Review of Schedule 1 Interpretations and Definitions
Date of latest update
Type
Change
ID
R0291
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the June 2026 REC Release.
Summary
During the quality checks of REC Schedules for MHHS, several capitalised terms throughout schedules were identified with no entry in Schedule 1. It has also been identified that there are definitions that link to Schedules (such as 2, 20 and 21) which are no longer live REC Schedules. The Code Manager has reviewed these and determined some changes are required to Schedule 1.
Impacted REC Documents
Impacted REC Parties and Market Participants
Status
Status
Implementation Date
26 June 2026
| Included changes | Affected REC Items | |
|---|---|---|
| R0103 | Central provision of DCC Technical Contacts for requesting test certificates |
|
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
R0291 REC Main Body draft V0.1
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Document title
R0291 Schedule 1 draft V0.1
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Document title
R0291 Schedule 25 (CSS) draft V0.1
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Document title
R0291 Schedule 1 draft V0.2
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Document title
R0291 REC Main Body draft V0.1
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Document title
R0291 Schedule 25 (CSS) draft V0.1
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Problem Statement
Without clear definitions of all defined terms within the REC, there may be confusion for REC Parties and other industry participants who use REC documents.
Stages Selection
I0291 submission form
I0291 Change Report (Proposal Plan) V1.0
R0291 Change Report (For Consultation) V1.0
R0291 Consolidated Consultation Responses v1.0
R0291 Change Report (Final Recommendation) V1.1 approved 21.04.26
Company Name
-
Review status
Review required
Legacy Data Item API Service
Date of latest update
Type
Change
ID
R0290
Change Category
Change Path
Priority
Urgent
No
Latest Update
02/06/2026 - the REC Change Panel voted to reject the implementation of this Change Proposal, in line with the Code Manager recommendation. The appeal window closed on 17 June 2026.
Summary
MHHS removes certain Data Items (e.g. Profile Class, Measurement Class, Standard Settlement Configuration, Time Pattern Regime etc.) that are important to wider processes and products offered to consumers. This proposal is seeking a mechanism for electricity Market Participants to look up the previous entries for these legacy Data Items held before MHHS Migration begins.
Impacted REC Documents
Impacted REC Services
Impacted REC Parties and Market Participants
Status
Implementation Date
26 June 2026
| Included changes | Affected REC Items | |
|---|---|---|
| R0103 | Central provision of DCC Technical Contacts for requesting test certificates |
|
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
R0290 New Schedule Legacy Data Item API V0.4
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Off
Document title
R0290 Schedule 1 Defined Terms V0.2
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Off
Document title
R0290 Schedule 9 Qualification and Maintenance v0.1
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Off
Problem Statement
The risk of loss of certain Data Items for MHHS Migrated Metering Points may impact Parties in their ability to carry out and support industry processes, or in what products they are able to offer Consumers, in both the MHHS Market and following a Reverse Migration.
Stages Selection
SME
SME Role
Lead Technical Analyst
I0290 submission form
I0290 Change Report (Proposal Plan) V1.0
I0290 Extension to Plan V1.0 approved 27.03.26
I0290 Extension to Plan V2.0 approved 27.04.26
R0290 Change Report (For Consultation) v1.0
R0290 Consolidated Consultation Responses V1.0
Energy Consultants Association - letter on Change Report (Final Recommendation)
R0290 Change Report (Final Recommendation) v1.1 post vote 02.06.2026
Company Name
-
Review status
Review required
Clarification on Detailed Impact Assessment Activities
Date of latest update
Type
Change
ID
R0286
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the June 2026 REC Release.
Summary
The first complex technical change R0067 (Introduction of CSS Refresh Functionality) encountered a number of challenges within the design and implementation process, the change was scheduled for implementation on the 6th December 2023, however, the change was deployed with defects and was not fully operational until February 2024. Following that session, the Code Manager held discussions, and a formal Lessons Learned session with all Service Providers and identified a number of challenges with the technical change process. Some of these challenges can be attributed to the timing of the detailed design, Detailed Impact Assessments (DIA) and party impact assessments
Status
Status
Implementation Date
26 June 2026
| Included changes | Affected REC Items | |
|---|---|---|
| R0103 | Central provision of DCC Technical Contacts for requesting test certificates |
|
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed solution summary
- An update to the REC Schedule 5 - Change Management.
Proposed Solution Document
Document title
R0286 Proposed legal text v1.1
Archive
Off
Problem Statement
The technical change process currently creates five challenges which can be attributed to the timing of the detailed design, PIA and DIAs. These are as follows: Lack of Clarity, Limited Feedback, Misalignment, High Contingency Costs and Inaccurate Timelines.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME Role
Lead Assurance Analyst
Change Management v3.5 RedLine for IA Clarifications
I0286 submission form
R0286_Consolidated Consultation responses V1.0
Company Name
-
Review status
Review required
Organisations with multiple role types EES and SDEP access
Date of latest update
Type
Change
ID
I0285
Change Category
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
01/09/2026 - the Party impact assessment has closed. The Code Manager is reviewing responses and conducting the business case assessment.
