Skip to main content
Statutory guidance

Capacity Market Rules

The Capacity Market Rules provide the detail for implementing the operating framework set out in regulations.

Updates to this page

From:
Department for Energy Security and Net Zero
Published:
1 August 2014
Last updated:
27 July 2026
Show all updates

  1. Published the Informal consolidation of Capacity Market Rules July 2026.

  2. Published the Capacity Market (Amendment) (No.3) and (No. 4) Rules 2026.

  3. Published the Capacity Market (Amendment) (No.2) Rules 2026.

  4. Published Capacity Market (Amendment) Rules 2026.

  5. Added The Capacity Market (Amendment) (No. 3) Rules 2025.

  6. Added Capacity Market (Amendment) (No. 2) Rules 2025.

  7. Published 'Capacity Market Rules frequently asked questions' for 2025.

  8. Published Informal Consolidation of Capacity Market Rules June 2025.

  9. Published Capacity Market (Amendment) Rules 2025.

  10. Added a link to Capacity Market (Amendment) (No.2) Rules 2024.

  11. Added Capacity Market (Amendment) (No.3) Rules 2024.

  12. Added Informal Consolidation of Capacity Market Rules July 2024.

  13. Added Capacity Market (Amendment) Rules 2024.

  14. We have updated the Capacity Market frequently asked questions document, adding questions 11-13 to clarify changes made to the Capacity Market in July 2023.

  15. We have published the Capacity Market (Amendment) Rules 2023 and the Informal Consolidation of Capacity Market Rules July 2023.

  16. We have published the Informal Consolidation of Capacity Market Rules 2022.

  17. Capacity Market (Amendment) (No. 2) Rules 2022 published.

  18. We identified the following errors in the Informal Consolidation of Capacity Market Rules 2021 and the accompanying Keeling Schedule and have published corrected versions: in Schedule 9 several conversion factors had been copied into the adjacent Emission Factor column; minor inconsistencies in the Table of Contents for each document. Please ensure you are referring to the updated versions.

  19. The Capacity Market (Amendment) (No.2) Rules 2021, Informal Consolidation of Capacity Market Rules July 2021, and Keeling Schedule for Capacity Market Rules July (Coronavirus Modifications) added.

  20. The Capacity Market (Amendment) Rules 2021 added.

  21. The Capacity Market (Amendment) (No. 3) Rules 2020 added.

  22. Added Informal consolidation of Capacity Market Rules July 2020.

  23. Capacity Market (Amendment) (No.2) Rules 2020 added.

  24. Capacity Market (Amendment) Rules 2020 added, CM Rules 2014 Keeling schedule (Upcoming Auctions) updated.

  25. We've added the informal consolidation of Capacity Market Rules (July 2019) and 3 Keeling schedule documents for the Capacity Market Rules 2014.

  26. We’ve added the Capacity Market (Amendment) (No. 5) Rules 2019 as a result of them being signed in Parliament on 17 July 2019.

  27. We've added the Capacity Market (Amendment) (No.4) Rules 2019 and removed: Keeling Schedule (Tranche 1) and Keeling Schedule (Tranche 2) as further amendments to the Capacity Market Rules supersede the changes outlined in these schedules.

  28. The Capacity Market (Amendment) (No. 3) Rules 2019 added.

  29. Keeling Schedules for Capacity Market (Amendment) Rules 2019 (Tranches 1 and 2) added.

  30. The Capacity Market (Amendment) (No. 2) Rules 2019 added.

  31. Capacity Market Rules 2019 published

  32. Capacity Market (Amendment) (No. 4) Rules 2017.

  33. Capacity Market (Amendment) (No. 3) Rules 2017 published

  34. Updated FAQ's.

  35. Informal consolidation of Capacity Market Rules July 2017 published.

  36. Added 'Capacity Market (Amendment) Rules 2017', 'Capacity Market (Amendment) (No 2) Rules 2017' and 'Capacity Market (Amendment) (No. 2) Rules 2015'.

  37. Updated FAQ's.

  38. Updated Capacity Market FAQ's.

  39. Capacity Market Rules frequently asked questions.

  40. Capacity market rules and regulations.

  41. Revised Capacity Market Rules.

  42. Draft Capacity Market (Amendment) Rules 2015

  43. Capacity Market (Amendment No.2) Rules 2014

  44. Addition of CM guidance doc

  45. Capacity Market (Amendment) rules published.

  46. First published.

Documents

Informal consolidation of Capacity Market Rules July 2026

PDF, 2.83 MB, 474 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules June 2025

PDF, 2.79 MB, 374 pages

Informal consolidation of Capacity Market Rules July 2024

PDF, 2.93 MB, 389 pages

Informal consolidation of Capacity Market Rules July 2023

PDF, 2.34 MB, 369 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules August 2022

PDF, 2.31 MB, 368 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules July 2021 (updated 16 September 2021)

PDF, 3.16 MB, 374 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules July 2020

PDF, 4.19 MB, 353 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules July 2019

PDF, 2.43 MB, 314 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules July 2017

PDF, 1.99 MB, 253 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Informal consolidation of Capacity Market Rules July 2016

PDF, 2.05 MB, 244 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No.4) Rules 2026

