Changes to Supply Number Format for MHHS
Date of latest update
Type
Change
ID
R0083
Change Category
Priority
Urgent
No
Latest Update
22/09/25 - This Change Proposal has been implemented as part of the MHHS M8 22 September 2025 REC Release.
Summary
The Electricity Supply License requires Suppliers to provide the Supply Number to each Consumer on every bill, or at least once per year where no bill has been sent. The Supply Number format is prescribed by the REC and is detailed in the Energy Market Data Specification. The MHHS design is changing the data associated with each individual metering point, including those data items currently displayed within the Supply Number top line. To support Electricity Supplier implementation of the MHHS arrangements, a clearly defined solution is required setting out a revised approach to populating the Supply Number on Consumer’s bills and statements.
Change Plan
Solution development completed
Completed
Start:
05 Dec 2022Due:
31 Mar 2023Completion:
31 Mar 2023Party Impact Assessment issued
Completed
Start:
31 Mar 2023Due:
06 Apr 2023Completion:
06 Apr 2023Party Impact Assessment closed
Completed
Start:
06 Apr 2023Due:
02 May 2023Completion:
02 May 2023Preliminary Change Report issued
Completed
Start:
02 May 2023Due:
25 May 2023Completion:
26 May 2023REC Change Panel review of PCR
Completed
Start:
25 May 2023Due:
06 Jun 2023Completion:
06 Jun 2023Consultation issued
Completed
Start:
06 Jun 2023Due:
09 Jun 2023Completion:
09 Jun 2023Consultation closed
Completed
Start:
09 Jun 2023Due:
30 Jun 2023Completion:
30 Jun 2023Final Change Report issued
Completed
Start:
30 Jun 2023Due:
21 Jul 2023Completion:
20 Jul 2023REC Change Panel decision
Completed
Start:
21 Jul 2023Due:
01 Aug 2023Completion:
01 Aug 2023Authority Determination requested
Completed
Start:
01 Aug 2023Due:
03 Aug 2023Completion:
02 Aug 2023Alternative Change Proposals
Status
Implementation Date
MHHS Programme Milestone M8 (Code changes delivered)
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As an electricity Consumer I want to be able to provide my prospective Energy Supplier with the necessary information for them to provide a suitable tariff. As a Non-Domestic Consumer, I want to have the necessary information that will allow me to access tariff information, specific to my business, to help me manage my energy. As an electricity Consumer, I want to have access to the data that will help me appoint my own Metering Equipment Manager (MEM) where permitted.
- As a Supplier, I want to know how to populate and format the Supply Number, so that I can meet my obligations to include it in Consumer bills or statements. As a Third Party Intermediary (TPI), I want Consumers to be able to provide me with the right information to provide appropriate quotes.
- As an independent Distribution Network Operator, I want to be able to identify and use the DUoS Tariff Id so that I can provide transparency on charging that is being applied to my customers. As the Electricity Enquiry Service (EES) Provider, I want to know how to populate the Supply Number so that I can make it available on the EES
Proposed Solution Document
Document title
Approved Solution for R0083 v1.0 26.05.2023
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Document title
Approved Legal Text R0083 Supply Number Format redlining v2.0
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Document title
R0083 - Guidance for Supply Number population v2.0
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Document title
All Solution documents and legal text 06.06.2023 (For PCR)
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Document title
Proposed Solution for R0083 v1.0 26.05.2023 (For PCR)
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Document title
Legal text - Option 1 (R0083) Supply Number Format redlining v2.0 26.05.2023 (For PCR)
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Document title
Proposed Solution for R0083A v2.0 06.06.2023 (For PCR)
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Document title
Legal text - Option 3 (R0083A) Supply Number Format redlining v1.0 26.05.2023 (For PCR)
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Document title
R0083 and R0083A Solution Options Draft Legal Text (IA) 06.04.2023
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Document title
R0083 and 83A - Solution Options v1.0 (Impact Assessment) 06.04.2023
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Problem Statement
The Market-wide Half Hourly Settlement design is impacting the Data Items that are used in the top line of the Supply Number, which Energy Suppliers are obliged to provide to Consumers at least once a year under their Licence. A revised definition of the Supply Number format is required so that Electricity Suppliers have a clear understanding of the approach to populating the Supply Number for metering points that have migrated to the new MHHS arrangements.
