Revision of the Implementation Date and approved solution for R0021
Date of latest update
Type
Change
ID
R0101
Change Category
Other Industry Codes impacted
Change Path
Priority
Urgent
Yes
Latest Update
30/06/2023 - This change was implemented on 30 June 2023 as part of the June 2023 REC Release
Summary
Updated 28 April 2023: Following discussions with DCUSA and Ofgem, this change has been amended to remove reference to deferral of R0021. The Change will focus on providing clarity on the proposed solution and Market Messages to be used when Safe Isolation Works are undertaken. The implementation approach has been amended to a Phased Implementation Approach between 30 June and 03 November 2023.
Change Plan
Solution Analysis and Development
Completed
Start:
23 Mar 2023Due:
31 Mar 2023Completion:
31 Mar 2023Responsible Committee Review Completed
Completed
Start:
31 Mar 2023Due:
27 Apr 2023Completion:
27 Apr 2023Consultation Started
Completed
Start:
27 Apr 2023Due:
28 Apr 2023Completion:
28 Apr 2023Consultation Ended
Completed
Start:
28 Apr 2023Due:
16 May 2023Completion:
16 May 2023Final Change Report Issued
Completed
Start:
16 May 2023Due:
19 May 2023Completion:
19 May 2023Responsible Committee Recommendation
Completed
Start:
19 May 2023Due:
26 May 2023Completion:
26 May 2023Impacted Consumers
Impacted REC Documents
Impacted REC Parties and Market Participants
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 premise owner I want to be able to contract with a Safe Isolator Provider (SIP), and for the SIP to be able to provide the service in a fully compliant manner.
- As a REC MEM who wants to operate as SIP, I need clarity on the solution and Market Message requirements when I provide Safe Isolation Works to Premise Owners. As a Registered Supplier, I need clarity on the solution and Market Message requirements when my consumers have Safe Isolation Works completed at their Premise Owners by SIPs.
- As a Distribution Network Operator, I need clarity on the solution and Market Message requirements when my connected parties have Safe Isolation Works completed at their Premise Owners by SIPs.
Proposed Solution Document
Document title
R0101 - Legal text changes for FCR - 19.05.2023
Archive
Off
Document title
FCR R0101 MM & Standards Definition v2.0
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Problem Statement
Updated: 28/04/2023. Following an implementation webinar for R0021 on 2 March, several matters were raised by Parties regarding the solution and the Market Messages that the Code Managers needs to address to ensure that the solution approved by Ofgem can be implemented successfully.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0101 Change Proposal Form (downloadable version) 23.03.2023
R0101 - Safe Isolation Provider Solution Overview - V5.0 19.5.2023
R0101 - Initial Assessment Report (approved) - v1.0 06.04.2023
R0101 - Change Proposal Plan - v3.0
R0101 Preliminary Change Report v2.0 (Approved) 28.04.2023
Phased Implementation Approach v1.0 28.04.2023
FAQ's Webinar 09 May 2023 v1.0
Non-Confidential Consolidated Consultation Responses v1.0 19.05.2023
R0101 - Draft Legal text for FCR v2.0 MM & Standards Definition
R0101 Final Change Report
Company Name
REC
Review status
Review required
Update to Error Handling Documents
Date of latest update
Type
Change
ID
R0100
Change Category
Change Path
Priority
Urgent
No
Latest Update
02/02/2024 - Draft red-lining under review with impacted Parties. Awaiting feedback prior to Change progression.
Summary
There are duplications between the CSS Message Business Data Validation Rules document (a Category 2 document) and the CSS Error Processing guide (a Category 3 guidance document), which is resulting in confusion and complications within the error handling process. This Change Proposal has been raised to update the Business Data Validation Rules document, to capture the appropriate information that is removed from the CSS Error Processing guide and to ensure alignment with newly created knowledge articles
Impacted Consumers
Status
Implementation Status
Date Raised
Fuel
Date of Update to Priority
Solution Development
Stages Selection
R0100 - Change Proposal Form 16.03.2023
Company Name
-
Review status
Review required
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
Consequential Change for CSS Smart Meter Data Retriever Appointments
Date of latest update
Type
Change
ID
R0097
Change Category
Change Path
Urgent
Yes
Latest Update
22/09/25 - This Change Proposal has been implemented as part of the MHHS M8 22 September 2025 REC Release.
Summary
This change looks to make amendments to the Data Specification for the Supplier Arranged Appointments messages exchanged between the Electricity Retail Data Service and Central Switching Service.
