CSS Retry Strategy
Date of latest update
Type
Change
ID
R0203
Change Category
Change Path
Priority
Urgent
No
Latest Update
08/11/2024 - This Change Proposal has been implemented as part of the November 2024 REC Release.
Summary
There is currently a mismatch within the Central Switching Service (CSS) system functionality and the legal text within the REC Switching Data Management Schedule. Within the schedule the retry strategy is defined as “retry sending the Market Message at intervals of 10 seconds, 20 seconds and 30 seconds from each attempt to send the Market Message. If these retry Market Messages also fail, then the Market Message shall be retried at intervals of one hour up to a maximum of 12 hours; after which delivery of the Market Message shall be abandoned and a Switching Incident raised in accordance with the Switching Service Management Schedule”. However, in response to an incident in 2022, the CSS Provider updated the retry strategy. This change seeks to amend the legal text in Section 2.4 of the Switching Data Management Schedule to reflect the retry strategy which is currently in operation in the CSS system.
Change Plan
Change Proposal Plan
Completed
Start:
15 Aug 2024Due:
17 Sep 2024Completion:
17 Sep 2024Consultation to be issued
Completed
Start:
17 Sep 2024Due:
20 Sep 2024Completion:
20 Sep 2024Consultation to close
Completed
Start:
20 Sep 2024Due:
04 Oct 2024Completion:
04 Oct 2024Final Recommendation Vote
Completed
Start:
04 Oct 2024Due:
15 Oct 2024Completion:
15 Oct 2024Status
Implementation Date
08 November 2024
| Included changes | Affected REC Items | |
|---|---|---|
| R0105 | Review of ONAGE SLAs |
|
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- The Switching Data Management Schedule Section 2.4 should be updated to reflect the current retry strategy: 1. a short interval retry sequence of 3 attempts at 20 second intervals 2. a long interval retry sequence of 12 attempts at 1 hour intervals. The CSS Provider has confirmed that there is now a process in place that would prevent any future updates to the retry strategy without a change request being raised in the first instance.
Proposed Solution Document
Document title
CSS Retry Strategy Redlining
Archive
Off
Problem Statement
The CSS system is currently out of sync with the REC legal drafting for the retry strategy.
Stages Selection
Switching Data Management v1.2 CSS Retry Strategy Redlining.doc
R0203 - Change Proposal Form
R0203 - Change Report (Consultation) 17.09.2024
R0203 - Non-Confidential Consolidated Consultation Responses V1.0 (03.10.2024)
R0203 - Change Report (Final Recommendation - Approved) 15.10.2024
Company Name
-
Review status
Review required
C3-0093 - REC Service User Categorisation and Assessment
Date of latest update
Type
Change
ID
C3-0093
Urgent
No
Latest Update
-
Summary
Addition of new User Categories.
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RPS)
Review status
Review required
Performance Assurance Report Catalogue Updates (MHHS)
Date of latest update
Type
Change
ID
R0202
Change Category
Change Path
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the REC Release on 27 June 2025.
Summary
This change seeks to update the Performance Assurance Reporting Catalogue (PARC) to capture data items required to continue to appropriately monitor Retail Risks under Market-wide Half Hourly Settlement (MHHS) industry arrangements. Some housekeeping changes, for the PARC, have also been included in this change.
