C9 statements and consultations
We are required to establish statements and guidelines in accordance with special condition C9 of the statements of the NESO 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. The statements on this page currently refer to C16 as this was the correct licence condition at the time of consultation
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Here you can find the latest versions of C9-related statements including the Balancing Principles Statement Report and guidelines.
Latest versions
Here you can find previous versions of C9-related statements and guidelines.
Procurement Guidelines
Balancing services adjustment data (BSAD)
| Name | Published |
|---|---|
| BSAD Methodology Statement v22 effective from 04 November 2022 | 4 Nov 2022 |
Balancing principles statement report
By accessing these reports, you are agreeing to our terms and conditions.
System management action flagging
| Name | Published |
|---|---|
| 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 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 |
| Flagging Accuracy Report May 2012 - April 2013 | 10 Jul 2017 |
Applicable balancing services volume data (ABSVD)
Balancing Principles Statement
| Name | Published |
|---|---|
| Balancing Principles Statement v21 effective from 24 October 2022 | 24 Oct 2022 |
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
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
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
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
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
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.
2025-26
2024-25
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 |
| SLC C16 Ad Hoc Consultation Report to Authority | 3 Feb 2025 |
| Annex A C16 Consultation Proforma | 3 Feb 2025 |
| Additional C16 Consultation Summer 24 | 3 Feb 2025 |
2023-24
2021-22
2020-21
| Name | Published Sort ascending |
|---|---|
| C16 Official Consultation Proforma | 11 Jan 2021 |
| C16 2020-21 Official Consultation | 11 Jan 2021 |
| C16 Early Consultation Proforma (NOW CLOSED) | 16 Nov 2020 |
| C16 Early Consultation 2020-21 (NOW CLOSED) | 16 Nov 2020 |
2019-20
2018-19
2017-18
2017 ABSVD Informal
| Name | Published Sort ascending |
|---|---|
| ABSVD informal consultation summary and response | 8 Feb 2018 |
| ABSVD informal consultation responses non-confidential | 8 Feb 2018 |
| ABSVD Informal Consultation November 2017 | 16 Nov 2017 |
| Annex B - Draft NG Business Requirements | 16 Nov 2017 |
| Annex A - ABSVD methodology tracked | 16 Nov 2017 |
| Annex C - Response Proforma | 16 Nov 2017 |
2016-17
| Name | Published Sort ascending |
|---|---|
| C16 Annual Changes Report to Authority 1617 | 18 Aug 2017 |
| APPENDIX G UKPR Response | 18 Aug 2017 |
| APPENDIX F Consultation Document 1617 | 18 Aug 2017 |
| APPENDIX D Change Marked SMAF Effective from 1 April 2017 | 18 Aug 2017 |
| APPENDIX B Change Marked BSAD Effective from 1 April 2017 | 18 Aug 2017 |
| APPENDIX D-SMAF | 18 Aug 2017 |
| APPENDIX C-PG | 18 Aug 2017 |
| APPENDIX A-ABSVD | 18 Aug 2017 |
| APPENDIX G Uniper Response | 18 Aug 2017 |
| APPENDIX G Drax Response | 18 Aug 2017 |
2015-16
| Name | Published Sort ascending |
|---|---|
| Appendix F - Response Proforma | 19 Oct 2017 |
| APPENDIX C-PG | 19 Oct 2017 |
| APPENDIX A-ABSVD | 19 Oct 2017 |
| C16-CONSULTATION-1516-v2 0 | 19 Oct 2017 |
| APPENDIX H-PG-Revised | 19 Oct 2017 |
| APPENDIX F-C16-CONSULTATION-1516-v2 0 | 19 Oct 2017 |
| APPENDIX D-SMAF(1) | 19 Oct 2017 |
| APPENDIX B-BSAD(1) | 19 Oct 2017 |
| RTA-C16-ANNUAL-CONSULTATION-1516_FINAL | 19 Oct 2017 |
| APPENDIX B-BSAD | 19 Oct 2017 |
