Code Releases

About Code Releases

Browse the latest, upcoming and past REC code releases. For each release, view included changes, see which REC items are affected, and download official release documents.

27 March 2026

Status Live

EMAR Version 27.03.2026_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

Documents

Name	Version	Last updated	Actions
MPD Change Guidance Notes 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Proposal Form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

26 June 2026

Status Live

EMAR Version 26.06.2026_live

Included changes		Affected REC Items
R0103	Central provision of DCC Technical Contacts for requesting test certificates	Schedule 25 - Central Switching Service

Version 4.2.0 - 27 Mar 2027.

Status Scheduled

EMAR Version 4.1.0_Live

Included changes		Affected REC Items
R0002	Review of Data Specification Category in REC Baseline Statement
R0136	Change to REC Schedule 22 Market Stabilisation Charge (MSC)

Documents

Name	Version	Last updated	Actions
mpd-change-proposal-form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

Version 4.2.1 - 02 Apr 2027.

Status Scheduled

EMAR Version 4.1.1_Dev

Included changes		Affected REC Items
R0001	Amendment to DCC Service Flag (DI51130) Data Item
R0100	Update to Error Handling Documents
R0126	SDEP Review Improvements (6) – SDEP User Guide and Obligations

Documents

Name	Version	Last updated
MPD Change Proposal Form 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Guidance Notes 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Proposal Form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

01 April 2025

Status Live

EMAR Version 01.04.2025_live

Included changes		Affected REC Items
R0101	Revision of the Implementation Date and approved solution for R0021	Schedule 1 - Interpretations and Definitions Schedule 14 - Metering Operations Schedule 15 - Metering Accreditation

23 August 2024

Status Live

EMAR Version 23.08.2024_live

Included changes		Affected REC Items
R0103	Central provision of DCC Technical Contacts for requesting test certificates	Schedule 25 - Central Switching Service

19 July 2024

Status Live

EMAR Version 19.07.2024_live

Included changes		Affected REC Items
R0001	Amendment to DCC Service Flag (DI51130) Data Item

10 May 2024

Status Live

EMAR Version 10.05.2024_live

Included changes		Affected REC Items
R0003	Market-wide Half-Hourly Settlement Implementation

12 April 2024

Status Live

EMAR Version 12.04.2024_live

Included changes		Affected REC Items
R0105	Review of ONAGE SLAs	Schedule 14 - Metering Operations

23 February 2024

Status Live

EMAR Version 23.02.2024_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

01 April 2023

Status Live

EMAR Version 01.04.2023_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

24 February 2023

Status Live

EMAR Version 24.02.2023_live

Included changes		Affected REC Items
R0130	Updates to the Data Access Matrix	Schedule 12 - Data Access

01 June 2022

Status Live

EMAR Version 01.06.2022_live

Included changes		Affected REC Items
R0102	Revision of the approved solution for R0032

14 April 2022

Status Live

EMAR Version 14.04.2022_live

Included changes		Affected REC Items
R0105	Review of ONAGE SLAs	Schedule 14 - Metering Operations

05 November 2027

Status Live

EMAR Version 05.11.2027_live

25 June 2027

Status Live

EMAR Version 25.06.2027_live

Version 5.0.0 - 01 April 2027

Status Live

EMAR Version 5.0.0

Included changes		Affected REC Items
R9999A	(Alt.) Introduction of Sweet Treat Reward System

Version 4.2.1 - 02 Apr 2027.

Status Scheduled

EMAR Version 4.1.1_Dev

Included changes		Affected REC Items
R0001	Amendment to DCC Service Flag (DI51130) Data Item
R0100	Update to Error Handling Documents
R0126	SDEP Review Improvements (6) – SDEP User Guide and Obligations

Documents

Name	Version	Last updated
MPD Change Proposal Form 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Guidance Notes 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Proposal Form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

Version 4.2.0 - 27 Mar 2027.

Status Scheduled

EMAR Version 4.1.0_Live

Included changes		Affected REC Items
R0002	Review of Data Specification Category in REC Baseline Statement
R0136	Change to REC Schedule 22 Market Stabilisation Charge (MSC)

Documents

Name	Version	Last updated	Actions
mpd-change-proposal-form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

27 February 2027

Status Live

EMAR Version 27.02.2027_live

06 November 2026

Status Live

EMAR Version 06.11.2026_live

31 July 2026

Status Live

EMAR Version 31.07.2026_live

26 June 2026

Status Live

EMAR Version 26.06.2026_live

Included changes		Affected REC Items
R0103	Central provision of DCC Technical Contacts for requesting test certificates	Schedule 25 - Central Switching Service

27 March 2026

Status Live

EMAR Version 27.03.2026_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

Documents

Name	Version	Last updated	Actions
MPD Change Guidance Notes 317 bytes Version 1.0 - 23 Jun 2026 PDF - 317 bytes Download Copy link	1.0	23 Jun 2026
MPD Change Proposal Form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