Change Plan
Proposal Plan approved
Completed
Start:
08 Aug 2024Due:
03 Sep 2024Completion:
03 Sep 2024Party impact assessment completed
Completed
Start:
03 Sep 2024Due:
04 Oct 2024Completion:
04 Oct 2024Change Report approved for Consultation
Completed
Start:
04 Oct 2024Due:
25 Mar 2025Completion:
25 Mar 2025Consultation completed
Completed
Start:
25 Mar 2025Due:
15 Apr 2025Completion:
15 Apr 2025RECPAB Voting
In Progress
Start:
15 Apr 2025Due:
29 Apr 2025Completion:
Status
Implementation Date
27 June 2025
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
03 RECPAB_24_0827_04E Draft changes to the PARC for MHHS (27.08.2024)
Archive
Off
Document title
R0202 RECPAB_23_PARC V5.2 - REDLINE MHHS - MEM only (18.03.2025)
Archive
Off
Document title
R0202 RECPAB_23_PARC V5.2 - REDLINE MHHS - MEM only APPROVED 29.04.2025
Archive
Off
Problem Statement
The PARC currently does not capture all the data items required to support the monitoring of Retail Risks following Market-wide Half Hourly Settlement go-live. An update to the PARC is required to include the data items that will ensure the Code Manager can provide the assurance the industry requires during transition and under the new MHHS arrangements.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
beth.brown@capgemini.com
SME Role
Lead Assurance Analyst
SME User
awaghorn@deloitte.co.uk
RECPAB_23_Performance Assurance Report Catalogue V5.2 - REDLINE.xlsx
R0202 - PARC Updates (MHHS) (CP Form)
R0202 Change Proposal Re-Plan v1.0 31.10.24
R0202 Change Report (Proposal Plan) v2.0 (Approved) 03.09.2024
R0202 Change Proposal Re-Plan V2.0 (Approved) 20.03.2025
R0202 Change Report (Consultation) v1.0 (Approved) 25.03.2025
R0202 Consolidated Consultation Responses V1.1 (22.04.2025)
R0202 Change Report (Final Recommendation) (Post-Vote) v2.0
Company Name
-
Review status
Review required
Performance Assurance Methodology and Techniques
Date of latest update
Type
Change
ID
C3-0092
Urgent
No
Latest Update
-
Summary
1. Updated to acknowledge PAB’s role in relation to the updates to the change process. 2. General housekeeping changes.
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RPA)
Review status
Review required
Changes to Metering Expert Panel Terms of Reference to support alternate R0170 solution
Date of latest update
Type
Change
ID
C3-0091
Urgent
No
Latest Update
-
Summary
This change puts the STIRG document under bespoke voting arrangements, where unanimous approval is required from the Network Operator and Metering Equipment Manager (MEM) representatives that are directly affected by the document (e.g. the DNO and electricity MEM). This puts the document back under very similar arrangements as it was under MOCoPA, which all Parties agree worked. Version 2 of the legal text is now available with adjusts made from the previous consultation.
Status
Implementation Status
Date Raised
Date of Update to Priority
Stages Selection
Company Name
Code Manager (RPS)
Review status
Review required
Creation of a Tool to Manually Correct ERDS / CSS Discrepancies
Date of latest update
Type
Change
ID
R0201
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal was implemented on 27 March 2026.
Summary
There is currently a tool utilised by DNOs to manually correct registration data to align the Registered Supplier in ERDS with the data held in CSS. The Market-Wide Half Hourly Settlement (MHHS) Design does not allow for retrospective amendment of Supplier Registration i.e. there is no equivalent tool for manual correction post MHHS go live (M10). Therefore, post MHHS implementation, any issues which prevent CSS data being reflected in ERDS cannot be corrected. This will prevent the Supplier from appointing agents and will lead to errors in settlement data under the BSC. A change is required to address this.