2014-15
| Name | Published Sort ascending |
|---|---|
| Post ETR consultation Report 07 March 2014 | 19 Oct 2017 |
| NBS Pricing Decision Letter_v1_0 | 19 Oct 2017 |
| APPENDIX-B-RESPONSE-PROFORMA-1415 | 19 Oct 2017 |
| Open Letter - proposals for NBS treatment in cashout | 19 Oct 2017 |
| APPENDIX C - BPS | 19 Oct 2017 |
| APPENDIX A - BSAD | 19 Oct 2017 |
| APPENDIX B - SMAF_Post Consultation Change Marked | 19 Oct 2017 |
| APPENDIX E - Industry Responses | 19 Oct 2017 |
| APPENDIX C - BPS_Post Consultation Change Marked | 19 Oct 2017 |
| SBR clarification letter_301015_final | 19 Oct 2017 |
2013-14
| Name | Published Sort ascending |
|---|---|
| APPENDIX-A-BPS-V12_0 October 13 | 18 Oct 2017 |
| APPENDIX-C-PG-V12_0 October 13 | 18 Oct 2017 |
| APPENDIX-F-BSAD-V8_0 October 13 | 18 Oct 2017 |
| APPENDIX-H-BPS-V12_0 October 13 | 18 Oct 2017 |
| APPENDIX-K-PG-V12_0 October 13 | 18 Oct 2017 |
| C-16-DSBR-SBR-CONSULTATION-2013 | 18 Oct 2017 |
| C16-RTA-INTERIM-2013-FINAL | 18 Oct 2017 |
| RTA-APP-A-CONDOC | 18 Oct 2017 |
| RTA-APP-C-2-COMBINED | 18 Oct 2017 |
| RTA-APP-E-RESPONSES-COMBINED | 18 Oct 2017 |
2012-13
| Name | Published Sort ascending |
|---|---|
| NGET Response - BELLA Participation in the BM | 18 Oct 2017 |
| B12 Formalising two shifting limit and other parameters | 18 Oct 2017 |
| C16 Appendix A SMAF | 18 Oct 2017 |
| C16 Appendix D PGs | 18 Oct 2017 |
| Appendix F - Response Proforma | 18 Oct 2017 |
| C16 Appendix E SMAF | 18 Oct 2017 |
| Open Letter - BELLA Participation in the BM | 18 Oct 2017 |
| C16 Appendix A ABSVD | 18 Oct 2017 |
| C16 Appendix B BPS | 18 Oct 2017 |
| C16 Appendix C BSAD | 18 Oct 2017 |
2011-12
| Name | Published Sort ascending |
|---|---|
| C16 Consultation | 18 Oct 2017 |
| Consultation on loss of access compensation proforma | 18 Oct 2017 |
| Managing Intermittent and Inflexible Generation in the Balancing Mechanism Consultation | 18 Oct 2017 |
| Appendix G BPS | 18 Oct 2017 |
| Appendix I ABSVD | 18 Oct 2017 |
| Consultation Report | 18 Oct 2017 |
| Appendix B - Consultation Questions | 18 Oct 2017 |
| Consultation on loss of access compensation | 18 Oct 2017 |
| Managing intermittent and inflexible generation in the Balancing Mechanism Response Proforma | 18 Oct 2017 |
| Appendix H PGs | 18 Oct 2017 |
2010-11
| Name | Published Sort ascending |
|---|---|
| Appendix A BPS | 18 Oct 2017 |
| Appendix C ABSVD | 18 Oct 2017 |
| Consultation | 18 Oct 2017 |
| C16 Consultation | 18 Oct 2017 |
| Appendix B PGs | 18 Oct 2017 |
| Appendix D BSAD | 18 Oct 2017 |
| 14 Appendix E | 18 Oct 2017 |
2009-10
| Name | Published Sort ascending |
|---|---|
| C16 Appendix C PGs technical changes | 18 Oct 2017 |
| C16 Authority Report - Appendix D | 18 Oct 2017 |
| C16 Appendix D BPS technical changes | 18 Oct 2017 |
| Apendix C | 18 Oct 2017 |
| Appendix C - SMAF P217A | 18 Oct 2017 |
| Appendix E - BSAD P217A and Review changes | 18 Oct 2017 |
| C16 BPS Appendix A - 'cat5' | 18 Oct 2017 |
| C16 Authority Report | 18 Oct 2017 |
| C16 Authority Report - Appendix A | 18 Oct 2017 |
| C16 Authority Report - Appendix E | 18 Oct 2017 |
These documents outline the GB methodology for commercial arrangements for payments relating to interconnector (IC) capacity restrictions resulting from NTC restrictions set by National Energy System Operator (NESO). The commercial arrangements in these documents should be applied to:
- all interconnector projects (existing and future) that are connected to the GB transmission system
- capacity calculations made both before and after the firmness deadline
This methodology should be applied in full to ensure consistency of NTC arrangements across all GB connected interconnectors.