CSS End User Obligations
Date of latest update
Type
Change
ID
R0099
Change Category
Change Path
Priority
Urgent
No
Latest Update
07/02/25 - This Change Proposal has been withdrawn at the request of the proposer, as it is being developed as part of I0180
Summary
There are multiple observed instances of CSS incidents that have been raised that cannot be resolved without proactive engagement from the end user. There are currently no direct obligations on CSS Users to engage with the incident resolution process, or to provide up to date contact details, which can result in the CSS System Operator struggling to resolve incidents in a timely manner. This results in CSS incidents remaining unresolved and results in a degradation of the effectiveness of the switching process. This Change Proposal has been raised to address this issue.
Impacted Consumers
Impacted REC Services
Impacted REC Parties and Market Participants
Status
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 Document
Document title
R0099 Draft Legal Text v1.0 (20.03.2024)
Archive
Off
Stages Selection
SME
SME Role
Lead Technical Analyst
SME Role
Lead Assurance Analyst
R0099 - Change Proposal Form 10.03.2023
Company Name
-
Review status
Review required
Optional fuzzy searching in EES
Date of latest update
Type
Change
ID
R0098
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
This change seeks to introduce new configuration settings in to the EES API - to enable a search to be exact or fuzzy.
Change Plan
Service Provider Impact Assessment window start
Completed
Start:
07 Mar 2023Due:
09 Oct 2023Completion:
09 Oct 2023Service Provider Impact Assessment window close
Completed
Start:
09 Oct 2023Due:
27 Dec 2023Completion:
24 Nov 2024Party Impact Assessment start
Completed
Start:
27 Dec 2023Due:
12 Jan 2024Completion:
12 Jan 2024Party Impact Assessment close
Completed
Start:
12 Jan 2024Due:
02 Feb 2024Completion:
02 Feb 2024Preliminary Change Report and Consultation issued
Completed
Start:
02 Feb 2024Due:
16 Feb 2024Completion:
16 Feb 2024Consultation close
Completed
Start:
16 Feb 2024Due:
08 Mar 2024Completion:
08 Mar 2024Final Change Report issued
Completed
Start:
08 Mar 2024Due:
15 Mar 2024Completion:
15 Mar 2024Responsible Committee decision
Completed
Start:
15 Mar 2024Due:
27 Mar 2024Completion:
27 Mar 2024Appeal window closure
Completed
Start:
27 Mar 2024Due:
12 Apr 2024Completion:
12 Apr 2024Impacted Consumers
Impacted REC Services
Impacted REC Parties and Market Participants
Status
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
- As a Consumer, I want to be able to switch my electricity easily and efficiently.
- As an organisation providing switching services, I want Consumers to be able to search addresses efficiently.
Proposed Solution Document
Document title
EES Technical Requirement Specification v0.2
Archive
Off
Document title
EES API Interface Specification v3.1.6 - Redline
Archive
Off
Problem Statement
Where a Consumer initiates a Switch through a Supplier, PCW or TPI that utilises the EES API address searches can fail as the API only undertakes “fuzzy” matching. Address Search errors will then need to go through an exception handling process creating an inefficiency and producing a loss of confidence in the Switching process.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0098 - Change Proposal Form 08.03.2023
R0098 - Change Proposal Plan (Approved) 17.10.2023
R0098 - Initial Assessment Report (Approved) 17.10.2023
R0098 Consolidated Party IA Responses v1.0_Non Confidential (16.02.2024)
R0098 - Preliminary Change Report v1.0 published for consultation (16.02.2024)
R0098 - Consolidated Consultation Responses_Non Confidential (15.03.2024)
R0098 - Final Change Report v2.0 Post-Vote (27.03.2024)
Company Name
GB Group plc
Review status
Review required
CSS Message Regeneration Functionality
Date of latest update
Type
Change
ID
R0096
Change Category
Change Path
Priority
Urgent
No
Latest Update
25/02/2026 On 25 February 2026, the Technical Expert Panel voted in line with the Code Manager recommendation to approve R0096 for implementation in November 2027. The appeal window is now open until 23:59, 11 March 2026.