Change Plan
Change Issue Group
Completed
Start:
01 Aug 2024Due:
01 Aug 2024Completion:
01 Aug 2024Proposal Plan Approval
Completed
Start:
01 Aug 2024Due:
03 Sep 2024Completion:
03 Sep 2024Status
Implementation Date
27 March 2026
| Included changes | Affected REC Items | |
|---|---|---|
| R0100 | Update to Error Handling Documents |
Documents
| Name | Version | Last updated | Actions |
|---|---|---|---|
| 1.0 | 23 Jun 2026 |
|
|
| 1.0 | 08 Jun 2026 |
|
Download
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Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
Indicative PARC extract for R0201
Archive
Off
Document title
Solution Development Report published for Impact Assessment
Archive
Off
Document title
Legal Text published for Impact Assessment
Archive
Off
Document title
R0201 - Solution Development Report 270824
Archive
Off
Problem Statement
There are instances where ERDS (and SMRS under BSC governance) can be misaligned with the CSS and under the MHHS arrangements there is no mechanism for manual correction which there is in place today. From MHHS go live the Supplier will not be able to appoint their preferred agents. This issue only applies to MHHS Migrated Metering Points as the existing mechanism for manually correcting data would be used if the issue related to a non-migrated Metering Point. In the event that the Supplier cannot appoint its agents, this may prevent the Supplier from accurately billing the Consumer. The potential impact will increase as MHHS Migration continues, with more MHHS Metering Points potentially impacted by any CSS / ERDS discrepancy.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME Role
Lead Assurance Analyst
SME User
vaishnsharma@deloitte.co.uk
CP Form - CSS ERDS Discrepancy
R0201 Change Proposal Re-Plan V2.0 Approved
Change Proposal Re-Plan V3.0 Approved
Change Report for Impact Assessment
RECCo Overview Slides - CSS and ERDS Discrepancies
R0201 Change Report Proposal Plan V2.0 (Approved) 03.09.2024
R0201 - Change Proposal Re-Plan v1.0 (Approved) 15.10.2024
R0201 Consolidated Impact Assessment Responses (Public)
R0201 Change Report (Consultation) v1.0 12.08.2025
R0201 Consolidated Consultation Responses V1.0
R0201 Change Proposal Re-plan V4.0
Company Name
-
Review status
Review required
Review of the REC's Address Management Service
Date of latest update
Type
Issue
ID
I0200
Change Category
Change Path
Priority
Urgent
No
Latest Update
13/05/2026 - The REC Code Manager is establishing a new REC working group to support the progression of I0200 – Review of the REC’s Address Management Service. If you would like to attend the I0200 Working Group, please register your interest by contacting the Code Manager at change.management@recmanager.co.uk. The first meeting will take place in June 2026, with the exact date and time to be confirmed in due course and communicated via the REC Change Bulletin and via email to all those who register their interest.
Summary
Having the incorrect address can lead to a range of Consumer issues, including switching, billing and meter reading problems. The Meter Point Location (MPL) and Retail Energy Location (REL) have been added to the Code to resolve this issue. Whilst there had been progress resolving address data issues, there is not currently a mechanism to establish Code level targets for address improvement, resulting in around 2.8 million unmatched addresses.
Impacted Consumers
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Status
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Problem Statement
There has been progress resolving address data issues, but there is no mechanism to clearly establish Code level targets for address improvement, or overall market performance.
Stages Selection
Stages Selection
SME
SME Role
Lead Assurance Analyst
SME User
amoden@deloitte.co.uk
I0200 - Improving Address Management Targets (Issue Form)
I0200 - Change Issues Group paper
I0200 - Change Report (Proposal Plan) V1.1 (Approved) 18.02.2025
I0200 - Update to Plan (Pre Approval) 14.04.2026
Company Name
REC Code Manager
Review status
Review required
Review of Metering Asset data transferred from MAMs to the CDSP
Date of latest update
Type
Issue
ID
I0196
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
02/09/2026 - Update to plan published ahead of review at the REC Metering Expert Panel on 09 September 2026.
Summary
It has emerged that a high proportion of gas Data Items contain mismatches when comparing between Metering Asset Managers (MAM), Gas Suppliers, and the Central Data Service Provider. This Issue seeks to explore this issue and identify mechanisms by which these mismatches may be resolved.
Impacted Consumers
Impacted REC Documents
Impacted REC Parties and Market Participants
Status
Status
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Problem Statement
Work conducted by RPA has identified a significant number of mismatches between gas Data Items held by key stakeholders. This may result in Consumer detriment, as information relevant to an MPRN may not be held accurately by any given Party. As such, there is a need to review processes pertaining to the communication of gas data by MAMs onward to the CDSP to mitigate the potential for mismatches.