Stages Selection
SME
SME Role
Lead Technical Analyst
MHHS Supply Number Consultation Response Summary Anon 08.11.2022
MHHS Supply Number Consultation 14.10.22
R0083 - Change Proposal Form
R0083 and R0083A Initial Assessment Report v2.0 (Approved) 22.02.2023
R0083 and 83A Change Proposal Plan v2.0 (Approved) 22.02.2023
R0083 and 83A Consolidated Party Impact Assessment Responses v2.0 PUBLIC 07.06.2023
R0083 and R0083A Preliminary Change Report v1.0 (Pre-Approval) 26.05.2023
R0083 and R0083A Preliminary Change Report v2.0 (Approved) 07.06.2023
R0083 and R0083A Consolidated Consultation Responses v1.0 PUBLIC 20.07.2023
R0083 and R0083A Final Change Report v2.0 (Post-Vote) 02.08.2023
Decision to approve REC Change Proposal R0083 Changes to Supply Number Format
Company Name
-
Review status
Review required
Changes to the REC Charging Statement for R0052
Date of latest update
Type
Change
ID
C3-0036
Urgent
No
Latest Update
-
Summary
This change is required to ensure that the GES standard reporting shown within the REC Charging Statement correctly reflects the reports it needs to from the GES Definition document, with the correct frequencies the reports are available in.
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RPS)
Review status
Review required
Improvements to ‘Failed to Deliver’ CSS Messages
Date of latest update
Type
Change
ID
R0080
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the REC Release on 27 June 2025.
Summary
Since CSS Go-Live a large number of messages have not been successfully delivered due to failures of CSS User's gateways, resulting in CSS exhausting the 12-hour retry period. This Change Proposal has been raised to explore and address this issue
Change Plan
Service Provider Impact Assessment close
Completed
Start:
09 Nov 2022Due:
25 Jan 2024Completion:
25 Jan 2024Party Impact Assessment trigger
Completed
Start:
25 Jan 2024Due:
02 Feb 2024Completion:
02 Feb 2024Party Impact Assessment close
Completed
Start:
02 Feb 2024Due:
23 Feb 2024Completion:
23 Feb 2024Preliminary Change Report and Consultation issued
Completed
Start:
23 Feb 2024Due:
10 May 2024Completion:
10 May 2024Consultation close
Completed
Start:
10 May 2024Due:
03 Jun 2024Completion:
03 Jun 2024Responsible Committee Decision
Completed
Start:
24 Jul 2024Due:
31 Jul 2024Completion:
31 Jul 2024Final Change Report Issued
Completed
Start:
03 Jun 2024Due:
24 Jul 2024Completion:
19 Jul 2024Impacted Consumers
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Date
27 June 2025
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Consumer, I want the Switching process to work successfully, so that I can switch Energy Supplier without delays or issues.
- As the CSS Provider I want the messages I send to CSS Users to be received and processed successfully, so that there is no interruption to the Switching process or the Consumers’ Switching experience.
- As the CSS User I want to receive CSS messages in a timely manner following any outage of my own gateway or systems, so that there is no interruption to the Switching process or the Consumers’ Switching experience.
Proposed Solution Document
Document title
R0080 - Solution Development Report 11.01.2024
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Document title
CSS Interface Design Specification v8.9.0 R0080 - REDLINE
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Document title
CSS Failed To Deliver Detailed Design (R0080) v1.3 (19.06.2024)
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Document title
Business Data Validation Rules v1.5.0 R0080 - REDLINE
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Document title
Schedule 24_Switching Data Management v1.2_R0080 Draft (19.06.2024)
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Problem Statement
Following an unexpected or extended period of gateway outage for a CSS User, there is currently no automated process to resend any CSS messages from the CSS Provider that were triggered during the period of outage. This results in the CSS Provider needing to manually correct any issues, which is time consuming and may affect Consumer Switches due to delays in messages being processed.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
caroline.milner@capgemini.com
SME Role
Lead Assurance Analyst
R0080 - Change Proposal form
R0080 Onboarding document
R0080 - Change Proposal Plan (Approved) 16.01.2024
R0080 - Rebaselined Change Plan (26.04.2024)
R0080 - Initial Assessment Report (Approved) 16.01.2024
R0080 Consolidated Party IA Responses v1.0 (10.05.2024)
R0080 - Preliminary Change Report v1.0 (Published for Consultation) 10.05.2024
R0080 Consolidated Consultation Responses (19.06.2024)
R0080 - Final Change Report v2.0 (Approved) 31.07.2024
Company Name
-
Review status
Review required
Performance Assurance Operating Plan (PAOP) Updates for Year 2
Date of latest update
Type
Change
ID
C3-0035
Urgent
No
Latest Update
-
Summary
The PAOP has now been finalised following the consultation that took place in early October. The PAOP sets out Performance Assurance activity for the upcoming year, and is reviewed on a quarterly basis to determine whether any activity needs to be changed or re-prioritised.