PDF, 391 KB, 45 pages

Capacity Market (Amendment) (No.3) Rules 2026

PDF, 991 KB, 119 pages

Capacity Market (Amendment) (No.2) Rules 2026

PDF, 296 KB, 17 pages

Capacity Market (Amendment) Rules 2026

Unnumbered act paper

PDF, 142 KB, 5 pages

Order a copy

Capacity Market (Amendment) (No. 3) Rules 2025

Unnumbered act paper

PDF, 181 KB, 7 pages

Order a copy

Capacity Market (Amendment) (No. 2) Rules 2025

Unnumbered act paper

PDF, 231 KB, 10 pages

Order a copy

Capacity Market (Amendment) Rules 2025

Unnumbered act paper

PDF, 312 KB, 31 pages

Order a copy

Capacity Market (Amendment) (No.3) Rules 2024

Unnumbered act paper

PDF, 457 KB, 41 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No.2) Rules 2024 (link to Ofgem document)

Unnumbered act paper

https://www.ofgem.gov.uk/sites/default/files/2025-03/The-Capacity-Market-%28Amendment%29-Rules-%28No.%202%29-2024.pdf

Order a copy

Capacity Market (Amendment) Rules 2024

Unnumbered act paper

PDF, 166 KB, 14 pages

Order a copy

Capacity Market (Amendment) Rules 2023

Unnumbered act paper

PDF, 173 KB, 9 pages

Order a copy

Capacity Market (Amendment) (No. 2) Rules 2022

Unnumbered act paper

PDF, 148 KB, 8 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

The Capacity Market (Amendment) Rules 2022

Unnumbered act paper

PDF, 125 KB, 9 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

The Capacity Market (Amendment) (No.2) Rules 2021

Unnumbered act paper

PDF, 185 KB, 11 pages

Order a copy

The Capacity Market (Amendment) Rules 2021

Unnumbered act paper

PDF, 603 KB, 62 pages

Order a copy

The Capacity Market (Amendment) (No. 3) Rules 2020

Unnumbered act paper

PDF, 261 KB, 6 pages

Order a copy

The Capacity Market (Amendment) (No. 2) Rules 2020

Unnumbered act paper

PDF, 999 KB, 67 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

The Capacity Market (Amendment) Rules 2020

Unnumbered act paper

PDF, 180 KB, 7 pages

Order a copy

The Capacity Market (Amendment) (No. 5) Rules 2019

Unnumbered act paper

PDF, 252 KB, 23 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

The Capacity Market (Amendment) (No. 4) Rules 2019

Unnumbered act paper

PDF, 166 KB, 14 pages

Order a copy

The Capacity Market (Amendment) (No. 3) Rules 2019

Unnumbered act paper

PDF, 127 KB, 10 pages

Order a copy

The Capacity Market (Amendment) (No. 2) Rules 2019

Unnumbered act paper

PDF, 458 KB, 54 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) Rules 2019

Unnumbered act paper

PDF, 159 KB, 10 pages

Order a copy

Capacity Market (Amendment) (No. 4) Rules 2017

Unnumbered act paper

PDF, 264 KB, 33 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No. 3) Rules 2017

Unnumbered act paper

PDF, 147 KB, 10 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No.2) Rules 2017

Unnumbered act paper

PDF, 127 KB, 19 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) Rules 2017

Unnumbered act paper

PDF, 1.97 MB, 256 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

The Capacity Market (Amendment) (No.3) Rules 2016

Unnumbered act paper

PDF, 257 KB, 10 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No.2) Rules 2016 [Ofgem]

Unnumbered act paper

PDF, 2.06 MB, 252 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) Rules 2016

Unnumbered act paper

PDF, 221 KB, 36 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) (No. 2) Rules 2015

Unnumbered act paper

PDF, 1.56 MB, 230 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment) Rules 2015

Unnumbered act paper

PDF, 17.7 MB, 86 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment)(No.2) Rules 2014

Unnumbered act paper

PDF, 437 KB, 4 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market (Amendment)(No.1) Rules 2014

Unnumbered act paper

PDF, 1010 KB, 6 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market Rules

Unnumbered act paper

PDF, 1.44 MB, 151 pages

Order a copy

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Guidance Document - Energy UK list

PDF, 418 KB, 13 pages

This file may not be suitable for users of assistive technology.

Request an accessible format
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alt.formats@energysecurity.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Capacity Market Rules frequently asked questions (2025)

PDF, 242 KB, 12 pages

Capacity Market Rules frequently asked questions (2023)

PDF, 256 KB, 13 pages

Details

The informal consolidation is for information only and should not be relied upon as a definitive statement of the Capacity Market Rules.

The rules provide the detail for implementing the operating framework set out in regulations. This means that the rules focus on the technical and administrative rules and procedures for how the Capacity Market operates and includes matters such as procedures relating to the day-to-day running of the Capacity Market, the process by which capacity providers pre-qualify, and rules for running capacity auctions and issuing capacity agreements to successful bidders.

Ofgem also have responsibility for managing and making any changes to the Capacity Market Rules. Ofgem Rule amendments are reproduced on this page, but these remain the responsibility of Ofgem. Any version on the Ofgem website should be considered the most up to date version.

More information on the Capacity Market

See the Capacity Market appeals process guidance.

Sign up for emails or print this page

Related content