System balancing reports
On this page, you will find reports that we publish relating to the commercial operation of the electricity transmission system.
The service reports show the requirements for balancing services and the results of tender assessments. A service by service summary of the cost of balancing services is provided in the monthly balancing services summary (MBSS).
Service reports
The service reports show the requirements for balancing services and the results of tender assessments. A service by service summary of the cost of balancing services is provided in the monthly balancing services summary (MBSS).
Monthly balancing services summaries (MBSS)
From 2nd March 2020, MBSS files will be published on our new NESO Data Portal.
Please see link below for the location:
| Name | Published Sort ascending |
|---|---|
| MBSS Data January 2020 V2 | 9 Mar 2020 |
| MBSS January 2020 V2 | 9 Mar 2020 |
| MBSS Data January 2020 | 28 Feb 2020 |
| MBSS January 2020 | 28 Feb 2020 |
| MBSS Data December 2019 | 31 Jan 2020 |
| MBSS December 2019 | 31 Jan 2020 |
| MBSS Data November 2019 V2 | 22 Jan 2020 |
| MBSS November 2019 V3 | 22 Jan 2020 |
| MBSS November 2019 V2 | 8 Jan 2020 |
| MBSS November 2019 | 31 Dec 2019 |
Past MBSS packs
| Name | Published Sort ascending |
|---|---|
| 2014_15 - MBSS Pack | 17 Nov 2015 |
| 2006_07 - MBSS Pack | 17 Nov 2015 |
| 2013_14 - MBSS Pack | 17 Nov 2015 |
Past MBSS packs
From 1st March 2020, Daily balancing costs (BSUoS) files will be published on our new NESO Data Portal.
Please see link below for the daily historic outturn & forecast file:
https://data.nationalenergyso.com/balancing/bsuos-monthly-cost
Please see link below for the daily balancing costs data files:
https://data.nationalenergyso.com/balancing/daily-balancing-costs-balancing-services-use-of-system
Please see link below for the daily balancing costs report files:
| Name | Published Sort ascending |
|---|---|
| 2020-03-05 pdf | 9 Mar 2020 |
| 2020-03-02 excel | 4 Mar 2020 |
| 2020-03-02 pdf | 4 Mar 2020 |
| 2020-02-29 EXCEL | 3 Mar 2020 |
| 2020-03-01 Excel | 3 Mar 2020 |
| 2020-02-29 PDF | 3 Mar 2020 |
| 2020-03-01 pdf | 3 Mar 2020 |
| 2020-02-28 Excel | 2 Mar 2020 |
| 2020-02-27 EXCEL | 2 Mar 2020 |
| 2020-02-28 pdf | 2 Mar 2020 |
STOR
| Name | Published Sort ascending |
|---|---|
| STOR EBGL Consultation Service Terms Final Draft Redline | 10 Feb 2021 |
| Article 18 Ofgem Letter - STOR 3 Feb 2021 Final | 10 Feb 2021 |
| STOR TR39 MIR | 11 Oct 2019 |
| TR39_MIR_tables_and_charts | 11 Oct 2019 |
| TR39 Results Appendix - EXT | 20 Sep 2019 |
| TR38_MIR_tables_and_charts | 26 Jul 2019 |
| STOR TR38 MIR | 26 Jul 2019 |
| TR38 Results Appendix - EXT | 28 Jun 2019 |
| STOR TR37 MIR | 22 Mar 2019 |
| TR37_MIR_tables_and_charts | 22 Mar 2019 |
Fast reserve
| Name | Published Sort ascending |
|---|---|
| FR Market Information June21 | 20 Apr 2021 |
| FR Market Information May21 | 15 Mar 2021 |
| FR Market Information April21 | 12 Feb 2021 |
| FR Market Information March21 | 18 Jan 2021 |
| FR Market Information February21 | 15 Dec 2020 |
| FR Market Information January21 | 16 Nov 2020 |
| FR Market Information December20 | 16 Oct 2020 |
| FR Market Information November20 | 24 Sep 2020 |
| FR Market Information October20 | 26 Aug 2020 |
| FR Market Information September20 | 4 Aug 2020 |
FFR market information reports
| Name | Published Sort ascending |
|---|---|
| Frequency Response Products MIR Jan 2024 | 1 Jan 2024 |
| Frequency Response Products MIR Dec 2023 | 1 Dec 2023 |
| Frequency Response Products MIR Nov 2023 | 1 Nov 2023 |
| Frequency Response Products MIR Oct 2023 | 1 Oct 2023 |
| Frequency Response Products MIR Sept 2023.v2 | 1 Sep 2023 |
| Frequency Response Products MIR Sept 2023 | 1 Sep 2023 |
| Frequency Response Products MIR Aug 2023 | 1 Aug 2023 |
| FFR Market Information Report Apr 2023 | 1 Apr 2023 |
| Frequency Response Products MIR Apr 2023 | 1 Apr 2023 |
| Static FFR Mock Auction: Results and Feedback - webinar slides | 9 Mar 2023 |
FFR pre and post tender
| Name | Published Sort ascending |
|---|---|
| Post Tender Report TR135 March 2021 - EXT | 16 Mar 2021 |
| Post Tender Report TR134 February 2021- EXT | 16 Feb 2021 |
| Post Tender Report TR133 January 2021- EXT | 19 Jan 2021 |
| Post Tender Report- TR132 December 2020- EXT | 16 Dec 2020 |
| Post Tender Report - TR131 November 2020- EXT | 17 Nov 2020 |
| Post Tender Report - TR130 October 2020 - EXt | 16 Oct 2020 |
| Post Tender Report - TR129 September 2020- EXT | 16 Sep 2020 |
| Post Tender Report TR128 August 2020 - EXT | 18 Aug 2020 |
| Post Tender Report TR127 July 2020 - Amended | 30 Jul 2020 |
| Post Tender Report- TR127 July 2020 – EXT | 16 Jul 2020 |