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RPA)
Review status
Review required
EMR Settlement Limited - additional access to EES
Date of latest update
Type
Change
ID
R0078
Change Path
Priority
Urgent
No
Latest Update
29/09/23 - This change was implemented on 29 September 2023 as part of an Extraordinary REC Release
Summary
This Change proposal seeks to extend the access permitted in the Electricity Enquiry Service (EES) for Electricity Market Reform Settlement (EMRS) Limited to enable the completion of metering assessments and change of supply checks where Capacity Provider’s portfolio includes domestic Consumers.
Change Plan
SERVICE PROVIDER IMPACT ASSESSMENT ISSUED
Completed
Start:
26 Oct 2022Due:
07 Jul 2023Completion:
11 Aug 2023PRELIMINARY CHANGE REPORT AND CONSULTATION ISSUED
Completed
Start:
07 Jul 2023Due:
18 Aug 2023Completion:
18 Aug 2023FINAL CHANGE REPORT ISSUED
Completed
Start:
18 Aug 2023Due:
08 Sep 2023Completion:
08 Sep 2023RESPONSIBLE COMMITTEE DECISION
Completed
Start:
08 Sep 2023Due:
15 Sep 2023Completion:
15 Sep 2023Status
Implementation Date
29 September 2023
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As EMRS I want to have an appropriate understanding of the portfolio so that I am able to complete metering assessments and checks on Switches so that I can fulfil my role.
- As the EES Provider I want to be able to provide access to EMR Settlement Limited as set out in the Data Access Matrix.
Proposed Solution Document
Document title
R0078 - Electricity Data Access Matrix v3.3 (17.08.2023)
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Problem Statement
EMRS are experiencing an increasing occurrence of domestic Consumers being included in Capacity Provider portfolios. Currently they have limited availability to data on domestic Consumers, making the completion of assessments and checks difficult. Access to data held in the EES for domestic metering points will enable EMRS to complete these tasks that are required to appropriately include domestic provider contributions in the overall view of the Capacity Market.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0078 Change Proposal Form
Redlined DAM (Provided by the Proposer)
R0078 Change Proposal Plan v1.0 (Approved) 18.07.2023
R0078 Initial Assessment Report v1.0 (Approved) 18.07.2023
R0078 Preliminary Change Report
R0078 - Non Confidential Consultation Responses
R0078 - Final Change Report v2.0 post vote
Company Name
-
Review status
Review required
Updates to Gas Enquiry Service Portal User Guide Supplementary Document
Date of latest update
Type
Change
ID
C3-0034
Urgent
No
Latest Update
-
Summary
Minor Changes to the content to include links to Xoserve.com and to remove slides which are no longer relevant. *********Slides removed from V1.0 are 39-46 as there is no concept of Service Roles in the new system. Hence this section (9 Slides) have been removed **********Slide 50 and 51 as LSO's can't reset the password of the users in the new system. There is no concept of service roles. Hence those slides have been removed ************Slide 54 as there is no concept of unlocking the users in the new system. Hence removed **************Appendix slide 56-62 as these features are not available in the new system. Hence removed **************The changes will have no obligation for REC parties to take any additional actions
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
GES Provider
Review status
Review required
Release of Community View Data Items to MEMs in GES
Date of latest update
Type
Change
ID
R0074
Change Category
Change Path
Priority
Urgent
No
Latest Update
05/06/2023 The system changes associated with this change were successfully implemented as planned on Friday 02 June 2023.
