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 25-26
Published on 31 March 2025
Variable direct debit form
Published on 10 February 2022
BSUoS data
News
| Name | Published Sort ascending |
|---|---|
| BSUoS Fixed Tariff 4 and Draft Tariff 5 - December 2023 v2 | 29 Jan 2024 |
| BSUoS Payment Calendar 23-24 v2 | 2 Oct 2023 |
| 2024-25 BSUoS Fixed Tariffs Webinar Q and A - 7th July 2023 | 10 Jul 2023 |
| BSUoS Fixed Tariff Webinar Slides - 7th July 2023 | 10 Jul 2023 |
| BSUoS Fixed Tariff 2024-25 - Tariff Publication - 30 June 2023 | 30 Jun 2023 |
| BSUoS Fixed Tariff Webinar Slides and Recording - 5th April 2023 | 13 Apr 2023 |
| Final BSUoS Fixed Tariff 2023-24 Webinar Slides | 8 Feb 2023 |
| Final BSUoS Fixed Tariff 2023-24 | 31 Jan 2023 |
| Draft BSUoS Fixed Tariff Webinar - Q and A | 25 Nov 2022 |
| Draft BSUoS Fixed Tariff Webinar Slides | 23 Nov 2022 |
Useful information and documents
BSUoS Fixed tariffs
BSUoS Monthly Forecast
| Name | Published Sort ascending |
|---|---|
| BSUoS outturn - May 2024 | 14 Jun 2024 |
| BSUoS outturn - April 2024 | 16 May 2024 |
| BSUoS Outturn Chart and Commentary- March 2024 | 15 Apr 2024 |
| BSUoS Forecast Report - May 2024 | 15 Apr 2024 |
| BSUoS Forecast Report - Apr 2024 | 15 Mar 2024 |
| BSUoS Outturn Chart and Commentary- February 2024 | 15 Mar 2024 |
| BSUoS Outturn Chart and Commentary - January 2024 | 15 Feb 2024 |
| BSUoS Forecast Report - March 2024 | 15 Feb 2024 |
| BSUoS outturn - December 2023 | 15 Jan 2024 |
| BSUoS Forecast Report - Feb 2024 | 15 Jan 2024 |
Current BSUoS data
CMP395 BSUoS Data
CMP381 BSUoS Data
CMP345/350 BSUoS data
Current BCR data
| Name | Published Sort ascending |
|---|---|
| 2024-04-18 BCRNEW | 18 Apr 2024 |
| 2024-04-17 BCRNEW | 17 Apr 2024 |
| 2024-04-16 BCRNEW | 16 Apr 2024 |
| 2024-04-15 BCRNEW | 15 Apr 2024 |
| 2024-04-12 BCRNEW | 12 Apr 2024 |
| 2024-04-11 BCRNEW | 11 Apr 2024 |
| 2024-04-10 BCRNEW | 10 Apr 2024 |
| 2024-04-09 BCRNEW | 9 Apr 2024 |
| 2024-04-08 BCRNEW | 8 Apr 2024 |
| 2024-04-05 BCRNEW | 5 Apr 2024 |
Historical BSUoS data - II
Historical BSUoS data - SF
| Name | Published Sort ascending |
|---|---|
| 2003-2004 SF | 7 Apr 2014 |
| 2002-2003 SF | 6 Apr 2014 |
| 2001-2002 SF | 5 Apr 2014 |
| 2000-2001 SF | 4 Apr 2014 |
Historical BSUoS data - RF
| Name | Published Sort ascending |
|---|---|
| 2002-2003 RF | 7 Apr 2014 |
| 2001-2002 RF | 6 Apr 2014 |
| 2000-2001 RF | 5 Apr 2014 |
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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