C9 statements and consultations | National Energy System Operator

C9 statements and consultations | National Energy System Operator Show/Hide Menu Toggle Add to favourites Close tooltip Sign in to add this page to your favourites Sign in or register Show favourites Close Close tooltip Sign in or register to manage your favourites Sign in or register Help You are now signed in Visit My NESO account to view and manage your dataset subscriptions. Maybe later Go to your account C9 statements and consultations We are required to establish statements and guidelines in accordance with special condition C9 of the National Energy System Operator’s (NESO) Electricity System Operator (ESO) Licence. On this page, you will find all C9-related documents, including consultations. Please note: as a result of the licence changes arising from the transition to NESO, the statements previously found under C16 of the transmission licence are now found under C9 of the ESO Licence. The statements on this page currently refer to C16 as this was the correct licence condition at the time of consultation. The NTC commercial compensation methodology consultation documents have moved to What is an NTC? Join our C9 Mailing List To keep up to date with the latest C9 news and publications please sign up to the Balancing Services mailing list. Sign up to alerts Current statements and guidelines Previous statements and guidelines C9 Consultations Past C9 consultations Current statements and guidelines Here you can find the latest versions of C9-related statements including the Balancing Principles Statement Report and guidelines. Latest versions Latest versions Name Annual Balancing Services Spend Report April 2024 - March 2025 Procurement Guidelines Statement v28 effective from 2300 02 September 2025 Balancing Principles Statement v26 effective from 2300 02 September 2025 BSAD Methodology Statement v26 effective from 2300 02 September 2025 ABSVD Methodology Statement v20 effective from 2300 02 September 2025 SMAF Methodology Statement v19 effective from 2300 02 September 2025 NTC Spend Addendum to Annual Balancing Services Spend Report April 2021 - March 2022 Previous statements and guidelines Here you can find previous versions of C9-related statements and guidelines. Procurement Guidelines Balancing services adjustment data (BSAD) Balancing principles statement report System management action flagging System management action flagging (SMAF) report Applicable balancing services volume data (ABSVD) Balancing Principles Statement Spend Reports Procurement Guidelines Name Published Procurement Guidelines Statement v27 effective from 01 April 2025 1 Apr 2025 Procurement Guidelines Statement v26 effective from 04 October 2024 4 Oct 2024 Procurement Guidelines Statement v25 effective from 01 April 2024 28 Mar 2024 Procurement Guidelines Statement v24 effective from 02 November 2023 2 Nov 2023 Procurement Guidelines Statement v23.1 effective 01 April 2023 31 Mar 2023 Procurement Guidelines Statement v22 effective from 04 November 2022 16 Nov 2022 Balancing services adjustment data (BSAD) Name Published BSAD Methodology Statement v25 effective 01 April 2025 1 Apr 2025 BSAD Methodology Statement v22 effective from 04 November 2022 4 Nov 2022 Balancing principles statement report Rich text By accessing these reports, you are agreeing to our terms and conditions . Name Published Sort ascending Supplement to the Balancing Principles Statement Report 2019-20 6 Jul 2021 Balancing Principles Statement Report 2019-20 6 Jul 2021 Supplement to the Balancing Principles Statement Report 2019-20 5 Jul 2021 Balancing Principles Statement Report 2018-19 23 Oct 2020 Supplement to the Balancing Principles Statement Report 2018-19 14 Aug 2020 Balancing Principles Statement Report 2017-18 14 Aug 2020 Supplement to the Balancing Principles Statement Report 2017-18 16 May 2019 Supplement to the Balancing Principles