Change Plan
Service Provider Impact Assessment started
Completed
Start:
20 Feb 2023Due:
22 Mar 2023Completion:
22 Mar 2023Service Provider Impact Assessment completed
Completed
Start:
22 Mar 2023Due:
03 May 2023Completion:
03 May 2023Preliminary Change Report and Consultation issued
Completed
Start:
03 May 2023Due:
19 May 2023Completion:
19 May 2023Consultation closed
Completed
Start:
19 May 2023Due:
05 Jun 2023Completion:
05 Jun 2023Final Change Report issued
Completed
Start:
05 Jun 2023Due:
21 Jun 2023Completion:
15 Jun 2023Responsible Committee decision
Completed
Start:
21 Jun 2023Due:
28 Jun 2023Completion:
04 Jul 2023Appeal Window opens
Completed
Start:
28 Jun 2023Due:
04 Jul 2023Completion:
04 Jul 2023Appeal Window closes
Completed
Start:
04 Jul 2023Due:
18 Jul 2023Completion:
18 Jul 2023Impacted Consumers
Impacted REC Services
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 the CSS Provider, I want to be able to identify which appointment messages received from ERDS require a response, so that I can confirm whether the appointment was successfully made in SMDSP
- As the ERDS Provider, I want to be able to indicate which appointment messages I need to receive a response for, so that I can understand which appointments have been successful in the SMDSP
- As an Electricity Supplier, I want Supplier appointments in the ERDS to match those held in SMDSP
Proposed Solution Document
Document title
R0097 Proposed Solution (Initial Assessment) 14.03.23
Archive
Off
Document title
R0097 Proposed Solution (Impact Assessment) 22.03.23
Archive
Off
Document title
R0097 Proposed Solution (Consultation) 17.05.23
Archive
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Document title
R0097 Draft Legal Text (Consultation) 17.05.2023
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Problem Statement
The implementation of Change Proposal R0044, will result in the Central Switching Service (CSS) providing an asynchronous response to the Electricity Retail Data Service (ERDS) upon a successful, or unsuccessful Smart Meter Data Retriever (SMDR) appointment within the SMDSP. This will significantly increase the volume of CSS messages, as there is currently no mechanism for the CSS to recognise when a response is required. The increased volume could have a significant impact on central system performance.
Stages Selection
SME
SME Role
Lead Technical Analyst
R0097 - Change Proposal Form downloadable version 20.02.2023
R0097 - Change Proposal Plan v2.0 (Approved) 21.03.2023
R0097 - Initial Assessment Report v2.0 (Approved) 21.03.23
R0097 - Preliminary Change Report v1.0 (For Consultation) 19.05.2023
R0097 Consolidated Consultation Responses v1.0 PUBLIC 15.06.2023
R0097 - Final Change Report v2.0 (Post-Vote) 04.07.2023
Company Name
REC Technical Services
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
ERDS Upload File in the Data Specification and clarification of cancellation code
Date of latest update
Type
Change
ID
R0086
Priority
Urgent
No
Latest Update
06/11/2023 - Withdrawal adoption window closed.
Summary
The MPAS/ERDS Upload file has historically been a part of the Data Specification however during transition from the MRA, the process has been omitted. This change seeks to restore the file to the specification. Secondly, the file previously provided a cancellation reason code for Switches. Under the current REC arrangements (i.e. since CSS go live) Reason codes are not provided and have been defaulting to W which indicated a reason of “withdrawn” which may now be misleading. This Change Proposal has been raised to address these issues
Impacted Consumers
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Status
Date Raised
Date of Update to Priority
Solution Development
Stages Selection
R0086 - Change Proposal Form (downloadable version)
Company Name
-
Review status
Review required
Changes to Supply Number Format for MHHS (Alternative)
Date of latest update
Type
Change
ID
R0083A
Priority
Urgent
No
Latest Update
17/11/2023 - The Authority has rejected R0083A, but has approved R0083 for implementation on MHHS M8 *This Change Proposal is a consequential change from the Market-wide Half Hourly Settlement programme
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. This is an Alternative Change Proposal to R0083, which proposes to replace the format of the top line in the Supply Number Format. This Change Proposal proposes to remove the top line completely from the S Number format. Both solutions are being progressed together to allow for a clear assessment of the benefits and drawbacks and impacts to consumers.
Original CP
Impacted Consumers
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 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
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
R0083A - Change Proposal Form 05.12.2022
Decision to Reject Change Proposal R0083A - Change to Supply Number Format Alternate
Company Name
-
Review status
Review required
CSS Market Message Retry Strategy
Date of latest update
Type
Change
ID
R0081
Priority
Urgent
No
Latest Update
15/11/2023 - Change Proposal has been withdrawn. Market message success data for September 2023 was reviewed to ensure that a stable period was analysed which represented ‘normal’ conditions. Upon completion of the review, it has been concluded that the success of the current retry strategy has significantly improved since this change proposal was raised. The Code Manager will introduce cyclical reviews of performance to ensure this continues at the expected levels.
Summary
The prescriptive nature of the Market Message retry drafting is currently impeding on the CSS Service Provider’s ability to ensure all Market Messages are sent and received successfully between the CSS and the CSS User. This CP proposes a move to a principles-based obligation that allows for flexibility to ensure the CSS and CSS User are able to attempt retries but not have to follow specific timings or have a maximum number of retries.
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
R0081 - Change Proposal Form
Proposed legal text submitted with the CP
Company Name
-
Review status
Review required