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 Payment Calendar 24-25 v6 | 1 Jul 2024 |
| BSUoS Fixed Tariff 5 and Draft Tariff 6 - June 2024 v1 | 28 Jun 2024 |
| BSUoS Payment Calendar 24-25 v5 | 10 Jun 2024 |
| BSUoS Payment Calendar 24-25 v4 | 20 May 2024 |
| BSUoS Payment Calendar 24-25 v3 | 13 May 2024 |
| BSUoS - Forecast Model, Revenue vs Costs and Tariff Updates Webinar Q&A v1.0 | 2 May 2024 |
| BSUoS - Forecast Model, Revenue vs Costs and Tariff Updates Webinar v1.0 | 26 Apr 2024 |
| BSUoS Payment Calendar 24-25 v2 | 22 Apr 2024 |
| BSUoS Payment Calendar 24-25 v1 | 25 Mar 2024 |
| BSUoS Fixed Tariff Webinar Slides and Recording - 11th January 2024 | 29 Jan 2024 |
Useful information and documents
| Name | Published Sort ascending |
|---|---|
| BSUoS payment calendar 24-25 v3 | 13 May 2024 |
| BSUoS - Forecast Model, Revenue vs Costs and Tariff Updates Webinar Q&A v1.0 | 2 May 2024 |
| BSUoS - Forecast Model, Revenue vs Costs and Tariff Updates Webinar v1.0 | 26 Apr 2024 |
| BSUoS Payment Calendar 24-25 v2 | 22 Apr 2024 |
| BSUoS Payment Calendar 24-25 v1 | 25 Mar 2024 |
| BSUoS Payment Calendar 23-24 v2 | 2 Oct 2023 |
| BSUoS Fixed Tariff Model Consultation 2 - Webinar Slides August 2022 | 16 Aug 2022 |
| BSUoS Fixed Tariff Model Consultation - Webinar Q and A June 2022 | 1 Jul 2022 |
| BSUoS Payment Calendar 2021-22 v9 | 7 Dec 2021 |
| Introduction to BSUoS Charges | 5 Feb 2019 |
BSUoS Fixed tariffs
BSUoS Monthly Forecast
| Name | Published Sort ascending |
|---|---|
| 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 |
| BSUoS outturn - July 2024 | 16 Aug 2024 |
| BSUoS Forecast Report - September 2024 | 16 Aug 2024 |
| BSUoS Forecast Report - August 2024 | 16 Jul 2024 |
| BSUoS Forecast Report - June 2024 V2 | 16 Jul 2024 |
| BSUoS outturn - June 2024 | 16 Jul 2024 |
| BSUoS Forecast Report - July 2024 | 14 Jun 2024 |
Current BSUoS data
CMP395 BSUoS Data
CMP381 BSUoS Data
CMP345/350 BSUoS data
Current BCR data
| Name | Published Sort ascending |
|---|---|
| 2024-06-03 BCRNEW | 3 Jun 2024 |
| 2024-05-31 BCRNEW | 31 May 2024 |
| 2024-05-30 BCRNEW | 30 May 2024 |
| 2024-05-29 BCRNEW | 29 May 2024 |
| 2024-05-28 BCRNEW | 28 May 2024 |
| 2024-04-25 BCRNEW | 25 Apr 2024 |
| 2024-04-24 BCRNEW | 24 Apr 2024 |
| 2024-04-23 BCRNEW | 23 Apr 2024 |
| 2024-04-22 BCRNEW | 22 Apr 2024 |
| 2024-04-19 BCRNEW | 19 Apr 2024 |
Historical BSUoS data - II
Historical BSUoS data - SF
| Name | Published Sort ascending |
|---|---|
| 2013-2014 SF | 18 Jan 2017 |
| 2012-2013 SF | 16 Apr 2014 |
| 2011-2012 SF | 15 Apr 2014 |
| 2010-2011 SF | 14 Apr 2014 |
| 2009-2010 SF | 13 Apr 2014 |
| 2008-2009 SF | 12 Apr 2014 |
| 2007-2008 SF | 11 Apr 2014 |
| 2006-2007 SF | 10 Apr 2014 |
| 2005-2006 SF | 9 Apr 2014 |
| 2004-2005 SF | 8 Apr 2014 |
Historical BSUoS data - RF
| Name | Published Sort ascending |
|---|---|
| 2012-2013 RF | 2 Jun 2017 |
| 2011-2012 RF | 16 Apr 2014 |
| 2010-2011 RF | 15 Apr 2014 |
| 2009-2010 RF | 14 Apr 2014 |
| 2008-2009 RF | 13 Apr 2014 |
| 2007-2008 RF | 12 Apr 2014 |
| 2006-2007 RF | 11 Apr 2014 |
| 2005-2006 RF | 10 Apr 2014 |
| 2004-2005 RF | 9 Apr 2014 |
| 2003-2004 RF | 8 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.
More from charging
Charging documentation
Our charging documentation page is where you can now find all of our charging statements and policy developments along with all the guidance documents and webinars you need if you're new to charging.
Contact charging
Submit a query through our webform, get involved through forums and steering groups, or reach out to the relevant charging team.
Join our mailing list
Join our mailing list to receive publication updates, invitations to our forums, webinars and workshops, and links to our latest guidance materials.