27 February 2026

Status Live

EMAR Version 27.02.2026_live

07 November 2025

Status Live

EMAR Version 07.11.2025_live

Included changes		Affected REC Items
R0003	Market-wide Half-Hourly Settlement Implementation

27 June 2025

Status Live

EMAR Version 27.06.2025_live

01 April 2025

Status Live

EMAR Version 01.04.2025_live

Included changes		Affected REC Items
R0101	Revision of the Implementation Date and approved solution for R0021	Schedule 1 - Interpretations and Definitions Schedule 14 - Metering Operations Schedule 15 - Metering Accreditation

28 February 2025

Status Live

EMAR Version 28.02.2025_live

08 November 2024

Status Live

EMAR Version 08.11.2024_live

Included changes		Affected REC Items
R0105	Review of ONAGE SLAs	Schedule 14 - Metering Operations

06 September 2024

Status Live

EMAR Version 06.09.2024_live

Included changes		Affected REC Items
R0003	Market-wide Half-Hourly Settlement Implementation

23 August 2024

Status Live

EMAR Version 23.08.2024_live

Included changes		Affected REC Items
R0103	Central provision of DCC Technical Contacts for requesting test certificates	Schedule 25 - Central Switching Service

19 July 2024

Status Live

EMAR Version 19.07.2024_live

Included changes		Affected REC Items
R0001	Amendment to DCC Service Flag (DI51130) Data Item

28 June 2024

Status Live

EMAR Version 28.06.2024_live

10 May 2024

Status Live

EMAR Version 10.05.2024_live

Included changes		Affected REC Items
R0003	Market-wide Half-Hourly Settlement Implementation

12 April 2024

Status Live

EMAR Version 12.04.2024_live

Included changes		Affected REC Items
R0105	Review of ONAGE SLAs	Schedule 14 - Metering Operations

28 March 2024

Status Live

EMAR Version 28.03.2024_live

23 February 2024

Status Live

EMAR Version 23.02.2024_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

06 December 2023

Status Live

EMAR Version 06.12.2023_live

Included changes		Affected REC Items
R0106	Performance Assurance Report Catalogue V5.1

03 November 2023

Status Live

EMAR Version 03.11.2023_live

Included changes		Affected REC Items
R0104	Clarifying requirement for continuous billing following an Erroneous Switch

Documents

Name	Version	Last updated	Actions
mpd-change-guidance-notes.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026
mpd-change-proposal-form.pdf 317 bytes Version 1.0 - 08 Jun 2026 PDF - 317 bytes Download Copy link	1.0	08 Jun 2026

29 September 2023

Status Live

EMAR Version 29.09.2023_live

30 June 2023

Status Live

EMAR Version 30.06.2023_live

01 April 2023

Status Live

EMAR Version 01.04.2023_live

Included changes		Affected REC Items
R0100	Update to Error Handling Documents

24 February 2023

Status Live

EMAR Version 24.02.2023_live

Included changes		Affected REC Items
R0130	Updates to the Data Access Matrix	Schedule 12 - Data Access

04 November 2022

Status Live

EMAR Version 04.11.2022_live

Included changes		Affected REC Items
R0002	Review of Data Specification Category in REC Baseline Statement

Documents

Name	Version	Last updated	Actions
Prioritisation Matrix 241.04 KB Version 1.3 - 29 May 2026 XLSX - 241.04 KB Download Copy link	1.3	29 May 2026
Rec Code Roadmap 455.42 KB Version 1.3 - 29 May 2026 XLSX - 455.42 KB Download Copy link	1.3	29 May 2026

03 August 2022

Status Live

EMAR Version 03.08.2022_live

Included changes		Affected REC Items
R0103	Central provision of DCC Technical Contacts for requesting test certificates	Schedule 25 - Central Switching Service

18 July 2022

Status Live

EMAR Version 18.07.2022_live

30 June 2022

Status Live

EMAR Version 30.06.2022_live

01 June 2022

Status Live

EMAR Version 01.06.2022_live

Included changes		Affected REC Items
R0102	Revision of the approved solution for R0032

14 April 2022

Status Live

EMAR Version 14.04.2022_live

Included changes		Affected REC Items
R0105	Review of ONAGE SLAs	Schedule 14 - Metering Operations

31 January 2022

Status Live

EMAR Version 31.01.2022_live

04 November 2021

Status Live

EMAR Version 04.11.2021_live

Included changes		Affected REC Items
R0001	Amendment to DCC Service Flag (DI51130) Data Item

Documents

Name	Version	Last updated	Actions
Prioritisation Matrix 241.04 KB Version 1.3 - 29 May 2026 XLSX - 241.04 KB Download Copy link	1.3	29 May 2026
Rec Code Roadmap 455.42 KB Version 1.3 - 29 May 2026 XLSX - 455.42 KB Download Copy link	1.3	29 May 2026

MHHS Programme Milestone M8 (Code changes delivered)

Status Live

EMAR Version _live