Summary
An inability by the Central Switching Service (CSS) to re-generate Market Messages that were not sent as intended can result in issues with the Switching process, both for REC Parties, and Consumers. This Change seeks to create a message regeneration functionality that would mitigate this Consumer detriment.
Change Plan
Update to Plan approved at Change Panel
Completed
Start:
Due:
Completion:
21 Oct 2025Impacted Consumers
Impacted REC Services
Status
Implementation Date
05 November 2027
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
R0096 Solution Development Document V1.0
Archive
Off
Document title
R0096 Detailed Design Document v1.0
Archive
Off
Problem Statement
Failures by the CSS to generate Market Messages can result in a breakdown of the Switching process. As the CSS cannot re-generate Market Messages that should have been sent but were not, this results in message asynchronisation, and breakdown of CSS functions and processes, resulting in substantial impacts for those involved – Difficulties for the REC Parties using the CSS, and difficulties for Consumers, where the Switch process is impacted.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
maxime.van-eyseren@capgemini.com
R0096 - Change Proposal Form downloadable version 17.02.2023
R0096 Change Report (Plan) (Approved) V1.0 21.01.25
R0096 Change Report Re-Plan (Pre-Approval) v1.0
R0096 Change Report (Re-Plan) v1.0 approved 21/10/2025
R0096 Change Report (Impact Assessment) v1.0
R0096 Consolidated Party Impact Assessment Responses v1.0
R0096 Change Report (Consultation) approved 17.12.2025 v1.2
R0096 Consolidated Consultation Responses v2.0
R0096 White Paper - Business Case Assessment v1.5
R0096 Change Report (Final Recommendation) approved 25.02.2026 v1.0
Company Name
REC Technical Services
Review status
Review required
Changes to allow DNOs to reinstate disconnected MPANs
Date of latest update
Type
Change
ID
R0095
Change Category
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
10/04/2026 - Change has been taken of hold. This change will be triggered for a reassessment for Code Manager Impact on 14/04/2026.
Summary
When Meter Point Administration Numbers (MPANs) are erroneously disconnected, they cannot be reinstated. As a result, Consumers suffer billing issues and Registered Suppliers cannot settle against the disconnected MPAN. This change seeks to introduce a mechanism to restore erroneously disconnected MPANs.
Impacted Consumers
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Consumer, I do not want the erroneous disconnection of my MPAN to affect the continuity of my supply contract and billing arrangements.
- As a DNO, I want to be able to reverse erroneous disconnections with no lasting effect so that I don’t need to create a new MPAN to resolve the issue, thereby avoiding DUoS payment collection issues. 2 - As a Supplier, I want to be able to reverse erroneous disconnections with no lasting effect so that I can correctly bill my consumers. 3 - As the CSS, I want users to be able to effectively resolve discrepancies, so that industry data for their portfolio is accurate. 4 - As MPRS, I want users to be able to effectively resolve discrepancies, so that industry data for their portfolio is accurate.
Problem Statement
When MPANs are incorrectly identified and targeted for disconnection, the RMP will be erroneously terminated following receipt of Termination Market Messages by the CSS. This process is irreversible once triggered, meaning that there is no mechanism to restore the MPAN as it was previously. This results in a poor Consumer experience, and settlement misbalancing for Registered Suppliers. Currently, there is no mechanism to mitigate the negative impact on Registered Suppliers/DNO and Consumers.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0095 - Change Proposal form downloadable version 17.02.2023
R0095 Change Proposal Plan v1.0 (Approved) - 20.09.23
R0095 Initial Assessment Report v1.0 (Approved) - 20.09.2023
R0095 - Change Proposal Re-Plan (Approved) v1.0-13.12.23
Company Name
-
Review status
Review required
Clarify obligations on gas meter exchanges that occur close to CoS
Date of latest update
Type
Change
ID
R0094
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
This change has been raised to address an issue with the 'Switch with a Concurrent Change of MEM process.'. MEMs are obliged to issue ONJOBs to the CDSP as part of a meter exchange. However, this would not be issued if the MEM has received a de-Appointment flow as part of the Switch. This change proposes to obligate MEMs to issue ONJOBs for any completed meter exchanges, even after receiving a de-Appointment flow. This will ensure accurate Meter Technical Details are available to the gaining Supplier and MEM.