Statement Report 2016-17 26 Feb 2019 Balancing Principles Statement Report 2016-17 31 May 2018 Balancing Principles Statement Report 2015-16 21 Jul 2017 System management action flagging Name Published SMAF Statement v18 effective from 01 April 2025 1 Apr 2025 SMAF Methodology Statement v15 effective from 24 October 2022 24 Oct 2022 System management action flagging (SMAF) report Name Published Sort ascending SMAF Flagging Accuracy Report 2024-25 6 Aug 2025 SMAF Flagging Accuracy Report 2023-24 15 Jul 2024 SMAF Flagging Accuracy Report 2022-23 12 Jul 2023 SMAF Flagging Accuracy Report 2021-22 6 Jan 2023 SMAF Flagging Accuracy Report 2020-21 9 Jun 2021 SMAF Flagging Accuracy Report 2019-20 27 May 2020 SMAF Flagging Accuracy Report 2018-19 21 May 2019 SMAF Flagging Accuracy Report 2017-18 6 Jun 2018 P217 Flagging Accuracy report - 2013-14 6 Sep 2017 SMAF Flagging Accuracy Report 2014-15 6 Sep 2017 Applicable balancing services volume data (ABSVD) Name Published ABSVD Methodology Statement v19 effective from 01 April 2025 1 Apr 2025 ABSVD Methodology Statement v17 effective from 01 April 2024 28 Mar 2024 ABSVD Methodology Statement v16 effective from 02 November 2023 2 Nov 2023 ABSVD Methodology Statement v15 effective 01 April 2023 31 Mar 2023 ABSVD Methodology Statement v14 effective from 04 November 2022 30 Dec 2022 Balancing Principles Statement Name Published Sort ascending Balancing Principles Statement v25 effective 01 April 2025 1 Apr 2025 Balancing Principles Statement v24 effective 04 October 2024 4 Oct 2024 Balancing Principles Statement v23 effective 01 April 2024 28 Mar 2024 Balancing Principles Statement v22 effective 01 April 2023 31 Mar 2023 Balancing Principles Statement v21 effective from 24 October 2022 24 Oct 2022 Balancing Principles Statement effective from 1 April 2022 24 Oct 2022 Balancing Principles Statement effective from 1 April 2021 31 Mar 2022 Balancing Principles Statement effective from 1 April 2020 14 Sep 2020 Spend Reports Name Published Sort ascending Annual Balancing Services spend report April 2023 - March 2024 1 Dec 2023 Annual Balancing Services spend report April 2022 - March 2023 28 Sep 2023 C9 Consultations On an annual basis, we undertake consultations in respect of the C9 statements. Where applicable we may be required to undertake additional consultations outside of the standard annual review. Procurement Guidelines Statement Procurement Guidelines Statement The Procurement Guideline Statement sets out the principles, whereby, amongst other obligations, we shall procure balancing services in an appropriate competitive manner, publish our requirement through market information reports and/or on our website, purchase from the most economic sources available and not unduly discriminate. Part D, Procurement Mechanisms, of the statement, outlines how we shall procure these balancing services in more detail with the emphasis on market mechanisms such as competitive tenders. Balancing Principles Statement Balancing Principles Statement The purpose of this Balancing Principles Statement is to define the broad principles and criteria (the Balancing Principles) that will determine, at different times and in different circumstances, which Balancing Services NESO will use to assist in the efficient and economic operation of the transmission system. The Balancing Principles statement is designed to assist market participants in understanding the actions NESO takes in achieving the efficient, economic and co-ordinated operation of the transmission system and ensuring the security of the system at all times. Appliable Balancing Services Volume Data Methodology Appliable Balancing Services Volume Data Methodology The purpose of the ABSVD statement is to set out the information on Applicable Balancing Services that will be taken into account under the Balancing and Settlement Code for the purposes of determining Imbalance