M10/M11 Cutover Plan

The M10/M11 Cutover Plan sets out the activities that MHHS participants are required to carry out in the lead up to M10, at M10, and between M10 and M11 to enable the Programme to successfully reach both M10 and M11 respectively.

It outlines:

• What these activities are 
• When they are expected to take place 
• Who the responsible parties are 
• The declaration requirements that participants will be expected to follow  
• Key dependencies that may impact particular activities 

In May 2025, the Programme received Participant Cutover plans from Licensed Distribution System Operators (LDSOs), Central Parties and Systems Integration Testing (SIT) Suppliers & Agents.

Following a review of these plans, the Programme has published an updated consolidated Programme M10/M11 Cutover plan for consultation.

If participants have any comments on the updated M10/M11 Cutover Plan, please use the Comments Log template available below, and share your comments with the Operational Readiness team by 17:00 on Friday 11 July 2025.  

In addition, those parties that receive feedback from the Programme on their Cutover Plans will be required to submit updated submissions as detailed in the Participant Cutover Plans section below.

Please note that this includes the submission of an updated participant Cutover Plan template which has been updated to reflect the updated Cutover Plan.  

You can view the following artefacts below:

• Clean and red-lined versions of the Consolidated Plan 
• Delivery plan 
• Comments Log

M10/M11 Consolidated Cutover Plan v1.2 (Clean)

M10/M11 Consolidated Cutover Plan v1.2 (Red-lined)

M10/M11 Cutover Delivery Plan v1.2

M10/M11 Cutover Plan Consultation Comments Log

Please share any feedback you have with the Programme, and if required, an updated Cutover Plan, by 17:00 on Friday 11 July 2025.  

If you have any questions, please email the Transition & Operational Readiness team at OpReadiness@mhhsprogramme.co.uk 

Cutover Consultation timelines and engagement

The Operational Readiness team will also host two engagement sessions, with: 

1. LDSOs and Electricity Enquiry Service (EES) at 13:00 on Wednesday 2 July 2025  
2. SIT Suppliers & Agents that are required to submit a Cutover Plan to the Programme at 11:00 on Thursday 3 July 2025

We have also included a slide below which outlines the engagement approach we are taking to the Cutover Plan.

If you have any questions, please email the Transition & Operational Readiness team at OpReadiness@mhhsprogramme.co.uk 

Participant Cutover Plans

As detailed through the Transition & Operational Readiness Working Group (TORWG), the Programme requested that Central Parties, Licensed Distribution System Operators (LDSOs), Systems Integration Testing (SIT) Suppliers and SIT Agents share a Cutover Plan with the Programme.

These plans outline the technical cutover activities that each participant must undertake to ensure that their systems are fully deployed, operational, and comply with the M10/M11 Cutover Plan deadlines, enabling the Programme to successfully meet both the M10 and M11 milestones.

The Programme has reviewed all Participant Cutover Plans and individual feedback was issued on Friday 27 June 2025. Participants are required to respond to the feedback that they receive through an updated submission, in line with the request below by 17:00 on Friday 11 July 2025. 

LDSOs, SIT Suppliers and SIT Agents that have received feedback from the Programme on their Cutover Plan submissions are requested to submit an updated Cutover Plan and response template following publication of the Consolidated Programme M10/M11 Cutover Plan, and validate that their plan aligns with the updated Programme Cutover Plan. 

Please note that the templates that participants are required to submit have been updated and participants are required to complete the new template and submit it along with their Cutover Plan.  

You can view the Consolidated Programme M10/M11 Cutover Plan above on this page.

The deadline to submit updated participant plans is 17:00 on Friday 11 July 2025.  

You can view the updated constituency group templates in the libraries below.  

Please submit all plans and templates to Opreadiness@mhhsprogramme.co.uk    

If you have any questions, please also email Opreadiness@mhhsprogramme.co.uk