Summary
This Change Proposal will enable MEMs to ‘Community View’ access to a limited set of data in the GES, for sites where they are not the appointed MEM.
Change Plan
Service Provider Impact Assessment
Completed
Start:
05 Oct 2022Due:
21 Nov 2022Completion:
16 Dec 2022Party Impact Assessment
Completed
Start:
21 Nov 2022Due:
21 Nov 2022Completion:
18 Dec 2022Preliminary Change Report Issued
Completed
Start:
21 Nov 2022Due:
13 Jan 2023Completion:
13 Jan 2023Consultation closure
Completed
Start:
13 Jan 2023Due:
27 Jan 2023Completion:
27 Jan 2023Responsible Committee Decision
Completed
Start:
27 Jan 2023Due:
22 Feb 2023Completion:
22 Feb 2023Impacted Consumers
Impacted REC Services
Status
Implementation Date
24 February 2023
| Included changes | Affected REC Items | |
|---|---|---|
| R0130 | Updates to the Data Access Matrix |
|
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Consumer, I want a Metering Equipment Manager to be able to access and validate my site details, ahead of their arrival on site for planned or emergency metering work, so that I do not experience any delays in work being completed and can have continuity of supply.
- As a MEM, I want access to sufficient data for sites where I am not the Appointed MEM, to enable me to complete pre-metering works validations of the site details, so I can undertake these works correctly and safely.
- As a MEM, I want access to data for sites where I am not the Appointed MEM, so I can confirm de-appointments and answer invoice validation queries.
Proposed Solution Document
Document title
GES Data Access Matrix for R0074
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Problem Statement
At go-live for REC v3.0 the ‘Community View’ access to data in the GES, previously available via the DES under the UNC, was inadvertently removed. MEMs used this data in a number of processes, including validation of site details prior to metering works – particularly for emergency work, and the resolution of invoice queries from Suppliers. Without access to this Enquiry Service Data, MEMs are unable to complete activities that are central to their operations, including checking site details prior to attending emergency metering works. This has the potential to have a direct negative impact on the experience of metering works for Consumers, and in in some cases, continuity of supply and safety could be at risk.
Stages Selection
Change Proposal Form
R0074 - Change Proposal Plan v1.0
R0074 - Initial Assessment Report v1.0 (Approved)
R0074 - Consultation Responses_NON CONFIDENTIAL
R0074 - Preliminary Change Report v1.0 (Published for Consultation)
R0074 - Final Change Report v2.0 (Post-Vote) 22.02.2023
Company Name
Xoserve
Review status
Review required
Introduction of a Housekeeping Change Proposal Process
Date of latest update
Type
Change
ID
R0073
Change Category
Change Path
Priority
Urgent
No
Latest Update
02/04/2023 - Change Proposal implemented 01 April 2023
Summary
Introduction of a proportionate change process for the implementation of housekeeping changes to the REC. This change will also implemented other non-material housekeeping changes to Schedule 5 - Change Management. These are being progressed alongside the introduction of a housekeeping change process to enable an efficient delivery.
Change Plan
Preliminary Change Report
Completed
Start:
27 Sep 2022Due:
27 Jan 2023Completion:
27 Jan 2023Preliminary Change Report Consultation Start (due to end 10/02/23)
Completed
Start:
27 Jan 2023Due:
27 Jan 2023Completion:
10 Feb 2023Final Change Report
Completed
Start:
27 Jan 2023Due:
28 Feb 2023Completion:
24 Feb 2023Responsible Committee Decision
Completed
Start:
28 Feb 2023Due:
07 Mar 2023Completion:
07 Mar 2023Status
Implementation Date
01 April 2023
| Included changes | Affected REC Items | |
|---|---|---|
| R0100 | Update to Error Handling Documents |
Implementation Status
Date Raised
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As the Code Manager I want to be able to progress change to the REC in the most efficient way possible. Where minor, non-material changes are needed to correct typographical or consistency errors, or to update out of date reference, I want a simpler and more accelerated change process to manage these housekeeping activities.
- As a REC Party, I want the Code Manager to use a more efficient process for housekeeping changes, that reduces the burden of managing industry changes through the standard change process.
- As RECCo I want the Code Manager to use the most efficient and simplest process to manage housekeeping changes in order to free up Code Manager resources to progress higher priority changes.