Volumes. The methodology outlines the basis of the ABSVD calculation and principles as well as providing details of the services that are included. Balancing Services Adjustment Data Methodology Balancing Services Adjustment Data Methodology The purpose of this Statement is to set out the information on relevant balancing services that will be taken into account under the Balancing and Settlement Code for the purposes of determining Imbalance Prices. The Methodology provides details of Balancing Service Adjustment actions and Balancing Services that are included as well as providing worked examples of the methodology. System Management Action Flagging Methodology System Management Action Flagging Methodology The purpose of this Statement is to set out the means which the licensee will use to identify (using reasonable endeavours) balancing services that are for system management reasons, these services are subsequently classified as SO-Flagged. 2026-2027 2025-2026 Rich text Webinar Recordings C9 Annual Review Webinar Procurement and Use of Balancing Services - 13 Nov 2025 - Watch Webinar Documents Name Annex 1 - C9 Consultation Responses 2026-27 SMAF Methodology Statement v20 effective from 01 April 2026 tracked changes for Report Submission Procurement Guidelines Statement v29 effective from 01 April 2026 tracked changes for Report Submission C9 Report to Authority 2026_2027 BSAD Methodology Statement v27 effective from 01 April 2026 tracked changes for Report Submission Balancing Principles Statement v27 effective from 01 April 2026 tracked changes for Report Submission Appendix I - BSAD Statement v27 Clean Copy Example effective from 01 April 2026 for Report Submission Appendix H - ABSVD Statement v21 Clean Copy Example effective from 01 April 2026 for Report Submission ABSVD Methodology Statement v21 effective from 01 April 2026 tracked changes for Report Submission C9 Annual Review Official Consultation 2026-2027 - open until 06 February 2026 Name Published Annual Balancing Services Spend Report April 2023 - March 2024 21 Oct 2024 Past C9 consultations 2025-26 2024-25 2023-24 2022-23 2021-22 2020-21 2019-20 2018-19 2017-18 2017 ABSVD Informal 2016-17 2015-16 2014-15 2013-14 2012-13 2011-12 2010-11 2009-10 2025-26 Name C9 Report to Authority 2025-2026 Ad hoc Ad Hoc C9 and Dynamic Response A18 Consultation Document C9 Annual Report to Authority 2025/2026 Balancing Principles Statement v26 Tracked Changes for Ad hoc Procurement Guidelines Statement v28 Tracked Changes for Ad Hoc BSAD Methodology Statement v26 Tracked Changes for Ad Hoc ABSVD Methodology Statement v20 Tracked Changes for Ad Hoc Annex A Industry Responses to C9 Annual Consultation 2025 CLOSED - C9 Consultation Annual Response Proforma 2025-2026 CLOSED - C9 Consultation Annual Review 2025-2026 2024-25 Rich text Consultation videos Name Published Local Constraints Market Price Adjustment Mechanism 02 Sep 2024 Consultation documents Name Published ABSVD Methodology Statement v19 effective from 01 April 2025 1 Apr 2025 Balancing Principles Statement v25 effective 01 April 2025 1 Apr 2025 Procurement Guidelines Statement v27 effective from 01 April 2025 1 Apr 2025 Annex A C16 Consultation Proforma 3 Feb 2025 Additional C16 Consultation Summer 24 3 Feb 2025 SLC C16 Ad Hoc Consultation Report to Authority 3 Feb 2025 2023-24 Name Published Sort ascending Annex B C16 Consultation Responses 28 Mar 2024 Annual C16 Consultation Report to Authority 2024 2025 21 Mar 2024 ABSVD methodology statement v17 effective from 1 April 2024 (tracked changes) 18 Jan 2024 Balancing Principles statement v23 effective from 1 April 2024 (tracked changes) 18 Jan 2024 Procurement guidelines statement v25 effective from 1 April 2024 (tracked changes) 18 Jan 2024 BSAD methodology statement v24 effective 1 April 2024 (tracked changes) 18 Jan 2024 Annex A C16 formal consultation proforma 18 Jan 2024 Annual C16 formal consultation 