MHHS Governance Framework

Ofgem approval of P413 – Enable Elexon to be the Programme Manager for the implementation of Market-wide Half-Hourly Settlement places an obligation on Elexon to perform the MHHS Implementation Manager role and obligations on MHHS parties to deliver the MHHS Programme.

BSC MHHS Governance Framework published

Ofgem has published the BSC MHHS Governance Framework and Update: Designating the MHHS Governance Framework.

Ofgem’s BSC MHHS Governance Framework document identifies the elements of the governance framework to enable the objectives and benefits of the MHHS Programme to be delivered as an industry-led programme. The framework is designed to enable the Programme to run efficiently and to support rapid constituency-based decision-making.

Ofgem has now transitioned the SRO role to Elexon. Ofgem will retain overall accountability for MHHS as Programme Sponsor. Ofgem will not be involved in the day-to-day management or decision-making of the Programme, but will continue to make certain decisions, if above the defined level 1 thresholds.

Here you can find the latest MHHS Programme Governance Framework. 

If you have any questions, please email [email protected]


Click here to view the MHHS Governance and Decision-making structure


Here you can view the Market-wide Half-Hourly Settlement (MHHS) Level 2 and Level 3 constituency representatives

Here you can view the nomination, election and appointment process and you can download the nomination form.

The meeting dates for the Level 2 and Level 3 groups are:

  • • Programme Steering Group (PSG): first Wednesday of every month
  • • Design Advisory Group (DAG): second Wednesday of every month
  • • Testing and Migration Advisory Group (TMAG): third Wednesday of every month
  • • Cross-Code Advisory Group (CCAG): fourth Wednesday of every month

For more information about the Programme decision groups, please see the MHHS Programme Governance Framework document.

If you have any questions, please email [email protected].



We are now interactively sharing our Design Artefacts with the Level 4 Working Groups in the Design Document Library on our Market-wide Half-Hourly Settlement (MHHS) Portal. The library contains all the working documents that are currently under review within the sub-working groups, and the Level 4 Working Groups, along with consolidated comments logs making it easier for everyone to contribute to the design activity. Please note, you do need to be registered on the MHHS Collaboration Base to access these links. To request access, please email [email protected].

Design Artefacts have been grouped into four tranches and, once agreed in the sub-working groups, each tranche will be issued for wider review by the Level 4 Business Process and Requirements Working Group (BPRWG). The documents will then be submitted to the Design Advisory Board (DAG) for approval between now and the Design baseline at the end of July 2022.

The Technical Design Working Group have agreed the Functional Specification and Non-Functional Requirements for the Data Integration Platform (DIP) which have been issued to bidders as part of the Request for Proposal activity, and the Security Design Working Group are reviewing the end-to-end Security Requirements.

We have also set up a Consequential Change Impact Assessment Group (CCIAG) to identify and discuss items that are not being considered as part of the scope of the MHHS Target Operating Model (TOM), or design, that may have an impact on existing systems and processes for Programme Parties. This also provides parties the opportunity to discuss and share information on those items. The first CCIAG meeting will be at the end of June/early July.

You can find a schedule of the upcoming Working Group meetings in the Design Document Library here.

If you would like to attend any of the Design Working Groups, please email [email protected]

You can also view the Terms of Reference for each of the Working Groups below:


The Testing and Migration Advisory Group (TMAG) is an active Level 3 Working Group which meets on the third Wednesday of the month. It oversees all aspects of testing including testing of the Migration process. TMAG approved the End-to-end (E2E) Testing and Integration Strategy which sets out the strategy for the testing required for the MHHS Programme.

To assist in its work, TMAG has several active Level 4 Working Groups (more groups will be required in due course), namely the Data Working Group (DWG) and the Migration Working Group (MWG).

Data Working Group
The DWG is responsible for:

  • • defining the requirements for the test data to be used
  • • determining the test data source
  • • confirming the method to generate test data (if required)
  • • securely managing the data
  • • maintaining and determining how the test data will be distributed to participants

The DWG successfully developed the E2E Test Data Strategy which was approved by TMAG.

Migration Working Group
The MWG is responsible for developing the migration strategy and processes from an operational perspective. This is informed by the E2E MHHS Design and the process required to migrate an individual Meter Point Administration Number (MPAN) from the existing arrangements, over to the new arrangements.

The MWG will also develop the approach to test the migration processes in terms of roles/responsibilities, resourcing, governance, test management, entry/exit criteria, test tools, test scenarios and assurance. Output from the MWG will consist of:

  • • Migration, Cutover & Data Strategy
  • • Migration Testing Approach and Plan
  • • Further migration documentation as appropriate

Future Working Groups
There will be several Level 4 Working Groups established to support other aspects of testing and we will let you know about these nearer the time of formation.

Level 4 Working Groups are open to all Subject Matter Experts (SMEs) in the specific topic area.

If you would like to attend any of the Testing & Migration Working Groups, please email [email protected]

Working Group Terms of Reference
You can also view the Terms of Reference for each of the Working Groups below:

High Level Programme Structure

The Lead Delivery Partner (LDP) is required to deliver four key service roles:

1. Central Programme Team (CPT)

2. Programme Management Office (PMO)

3. Programme Party Coordinator (PPC)

4. Systems Integrator (SI)

An industry-led governance model will ensure the decision making between the SRO, Implementation Manager (IM) and MHHS Programme participants is appropriately balanced. The model will ensure that the SRO is empowered to make decisions on behalf of the industry, but is accountable to, and has engaged and consulted with MHHS Programme participants.