholds to the Licensed Distribution System Operator (LDSO) level. This ensures that LDSOs are aware of the maximum number of migrations they will be expected to support.
Appendix 1 summarises the modelling that was used to define the thresholds for LDSOs as set out in the Migration Thresholds document.
The M15 Acceptance Criteria document defines the acceptance criteria for M15, including the Meter Point Administration Number (MPAN) states that will be 'acceptable' and 'unacceptable' at M15. M15 is currently defined as "Full Transition Complete", i.e. all MPANs have been migrated to the MHHS arrangements, and none remain in the legacy arrangements.
The Migration, Cutover and Data Strategy document sets out the strategy and approach the MHHS Programme followed to develop a suite of policies, processes and other artefacts to support Migration, Cutover, Data Cleansing and Population. The document also details the strategic principles that the Programme followed to develop these detailed artefacts, as well as the timescales under which the development occurred.
You can find these four documents in the second library, Other Migration Artefacts, below.
You can view other information and guidance in the Migration Guidance Artefacts library at the bottom of this page.
MHHS Migration Framework Approved Artefacts
Other Migration Artefacts
| Short Name | Doc Number | Subtype | Theme | Version |
|---|---|---|---|---|
| Migration, Cutover and Data Strategy | MHHS-DEL1128 | Other Migration Artefacts | 1.0 | |
| Migration Thresholds Document | MHHS-DEL1648 | Other Migration Artefacts | v2.0 | |
| M15 Acceptance Criteria | MHHS-DEL1792 | Other Migration Artefacts | v3.0 | |
| Migration Threshold Document Appendix 1 v1.0 | MHHS-DEL1657 | Other Migration Artefacts | 1.0 |
Migration Guidance Artefacts
| Short Name | Doc Number | Subtype | Theme | Version |
|---|---|---|---|---|
| Kestrel and Submission 2 - Updated Validation Rules | MHHS-DEL3785 | Strategy | Migration Guidance Artefacts | 1.0 |
| Migration Sprint Cycle Dates | MHHS-DEL3998 | Strategy | Migration Guidance Artefacts | v1.1 |
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