Stages Selection
Stages Selection
SME
SME Role
Lead Technical Analyst
SME Role
Lead Assurance Analyst
SME User
vaishnsharma@deloitte.co.uk
I0196 Issue Proposal Form (Word)
I0196 Issue Proposal Form (PDF)
I0196 Change Report (Plan) (Approved) V2.0 07.05.25
I0196 Change Re-Plan (Approved) V1.0 02.05.25
Company Name
-
Review status
Review required
Introducing a Process to Provide Updates During Fault Resolutions
Date of latest update
Type
Issue
ID
I0197
Change Category
Other Industry Codes impacted
Priority
Urgent
No
Latest Update
10/06/2026 - The Code Manager, following an approval to an Update to Plan by the REC Metering Expert Panel, has placed I0197 on hold.
Summary
Some customers have had faulty meters for a prolonged period, which impacts billing and settlement, and can prevent customers accessing specific tariffs. Currently the REC only has obligations relating to electricity meter faults, and these do not actually require work to be done to address faults. This issues proposes the introduction a maximum timeframe Fault Resolution deadline to resolve issues around faulty meters.
Impacted Consumers
Impacted REC Documents
Impacted REC Parties and Market Participants
Status
Status
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Problem Statement
Consumers have had faulty meters for a prolonged period, which impacts billing and settlement, and can prevent customers accessing specific tariffs.
Stages Selection
Stages Selection
SME
SME Role
Lead Assurance Analyst
SME User
vaishnsharma@deloitte.co.uk
I0197 - Change Proposal Form
I0197 - Change Report (Proposal Plan) V1.0 (Approved) 03.06.2025
I0197 - Update to Plan V3.0 (On Hold) 03.06.2026
Company Name
-
Review status
Review required
Metering Asset Manager (MAM) Communication Method Register
Date of latest update
Type
Change
ID
R0198
Change Category
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the February 2026 REC Release.
Summary
Studies conducted by the REC Performance Assurance (RPA) function of the REC Code Manager have concluded that gas market data fidelity may be improved by reducing the frequency of missed messages between Metering Asset Managers and other REC Parties. This Issue seeks to explore mechanisms by which a reduction in the number of permissible communication methods used by MAMs could support the data quality improvement objective.
Impacted Consumers
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Date
27 February 2026
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
I0198 - Draft Schedule 14 - Metering Operations & Draft Communications Method Register
Archive
Off
Document title
R0198 - Draft Schedule 14 - Metering Operations & Draft Communications Method Register V2.0
Archive
Off
Problem Statement
MAMs communicate with each other, and with other parties, using up to three possible methods as they send Market Messages in line with their obligations in the REC. It has been suggested that moving to a single communication method might help mitigate gas data quality issues. This Issue seeks to explore an interim solution to facilitate this.
Stages Selection
SME
SME Role
Lead Assurance Analyst
SME User
beth.brown@capgemini.com
SME Role
Lead Assurance Analyst
SME User
vaishnsharma@deloitte.co.uk
I0198 Change Proposal (pdf)
I0198 Change Report (Plan) (Approved) V2.0 03.04.2
I0198 Change Proposal Re-Plan V1.0 28.03.25
I0198 Change Report (IA) V1.0 03.04.25
R0198 Consolidated IA Responses V1.0 Non-Confidential
R0198 Change Report (Consultation) V1.0 11.06.25
R0198 Change Proposal Re-Plan V2.0 02.07.25
Change Report (Consultation) V2.0 11.07.25
R0198 Consolidated Consultation Responses V1.0 06.08.25
R0198 Change Report (Final Recommendation: Pre-Vote) V1.1 13.08.25
R0198 Change Report (Final Reccomendation - Post-Vote) V1.0 13.08.25
Company Name
-
Review status
Review required