Proposed Solution Document
Document title
R0073 - Final Legal Text v1.0 24.02.23
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Document title
Draft Legal Text Schedules 1 and 5 Changes V1.0
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Document title
R0073 - Process Flow diagram
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Problem Statement
Typographical errors, formatting, and consistency errors (such as Paragraph numbering), out-of-date references to documents and updating addresses (including email) all have to go through the standard change process. In these cases, the changes are not material and do not need a solution to be developed nor do they need to demonstrate that they meet a business case and could therefore be progressed more quickly.
Stages Selection
Housekeeping Change Process Document v1.0
R0073- Housekeeping Change Proposal Process Change Form
R0073 - Change Proposal Plan R0073 v1.0 (Approved)
R0073 Initial Assessment Report v1.0 (Approved)
R0073 - Consolidated Consultation Responses v1.0 24.02.23
R0073 - Preliminary Change Report - v1.0 (Published for consultation) - 27/01/2023
R0073 - Final Change Report V2.0 (Post Vote) - 09/03/2023
Company Name
-
Review status
Review required
DCC access to EES and GES
Date of latest update
Type
Change
ID
R0071
Change Category
Change Path
Priority
Urgent
No
Latest Update
21/11/2023 - R0071 is approved by Change Panel for implementation in February release.
Summary
This Change seeks to create a new User Category in REC Schedule 12 – Data Access, to allow the Switching Service Desk to access the Gas and Electricity Enquiry Services (GES and EES). This would result in more expeditious Service Desk ticket resolution and a positive indirect impact on consumer outcomes.
Change Plan
Service Provider Impact Assessment Due
Completed
Start:
25 Sep 2022Due:
21 Sep 2023Completion:
Preliminary Change Report Issued
Completed
Start:
21 Sep 2023Due:
06 Oct 2023Completion:
Responsible Committee Review
Completed
Start:
06 Oct 2023Due:
17 Oct 2023Completion:
17 Oct 2023Consultation Issued
Completed
Start:
17 Oct 2023Due:
20 Oct 2023Completion:
20 Oct 2023Final Change Report Issued
Completed
Start:
20 Oct 2023Due:
10 Nov 2023Completion:
10 Nov 2023Responsible Committee Decision
Completed
Start:
10 Nov 2023Due:
21 Nov 2023Completion:
21 Nov 2023Impacted REC Documents
Impacted REC Services
Status
Implementation Date
23 February 2024
| Included changes | Affected REC Items | |
|---|---|---|
| R0100 | Update to Error Handling Documents |
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Consumer, I want data relating to my energy supply to be handled appropriately, so that I can have a consistent and faultless switching experience.
- As the Switching Service Desk, I want to be able to access market data that lets me resolve tickets first time, so that I can provide a more efficient service to users. As the GES Provider, I want my users to be able to access information that helps them fulfil their objectives, so that the service is used as efficiently as possible. As the EES Provider, I want my users to be able to access information that helps them fulfil their objectives, so that the service is used as efficiently as possible.
Proposed Solution Document
Document title
R0071 Proposed Legal Text
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Problem Statement
The Switching Service Desk generates and resolves tickets relating to Switching Incidents and Switching Data queries for Market Participants. GES and EES data is currently unavailable to the Switching Service Desk and access would allow them to resolve tickets more effectively, resulting in a more efficient service and better SLA performance.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0071 - Change Proposal Form
R0071 Change Proposal Plan v2.0 (Approved) - 05.09.2023
R0071 Initial Assessment Report v1.0 (Approved) - 01.08.2023
R0071 Preliminary Change Report v1.0 (Approved) - 17.10.23
R0071 Consolidated Consultation Responses v1.0 - 10.11.23
R0071 Final Change Report V1.0 (Post-Vote) 21.11.23
Company Name
-
Review status
Review required
SDEP User Guide updates
Date of latest update
Type
Change
ID
C3-0033
Urgent
No
Latest Update
-
Summary
Following feedback from users during the V3 release, it was identified that the SDEP User Guide needed some updates to reflect the changes to escalations and other housekeeping improvements were identified.********* The REC Baseline Statement will also be updated to reflect the updated version of the SDEP User Guide
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RTS)
Review status
Review required