2024 2025 18 Jan 2024 SMAF methodology statement v17 effective from 1 April 2024 (tracked changes) 18 Jan 2024 Procurement Guidelines Statement v25 effective from 01 April 2024 Tracked Changes for informal consultation 8 Dec 2023 Name Published Sort ascending Procurement Guidelines Statement v24 effective from 4 November 2023 Tracked Changes for additional consultation 1 Sep 2023 ABSVD Methodology Statement V16 effective from 4 November 2023 Tracked Changes for additional consultation 1 Sep 2023 Annex A Additional C16 Official Consultation Proforma 1 Sep 2023 Additional C16 Consultation 1 Sep 2023 Annex A - Industry Responses to Official Consultation 21 Feb 2023 Balancing Principles Statement v22 effective 01 April 2023 - tracked changes for report 21 Feb 2023 SMAF Methodology Statement v16 effective from 01 April 2023 - tracked changes for report 21 Feb 2023 ABSVD Methodology Statement v15 effective from 01 April 2023 - tracked changes for report 21 Feb 2023 BSAD Methodology Statement v23 effective from 01 April 2023 - tracked changes for report 21 Feb 2023 Procurement Guidelines Statement v23 effective 01 April 2023 - tracked changes for report 21 Feb 2023 2021-22 Name Published Sort ascending C16 2021-22 Official Consultation 12 Jan 2022 Procurement Guidelines Statement v21 01 April 2022 tracked changes for Final Consultation 12 Jan 2022 C16 Official Consultation Proforma 12 Jan 2022 ABSVD methodology Statement v12 01 April 2022 tracked changed for Final Consultation 12 Jan 2022 Balancing Principles Statement v20 01 April 2022 tracked changed for Final Consultation 12 Jan 2022 BSAD Methodology Statement v20 01 April 2022 tracked changed for Final Consultation 12 Jan 2022 SMAF Methodology Statement v14 01 April 2022 tracked changes for Final Consultation 12 Jan 2022 C16 Consultation Proforma (NOW CLOSED) 16 Nov 2021 C16 Early Consultation 2021-22 (NOW CLOSED) 16 Nov 2021 ESO C16 Stakeholder Workshop November 2021 16 Nov 2021 2020-21 Name Published Sort ascending C16 Official Consultation Proforma 11 Jan 2021 C16 2020-21 Official Consultation 11 Jan 2021 C16 Early Consultation 2020-21 (NOW CLOSED) 16 Nov 2020 C16 Early Consultation Proforma (NOW CLOSED) 16 Nov 2020 2019-20 Name Published Sort ascending Feedback Proforma C16 Procurement Guidelines Consultation 2020 6 Apr 2020 Procurement Guidelines 2020 track changed for consultation 6 Apr 2020 Consultation Document C16 Procurement Guidelines 2020 6 Apr 2020 C16 Report to Authority for 2020 1 Apr 2020 Methodology for GB Commercial Arrangements relating to Interconnector Capacity Calculation 23 Feb 2020 Responses to the comments in relation to the consultation on Interconnector Capacity Calculation 17 Jan 2020 Balancing Principle Statement Track Changed 2020-21 13 Jan 2020 BSAD Methodology Statement Track Changed 2020-21 13 Jan 2020 SMAF Methodology Statement Track Changed 2020-21 13 Jan 2020 C16 Consultation Proforma Official Consultation (Consultation is now closed)) 13 Jan 2020 2018-19 Name Appendix A Procurement Guidelines final track changed 18-19 Appendix B BPS final track changed 18-19 Appendix C BSAD final track changed 18-19 Appendix D SMAF final track changed 18-19 Report to authority inclusive of all consultation responses 2018-19 Appendix F Response Proforma C16 2018-19 Consultation Document Appendix E ABSVD final track changed 18-19 2017-18 Name C16 Report to Authority 2018 Appendix A BSAD tracked C16 Report to Authority 2018 Appendix F Engie response C16 Report to Authority 2018 Appendix F EDF tracked C16 Report to Authority 2018 Appendix E C16 Report to Authority 2018 Appendix D SMAF tracked C16 Report to Authority 2018 Appendix C PG tracked C16 Report to Authority 2018 Appendix B BPS tracked C16 2018 Report to Authority Appendix A BSAD methodology tracked ABSVD Report to Authority Appendix D Smartest response ABSVD Report to Authority Appendix D Npower response 2017 ABSVD Informal Name