Balancing Services Use of System (BSUoS) charges
The BSUoS charge recovers the cost of day-to-day operation including the cost of balancing the electricity transmission system.
Who does this charge apply to?
Please note that there are exemptions to the below list.
✓ Final demand site
✓ Suppliers
✓ Directly-connected transmission demand
✕ Non-Final demand site
✕ Generators
✕ Distribution Network Operators
✕ Embedded generators
✕ Interconnectors
CMP308 and CMP361 came into effect on 1 April 2023, which changed the recovery process of BSUoS charges. CMP308 defined that BSUoS charges are recovered solely from final demand, and CMP361 introduced an ex-ante fixed BSUoS tariff.
The BSUoS fixed tariffs and BSUoS monthly forecasts are published within the BSUoS data section below.
For more details on how BSUoS is charged, see paragraph 14.31 of the Connection and Use of System Code (CUSC).
For pre-April 2023 BSUoS methodology, refer to the Introduction to BSUoS - 2019.
Introduction to BSUoS
For general information about the BSUoS charging process, download our introduction presentation.
Latest news and updates
2024/25 BSUoS fixed tariffs webinar slides
Published on 10 July 2023
2024/25 BSUoS fixed tariff publication
Published on 30 June 2023
2023/24 BSUoS fixed tariff webinar slides
Published on 8 February 2023
2023/24 BSUoS fixed tariff publication
Published on 31 January 2023
Useful information and documents
BSUoS Payment Calendar 24-25 v9
Published on 16 January 2025
Variable direct debit form
Published on 10 February 2022
BSUoS data
News
Useful information and documents
| Name | Published Sort ascending |
|---|---|
| BSUoS Payment Calendar 24-25 v9 | 16 Jan 2025 |
| BSUoS Payment Calendar 24-25 v9 | 16 Jan 2025 |
| BSUoS Payment Calendar 24-25 v8.1 | 15 Jan 2025 |
| BSUoS Payment Calendar 24-25 v8 | 15 Jan 2025 |
| Variable Direct Debit Form | 31 Dec 2024 |
| BSUoS Payment Calendar 24-25 v6 | 1 Jul 2024 |
| BSUoS Payment Calendar 24-25 v5 | 10 Jun 2024 |
| BSUoS Payment Calendar 24-25 v4 | 20 May 2024 |
| BSUoS Payment Calendar 24-25 v4 | 20 May 2024 |
| BSUoS Payment Calendar 24-25 v3 | 13 May 2024 |
BSUoS Fixed tariffs
BSUoS Monthly Forecast
| Name | Published Sort ascending |
|---|---|
| BSUoS Forecast Report - February 2025 | 15 Jan 2025 |
| BSUoS outturn - December 2024 | 15 Jan 2025 |
| BSUoS Forecast Report - January 2025 | 13 Dec 2024 |
| BSUoS outturn - September 2024 | 13 Dec 2024 |
| BSUoS outturn - October 2024 | 13 Dec 2024 |
| BSUoS Outturn - November 2024 | 13 Dec 2024 |
| BSUoS Forecast Report - December 2024 | 15 Nov 2024 |
| BSUoS Forecast Report - November 2024 | 15 Oct 2024 |
| BSUoS outturn - August 2024 | 30 Sep 2024 |
| BSUoS Forecast Report - October 2024 | 13 Sep 2024 |
Current BSUoS data
| Name | Published Sort ascending |
|---|---|
| Current SF BSUoS Data | 17 Jan 2025 |
| Current II BSUoS Data | 17 Jan 2025 |
| Fixed Tariff Revenue vs Costs Report | 17 Jan 2025 |
| Current RF BSUoS Data | 14 Jan 2025 |
CMP395 BSUoS Data
| Name | Published |
|---|---|
| CMP395 SF BSUoS Data | 3 May 2023 |
| CMP395 II BSUoS Data | 13 Apr 2023 |
CMP381 BSUoS Data
| Name | Published Sort ascending |
|---|---|
| CMP381 SF BSUoS Data | 13 May 2022 |
| CMP381 II BSUoS Data | 11 Apr 2022 |
CMP345/350 BSUoS data
| Name | Published Sort ascending |
|---|---|
| CMP345/350 SF BSUoS Data | 17 Nov 2020 |
| CMP345/350 II BSUoS Data | 2 Nov 2020 |
Current BCR data
| Name | Published Sort ascending |
|---|---|
| 2024-06-17 BCRNEW | 17 Jun 2024 |
| 2024-06-14 BCRNEW | 14 Jun 2024 |
| 2024-06-13 BCRNEW | 13 Jun 2024 |
| 2024-06-12 BCRNEW | 12 Jun 2024 |
| 2024-06-11 BCRNEW | 11 Jun 2024 |
| 2024-06-10 BCRNEW | 10 Jun 2024 |
| 2024-06-07 BCRNEW | 7 Jun 2024 |
| 2024-06-06 BCRNEW | 6 Jun 2024 |
| 2024-06-05 BCRNEW | 5 Jun 2024 |
| 2024-06-04 BCRNEW | 4 Jun 2024 |
Historical BSUoS data - II
| Name | Published Sort ascending |
|---|---|
| 2023-2024 II | 11 Apr 2024 |
| 2022-2023 II | 19 Apr 2023 |
| 2021-2022 II | 21 Sep 2022 |
| 2020-2021 II | 21 Feb 2022 |
| 2019-2020 II | 6 Jan 2021 |
| 2018-2019 II | 6 Jan 2021 |
| 2017-2018 II | 3 Sep 2018 |
Historical BSUoS data - SF
| Name | Published Sort ascending |
|---|---|
| 2023-2024 SF | 25 Apr 2024 |
| 2022-2023 SF | 28 Apr 2023 |
| 2021-2022 SF | 21 Sep 2022 |
| 2018-2019 SF | 24 Jan 2022 |
| 2020-2021 SF | 24 Jan 2022 |
| 2019-2020 SF | 24 Jan 2022 |
| 2017-2018 SF | 3 Sep 2018 |
| 2016-2017 SF | 4 Jan 2018 |
| 2015-2016 SF | 21 Jan 2017 |
| 2014-2015 SF | 20 Jan 2017 |
Historical BSUoS data - RF
| Name | Published Sort ascending |
|---|---|
| 2022-2023 RF | 24 Jun 2024 |
| 2021-2022 RF | 30 Oct 2023 |
| 2020-2021 RF | 10 Mar 2023 |
| 2018-2019 RF | 24 Jan 2022 |
| 2019-2020 RF | 24 Jan 2022 |
| 2017-2018 RF | 24 Jan 2022 |
| 2016-2017 RF | 3 Sep 2018 |
| 2015-2016 RF | 4 Jan 2018 |
| 2014-2015 RF | 4 Jun 2017 |
| 2013-2014 RF | 3 Jun 2017 |
Forecast volumes and costs
Breakdown of operating margin (OPMR), based on forecast volume of reserve, forecast volume of frequency response required, annual weighting factors for STOR contracts, and forecasts of BSUoS charges.
Industry Data and Reports
Contains data and support for users of the National Electricity Transmission System (NETS). Here you will find the latest operational data, forecasts, and reports.
Data Portal
Use the ESO Data Portal to gain access to BSUoS Charges and Balancing Costs related datasets that are geared towards API compatibility, providing additional flexibility to end users.
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