Change Plan
Solution Development & Analysis
Completed
Start:
17 Feb 2023Due:
29 Mar 2024Completion:
27 Mar 2024Party Impact Assessment Due
Completed
Start:
29 Mar 2024Due:
19 Apr 2024Completion:
19 Apr 2024Preliminary Change Report Issued
Completed
Start:
19 Apr 2024Due:
26 Apr 2024Completion:
26 Apr 2024Responsible Committee Review
Completed
Start:
26 Apr 2024Due:
08 May 2024Completion:
08 May 2024Consultation Closes
Completed
Start:
08 May 2024Due:
31 May 2024Completion:
31 May 2024Final Change Report Issued
Completed
Start:
31 May 2024Due:
05 Jun 2024Completion:
05 Jun 2024Responsible Committee Decision
Completed
Start:
05 Jun 2024Due:
12 Jun 2024Completion:
12 Jun 2024Appeal Window Closure
Not Started
Start:
12 Jun 2024Due:
26 Jun 2024Completion:
Status
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
- As a Consumer, I want my Supplier to have accurate information about my meter, so that I do not experience billing problems following a Switch.
- As a MEM, I want to clearly understand my obligations relating to data transfer during a Switch, so that records of work I carry out are accurately recorded. 2 - As a Registered Supplier, I want metering data on my portfolio of Registrable Measurement Points to be accurate, so that Consumers do not experience billing problems or have a negative switch experience. 3 - As the CDSP, I want Change of Metering Asset data communicated with me to be timely and accurate, so that I am better able to fulfil my role and support REC Parties.
Proposed Solution Document
Document title
R0094 Draft Legal Text
Archive
Off
Document title
R0094 Solution - Draft Legal Text V1.1 05.06.24
Archive
Off
Problem Statement
When Metering Asset work is carried out concurrently with a Switch, details of the work undertaken may not be sent to industry by the MEM, resulting in inaccurate and out of date Metering Asset data being passed to the gaining Registered Gas Supplier.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
beth.brown@capgemini.com
SME Role
Lead Assurance Analyst
R0094 - Change Proposal Form downloadable version 17.02.2023
R0094 Change Proposal Plan v1.0 (Approved) 04-10-2023
R0094 Change Proposal Plan v2.0 (Approved) 01-03-2024
R0094 Initial Assessment Report v1.0 (Approved) 04-10-2023
R0094 Change Proposal Re-Plan (Approved) V1.0 01.03.24
R0094 Consolidated Impact Assessment Responses
R0094 Preliminary Change Report (Approved) V1.0 08.05.24
R0094 Consolidated Consultation Responses V1.0 05.06.24
R0094 Final Change Report (Post-Vote) V1.0 12.06.24
Company Name
-
Review status
Review required
Clarifications to the Theft Detection Incentive Scheme
Date of latest update
Type
Change
ID
R0091
Change Category
Change Path
Priority
Urgent
No
Latest Update
02/04/2023 - Change Proposal implemented on 01 April 2023
Summary
The Energy Theft Detection Incentive Scheme (TDIS) seeks to encourage Suppliers to undertake theft investigations. Following the completion of the first scheme year operated wholly under the REC, there have been several areas of the Code identified where additional clarity would benefit the administration of the TDIS.
Change Plan
Initial Assessment Report Issued
Completed
Start:
23 Jan 2023Due:
27 Jan 2023Completion:
27 Jan 2023Change Proposal Plan Issued
Completed
Start:
27 Jan 2023Due:
27 Jan 2023Completion:
27 Jan 2023Preliminary Change Report Issued
Completed
Start:
07 Feb 2023Due:
17 Feb 2023Completion:
17 Feb 2023Consultation Issued
Completed
Start:
17 Feb 2023Due:
17 Feb 2023Completion:
17 Feb 2023Responsible Committee Decision
Completed
Start:
17 Feb 2023Due:
24 Mar 2023Completion:
24 Mar 2023IAR and CPP Approval
Completed
Start:
27 Jan 2023Due:
07 Feb 2023Completion:
07 Feb 2023Impacted REC Documents
Impacted REC Parties and Market Participants
Status
Implementation Date
01 April 2023
| 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 an Energy Supplier, I need my TDIS obligations to be clear to ensure I can meet the requirements appropriately.