Published Sort ascending ABSVD informal consultation responses non-confidential 8 Feb 2018 ABSVD informal consultation summary and response 8 Feb 2018 Annex C - Response Proforma 16 Nov 2017 Annex B - Draft NG Business Requirements 16 Nov 2017 ABSVD Informal Consultation November 2017 16 Nov 2017 Annex A - ABSVD methodology tracked 16 Nov 2017 2016-17 Name Published Sort ascending APPENDIX F - RESPONSE PROFORMA 18 Aug 2017 APPENDIX A-ABSVD 18 Aug 2017 APPENDIX B-BSAD 18 Aug 2017 APPENDIX C-PG 18 Aug 2017 APPENDIX E-BPS 18 Aug 2017 APPENDIX D-SMAF 18 Aug 2017 C16-CONSULTATION-1617-v1 0 18 Aug 2017 APPENDIX A Change Marked ABSVD from 1 April 2017 18 Aug 2017 APPENDIX B Change Marked BSAD Effective from 1 April 2017 18 Aug 2017 APPENDIX C Change Marked Procurement Guidelines Effective from 1 April 2017 18 Aug 2017 2015-16 Name Published Sort ascending RTA-C16-ANNUAL-CONSULTATION-1516_FINAL 19 Oct 2017 APPENDIX A-ABSVD(1) 19 Oct 2017 APPENDIX B-BSAD(1) 19 Oct 2017 APPENDIX C-PG(1) 19 Oct 2017 APPENDIX D-SMAF(1) 19 Oct 2017 APPENDIX E-BPS(1) 19 Oct 2017 APPENDIX F-C16-CONSULTATION-1516-v2 0 19 Oct 2017 APPENDIX G - Industry Responses 19 Oct 2017 APPENDIX H-PG-Revised 19 Oct 2017 APPENDIX I-SMAF Revised 19 Oct 2017 2014-15 Name Published Sort ascending C16-CONSULTATION-1415-v1_0 19 Oct 2017 SBR clarification letter_301015_final 19 Oct 2017 RTA-C16-INTERIM-CONSULTATION-2015 19 Oct 2017 APPENDIX C - BPS_Post Consultation Change Marked 19 Oct 2017 APPENDIX D - Consultation Document 19 Oct 2017 APPENDIX E - Industry Responses 19 Oct 2017 APPENDIX A - BSAD_Post Consultation Change Marked 19 Oct 2017 APPENDIX B - SMAF_Post Consultation Change Marked 19 Oct 2017 C16-INTERIM-CONSULTATION-2015 19 Oct 2017 APPENDIX A - BSAD 19 Oct 2017 2013-14 Name Published Sort ascending C16-CONSULTATION-1314-v1_0 18 Oct 2017 APPENDIX-A-ABSVD-v5_0 18 Oct 2017 APPENDIX-B-BSAD-V9_0 18 Oct 2017 APPENDIX-C-PG-V13_0 18 Oct 2017 APPENDIX-D-SMAF-V5_0 18 Oct 2017 APPENDIX-E-RESPONSE-PROFORMA 18 Oct 2017 ETR Industry Document_5_Dec13 v 1 18 Oct 2017 Annex 1 - Response Proforma 18 Oct 2017 RTA-APP-H-3-COMBINED 18 Oct 2017 RTA-APP-G-2-COMBINED 18 Oct 2017 2012-13 Name Published Sort ascending Open Letter - BELLA Participation in the BM 18 Oct 2017 C16 Consultation Report 18 Oct 2017 C16 Appendix E SMAF 18 Oct 2017 C16 Consultation Dec 2012 18 Oct 2017 Appendix F - Response Proforma 18 Oct 2017 C16 Consultation Report Annexes 18 Oct 2017 C16 Appendix D PGs 18 Oct 2017 C16 Appendix C BSAD 18 Oct 2017 C16 Appendix A SMAF 18 Oct 2017 C16 Appendix B BPS 18 Oct 2017 2011-12 Name Published Sort ascending Consultation Report 18 Oct 2017 C16 - Appendix J BSAD 18 Oct 2017 Appendix I ABSVD 18 Oct 2017 Appendix H PGs 18 Oct 2017 Appendix G BPS 18 Oct 2017 Managing intermittent and inflexible generation in the Balancing Mechanism Response Proforma 18 Oct 2017 Managing Intermittent and Inflexible Generation in the Balancing Mechanism Consultation 18 Oct 2017 Consultation on loss of access compensation 18 Oct 2017 Consultation on loss of access compensation proforma 18 Oct 2017 Appendix B - Consultation Questions 18 Oct 2017 2010-11 Name Published Sort ascending C16 Consultation 18 Oct 2017 14 Appendix E 18 Oct 2017 Consultation 18 Oct 2017 Appendix D BSAD 18 Oct 2017 Appendix C ABSVD 18 Oct 2017 Appendix B PGs 18 Oct 2017 Appendix A BPS 18 Oct 2017 2009-10 Name Published Sort ascending C16 Consultation Document - 16 January 2009 18 Oct 2017 C16 Consultation document - 16 January 2009 18 Oct 2017 C16 Consultation document - 16 January 2009 (1) 18 Oct 2017 APPENDIX E BPS V12_0 - October 2013 18 Oct 2017 C16 Appendix D BPS technical changes 18 Oct 2017 C16 Authority Report - Appendix F 18 Oct 2017 C16 Authority Report - Appendix D 18 Oct 2017 C16 Appendix F BPS plus plain english changes 18 Oct 2017 C16 Appendix C PGs technical changes 18 Oct 2017 Appendix G - SMAF P217A and Review changes 18 Oct 2017 logo--facebook