Summary
It is currently not possible for organisations with multiple role types to have the same person be able to access all assigned role types within the Secure Data Exchange Portal (SDEP) without having a unique email address for each role type.
Change Plan
Change Report (Proposal Plan) approved by Change Panel
Completed
Start:
Due:
Completion:
04 Nov 2025Impacted 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
Proposed Solution Document
Document title
Zip file with I0285 legal text
Archive
Off
Document title
I0285 Solution Development Report V1.0
Archive
Off
Problem Statement
Organisations with more than one role type are required to have unique email addresses for staff who require access to multiple role types, leading to inefficiencies, unnecessary administrative burdens and a poor user experience.
Stages Selection
SME
SME Role
Lead Technical Analyst
I0285 submission form
I0285 Change Report (Proposal Plan) V1.0 approved 04.11.25
I0285 Extension to Plan V1.0 approved 25.02.26
I0285 Extension to Plan V2.0 approved 24.06.26
Company Name
-
Review status
Review required
Updates to Schedule 14 Measurement Transformers Commissioning Timescales
Date of latest update
Type
Change
ID
R0284
Change Category
Other Industry Codes impacted
Change Path
Priority
Urgent
No
Latest Update
12/08/2026 - the Metering Expert Panel approved the Change Report (Final Recommendation) V1.2. This Change Proposal will be implemented on 26 June 2027. If you wish to appeal this decision, this must be received by COB 28 August 2026.
Summary
The current timetables in REC Schedule 14 Metering Operations sections 15.6 and 30.6, where an Electricity Metering Asset requires commissioning in accordance with BSC Metering CoP 4 and the Measurement Transformers are owned by the DNO, or in 15.7 and 30.7 where the Measurement Transformers are not owned by the DNO, may no longer be fit for purpose post the implementation of MHHS Milestone M16, where the Settlement timetable reduces the RF run to 4 months.
Impacted REC Documents
Impacted REC Parties and Market Participants
Status
Status
Implementation Date
25 June 2027
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
I0284 Schedule 14 Metering Operations draft V0.2
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Off
Document title
R0284 Schedule 14 Metering Operations draft V0.3
Archive
Off
Document title
R0284 Schedule 14 Metering Operations final version
Archive
Off
Problem Statement
The current timetables in REC Schedule 14 Metering Operations sections 15.6 and 30.6, where an Electricity Metering Asset requires commissioning in accordance with BSC Metering CoP 4 and the Measurement Transformers are owned by the DNO, or in 15.7 and 30.7 where the Measurement Transformers are not owned by the DNO, may no longer be fit for purpose post the implementation of MHHS Milestone M16, where the Settlement timetable reduces the RF run to 4 months.
Stages Selection
I0284 submission form
I0284 Change Report (Proposal Plan) V1.0 approved 03.02.26
I0284 Change Issue Group paper v1.0
I0284 Consolidated Impact Assessment Responses PUBLIC v1.0
R0284 Change Report (For Consultation) V1.0 approved 08.04.26
R0284 Consolidated Consultation Responses PUBLIC v1.0
R0284 Change Report (Final Recommendation) V1.2 approved 12.08.26
Company Name
-
Review status
Review required
Return of Legacy Meters
Date of latest update
Type
Issue
ID
I0282
Change Path
Priority
Urgent
No
Latest Update
08/04/2026 - The Closure Report was presented to the REC Metering Expert Panel at their meeting on 08 April 2026. The Issue has now been classed as resolved.
Summary
The issue identified is that current arrangements require or assume that legacy Meter Asset Providers (MAPs) take back old, non Smart Meters once they are removed from Consumers’ Premises, even though many of these meters are obsolete, cannot be reused, and ultimately require disposal. This has resulted in large volumes of legacy meters being transported across the country between storage providers and legacy MAPs, creating unnecessary cost, administrative burden, and environmental impact. Storage providers are issuing extensive lists of Meter Serial Numbers (MSN) to try to establish meter ownership, and legacy MAPs must manually verify these details. This process has been made more difficult by historical changes in company names and ownership structures. Once ownership is confirmed, the meters are frequently transported to the legacy MAP only for them to arrange disposal, which provides no net value and simply adds further transportation and handling costs.
Impacted REC Parties and Market Participants
Status
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Problem Statement
The process for handling removed legacy non Smart Meters is inefficient and environmentally costly, with unclear ownership, unnecessary transport, and no established recycling route. A consistent, sustainable disposal solution is needed to reduce waste, simplify operations, and clarify the management of any scrap value.
Stages Selection
Stages Selection
I0282 submission form
I0282_Closure Report_v1.0 (26 March 2026)
Company Name
-
Review status
Review required
Extending R0067 Refresh Functionality
Date of latest update
Type
Issue
ID
I0281
Change Category
Change Path
Priority
Urgent
No
Latest Update
03/07/2026 - The Service Provider Impact Assessment is ongoing and expected to be completed by 07 August 2026.