- As the Code Manager, I want all Suppliers to be clear on the required Energy Theft reporting so that the scheme can be effectively administered.
- As RECCo, I want to ensure that all Suppliers have clear obligations to ensure the effective administration of TDIS to support the Theft Reduction Strategy.
Proposed Solution Document
Document title
R0091 - Legal Text (as at IAR/CPP)
Archive
Off
Document title
R0091 - Legal Text at FCR 21.03.2023
Archive
Off
Document title
R0091 - Legal Text FINAL
Archive
Off
Document title
EMAR Link
Archive
Off
Problem Statement
To enable REC Parties and their agents to successfully meet the obligations of the TDIS, the REC needs to accurately reflect the intention of the requirements and current processes.
Stages Selection
R0091 - Change Proposal Form
R0091 - Change Proposal Plan (Approved) 07.02.2023
R0091 - Initial Assessment Report v1.0 (Approved) 07.02.2023
R0091 - Preliminary Change Report v1.0 17.02.2023
R0091 - Consolidated Consultation Responses
R0091 - Final Change Report v1.0 (Pre-Vote) 21.03.2023
R0091 - Final Change Report v2.0 (Post-Vote) 24.03.2023
Company Name
-
Review status
Review required
Alignment of Data Specification with Pre-REC Rules and Consequential Impacts on R0011 Legal Text
Date of latest update
Type
Change
ID
R0090
Change Category
Change Path
Priority
Urgent
No
Latest Update
30/06/2023 - This change was implemented on 30 June 2023 as part of the June 2023 REC Release
Summary
This Change Proposal seeks to address inconsistencies in the REC Data Specification to reflect pre-REC Data Transfer Catalogue (DTC) standards. This will also address consequential updates applied to the R0011 legal text.
Change Plan
Solution Development
Completed
Start:
23 Jan 2023Due:
23 Feb 2023Completion:
23 Feb 2023Party Impact Assessment Issued
Completed
Start:
23 Feb 2023Due:
24 Feb 2023Completion:
24 Feb 2023Preliminary Change Report Issued
Completed
Start:
24 Feb 2023Due:
27 Mar 2023Completion:
24 Mar 2023Consultation Issued
Completed
Start:
27 Mar 2023Due:
27 Mar 2023Completion:
24 Mar 2023Final Change Report Issued
Completed
Start:
27 Mar 2023Due:
19 Apr 2023Completion:
19 Apr 2023Responsible Committee Decision
Not Started
Start:
19 Apr 2023Due:
26 Apr 2023Completion:
Status
Implementation Date
30 June 2023
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Market Participant I want to have clarity on the format of Data Items within the Data Specification, so that my internal systems can be correctly configured to send and receive Data Items within Market Messages.
Proposed Solution Document
Document title
Final Legal Text.zip
Archive
Off
Problem Statement
The R0011 legal text contains inconsistencies with other Data Items that were last amended before the REC Data Specification came into effect. Such inconsistencies have potential to cause confusion to Parties implementing the R0011 legal text.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
rosalind.timperley
Summary of R0011 Impacted Data Specification
R0090 Change Proposal Plan v1.0 (Approved) 21.02.2023
R0090 Initial Assessment Report v1.0 (Approved) 21.02.2023
R0090 Preliminary Change Report v1.0 (Issued for Consultation) 24.03.2023
Summary of amendments to R0011 Legal Text 19.04.2023
R0090 Final Change Report v2.0 (Post-Vote) 26.04.2023
Company Name
-
Review status
Review required
Removal of Pre-COVID AQ Value from Data Access Matrix
Date of latest update
Type
Change
ID
R0089
Priority
Urgent
No
Latest Update
05/01/2024 - This change proposal has been withdrawn. Since the implementation of R0118 – Review of Schedule 12 and processes to manage access to data, the Gas Data Access Matrix has been made a Category 3 document and the removal of the Pre-COVID AQ value has been progressed through C3-0058 – Administrative Changes to align to the Data Permissions Matrix. C3-0058 is due for implementation on 26 January 2024. It will be open for adoption until 23:59 19 January 2024.
Summary
Empty
Status
Implementation Status
Date Raised
Date of Update to Priority
Solution Development
Stages Selection
Company Name
Xoserve
Review status
Review required
Make Shipper NExA values available on the GES portal
Date of latest update
Type
Change
ID
R0088
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
03/11/23 - This change was implemented on 03 November 2023 as part of the November 2023 REC Release
Summary
This Change Proposal seeks to deliver the consequential REC changes for Uniform Network Code (UNC) Modification 0701 Aligning Capacity Booking under the UNC and arrangements set out in relevant NExAs. Modification (MOD) 0701 will ensure that the daily capacity allowed by the Network Exit Agreement (NExA) and that permitted by the UNC are aligned.
Change Plan
Initial Assessment and Change Proposal Plan issued
Completed
Start:
16 Jan 2023Due:
24 Mar 2023Completion:
24 Mar 2023Initial Assessment Report and Change Plan approved
Completed
Start:
24 Mar 2023Due:
04 Apr 2023Completion:
04 Apr 2023Service Provider Impact Assessment
Completed
Start:
04 Apr 2023Due:
25 Apr 2023Completion:
24 Apr 2023Party Impact Assessment
Completed
Start:
25 Apr 2023Due:
31 May 2023Completion:
31 May 2023Preliminary Change Report published
Completed
Start:
31 May 2023Due:
16 Jun 2023Completion:
16 Jun 2023Consultation
Completed
Start:
16 Jun 2023Due:
21 Jul 2023Completion:
21 Jul 2023Final Change Report published
Completed
Start:
21 Jul 2023Due:
18 Aug 2023Completion:
18 Aug 2023Responsible Committee decision
Completed
Start:
18 Aug 2023Due:
30 Aug 2023Completion:
30 Aug 2023Impacted Consumers
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Date
03 November 2023
| Included changes | Affected REC Items | |
|---|---|---|
| R0104 | Clarifying requirement for continuous billing following an Erroneous Switch |
Documents
| Name | Version | Last updated | Actions |
|---|---|---|---|
| 1.0 | 08 Jun 2026 |
|
|
| 1.0 | 08 Jun 2026 |
|
Download
Copy link
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- As a Consumer, where I have entered a bi-lateral NExA with the relevant Transporter, I want my Shipper and Transporter to have access to all the data they need when capacity referrals to the Gas Transporters are required.
- As a Gas Transporter, I want the details of the NExA to be held in GES, to increase visibility of the existence of the NExA and to provide details of the offtake parameters.
- As a Gas Shipper, I need to understand both that a NExA exists, and that I have visibility of the offtake parameters relative to the site, so that I can ensure that I take the necessary actions to ensure the Consumer has the appropriate booked Supply Point Capacity.
Proposed Solution Document
Document title
R0088 Gas DAM v3.1 at FCR (18.08.2023)
Archive
Off
Problem Statement
XRN 5186 will make updates to the GES to implement the solution for UNC MOD 701. Following Ofgem’s decision to approve MOD 701, a REC Change Proposal is required to make changes to the REC DAM to enable the delivery of the full cross code solution.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0088 - Initial Assessment Report v1.0 (Approved) 04.04.2023
R0088 - Preliminary Change Report (Post-Vote) 28.06.2023
R0088 - Change Proposal Plan v1.0 (Approved) 04.04.2023
R0088 - Final Change Report v2.0 (Approved) 30.08.2023
R0088 - Final Change Report v1.0 (Pre-Vote) 18.08.2023
Company Name
Xoserve
Review status
Review required
MAP GES data access
Date of latest update
Type
Change
ID
R0087
Change Category
Change Path
Priority
Urgent
No
Latest Update
20/01/25 - Change Proposal withdrawn at proposers request.
Summary
As a MAP I want to be able to track my daily position of my portfolio. As a MAP I want to be able to track changes in my portfolio over time. As a MAP I want to understand who are using my assets and identify where assets are not being used
Impacted Consumers
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Status
Date Raised
Fuel
Date of Update to Priority
Solution Development
Stages Selection
Company Name
Correla
Review status
Review required