Summary
CSS Market Messages sent by the Central Switching Service (CSS) to Switching Data Service Providers (SDSPs) are either not being received, being received after Gate Closure, or are being received out of the order that they were originally sent in. This Issue originally aimed to extend the Refresh functionality, implemented for the Gas Retail Data Agent (GRDA).to the Electricity Retail Data Agent (ERDA). Following solution development for I0281, it was agreed that the Refresh functionality would be made available for all Market Participants in receipt of the in-scope messages.
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
CSS messages are not received by the SDSPs in the order in which they were originally sent, or after Gate Closure, so it can be difficult to detect and often requires significant manual effort to resolve. This issue can directly impact Consumer switching experiences, causing disruption and possible delays in a switch.
Stages Selection
Stages Selection
SME
SME Role
Lead Technical Analyst
SME User
maxime.van-eyseren@capgemini.com
SME Role
Lead Assurance Analyst
SME User
amoden@deloitte.co.uk
I0281_Change Report (Update to Plan) v1.0 (Pre-approval)
I0281_Change Report (Update to Plan) v1.0 Approved 20.05.2026
Company Name
-
Review status
Review required
CSS Certificate Authority audit clarification
Date of latest update
Type
Change
ID
R0280
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the February 2026 REC Release.
Summary
CSS Certificate Authority Service Definition clause 9.1 states that the CSS CA Service will be audited each year by a third party against an approved compliance standard and or methodology. The clause however does not state who initiates the audit (i.e. RECCo, the Code Manager, Switching Operator etc.) and engages with the third party.
Change Plan
Proposal Plan approved at Change Panel
Completed
Start:
Due:
Completion:
21 Oct 2025Impacted REC Parties and Market Participants
Status
Implementation Date
27 February 2026
Implementation Status
Date Raised
REC Decision Maker
Date of Update to Priority
Solution Development
Proposed Solution Document
Document title
R0280 Legal Text approved 16.12.2025 v1.0
Archive
Off
Problem Statement
Section 9 of the CSS Certificate Authority Service Definition document mandates an annual third-party audit of the CSS Certificate Authority Service against an approved compliance standard or methodology. However, it does not specify the audit technique or methodology to be used, nor does it specify who is responsible for initiating the audit and engaging with the third-party.
Stages Selection
SME
SME Role
Lead Assurance Analyst
SME User
amoden@deloitte.co.uk
R0280 submission form
R0280 Change Report (Proposal Plan) v1.0 approved 21/10/2025
R0280 Change Report (For Consultation) v1.0
R0280 Consolidated Consultation Responses v1.0
R0280 Change Report (Final Recommendation) Approved 16.12.25 v1.0
Company Name
-
Review status
Review required
Housekeeping November 2025
Date of latest update
Type
Change
ID
R0279
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal was implemented as part of the 7 November 2025 REC Release.
Summary
The Code Manager has identified a number of non-material clarifications, typographical errors and changes needed to REC products.
Change Plan
Approved at Change Panel
Completed
Start:
Due:
Completion:
21 Oct 2025Status
Implementation Date
07 November 2025
| Included changes | Affected REC Items | |
|---|---|---|
| R0003 | Market-wide Half-Hourly Settlement Implementation |
Implementation Status
Date Raised
Fuel
REC Decision Maker
Date of Update to Priority
Solution Development
Problem Statement
This Housekeeping Change Proposal seeks to make typographical and formatting corrections that have been identified and improve consistency across the REC.
Stages Selection
November 2025 Housekeeping summary spreadsheet V1.0
November Housekeeping legal text (zip file) V1.0
R0279 Housekeeping Change Report V1.0 approved 21.10.25
Company Name
-
Review status
Review required
Data Latency SLA Alignment for Gas Enquiry Service
Date of latest update
Type
Change
ID
R0277
Change Category
Change Path
Priority
Urgent
No
Latest Update
This Change Proposal has been implemented as part of the February 2026 REC Release.
Summary
The current performance level for the processing of Data from CDSP is no longer fit for purpose and does not reflect the operational capability of the service. The performance level was originally conceived as part of the CSS programme in 2022 and operational reality has shown it is not required by industry. A revision of the performance level will align service performance metrics with system performance and deliver economic benefit.
Change Plan
Proposal Plan approved at Change Panel
Completed
Start:
Due:
Completion:
07 Oct 2025Impacted REC Services
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
R0277 Legal Text For Consultation
Archive
Off
Problem Statement
The current performance levels for the processing of data from CDSP is no longer fit for purpose and does not align with system or service performance. The CSDP is also not meeting these performance levels on a monthly basis. While there are no known issues on data latency raised by users, this change to clarify performance levels is needed for the GES reinstated contract and to ensure ongoing service delivery.
Stages Selection
SME
SME Role
Lead Technical Analyst
SME Role
Lead Assurance Analyst
I0277 submission form
I0277 Change Report (Proposal Plan) approved 07/10/2025
R0277 Change Report (For Consultation) v1.0
R0277 Change Report (Final Recommendation) Approved 26.11.25 v1.0
Company Name
-
Review status
Review required