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
BSUoS Fixed Tariffs 7 and 8 for 2026/27
Published on 29 December 2025
BSUoS Fixed Tariff 6 for October 2025–March 2026
Published on 20 December 2024
BSUoS Fixed Tariff 5 and Draft Tariff 6 for Apr 2025 – Sep 2025
Published on 28 June 2024
Useful information and documents
BSUoS Payment Calendar 26-27
Published on 25 September 2026
Variable direct debit form
Published on 05 August 2026
BSUoS data
News
| Name | Published Sort ascending |
|---|---|
| BSUoS Payment Calendar 26-27 v10 | 25 Sep 2026 |
| BSUoS Payment Calendar 26-27 v10 | 24 Sep 2026 |
| BSUoS Payment Calendar 26-27 v8 | 23 Sep 2026 |
| BSUoS Payment Calendar 26-27 v7 | 21 Sep 2026 |
| BSUoS Payment Calendar 26-27 v6 | 16 Sep 2026 |
| BSUoS Payment Calendar 26-27 v7 | 11 Sep 2026 |
| BSUoS Payment Calendar 26-27 v5 | 10 Sep 2026 |
| BSUoS Payment Calendar 26-27 v4 | 4 Jun 2026 |
| BSUoS Payment Calendar 26-27 v2 | 2 Apr 2026 |
| BSUoS Payment Calendar 26-27 v1 | 3 Mar 2026 |
Useful information and documents
| Name | Published Sort ascending |
|---|---|
| BSUoS Payment Calendar 26-27 v10 | 25 Sep 2026 |
| BSUoS Payment Calendar 26-27 v10 | 24 Sep 2026 |
| BSUoS Payment Calendar 26-27 v8 | 23 Sep 2026 |
| BSUoS Payment Calendar 26-27 v7 | 21 Sep 2026 |
| BSUoS Payment Calendar 26-27 v6 | 16 Sep 2026 |
| BSUoS Payment Calendar 26-27 v7 | 11 Sep 2026 |
| BSUoS Payment Calendar 26-27 v5 | 10 Sep 2026 |
| BSUoS Payment Calendar 26-27 v4 | 4 Jun 2026 |
| BSUoS Payment Calendar 26-27 v2 | 2 Apr 2026 |
| BSUoS Payment Calendar 25-26 v4.1 | 5 Nov 2025 |
BSUoS Fixed tariffs
BSUoS Monthly Forecast
| Name | Published Sort ascending |
|---|---|
| BSUoS Forecast Report - November 2026 | 15 Oct 2026 |
| BSUoS Outturn - September 2026 | 15 Oct 2026 |
| BSUoS Forecast Report - October 2026 | 21 Sep 2026 |
| BSUoS Outturn - August 2026 | 15 Sep 2026 |
| BSUoS Outturn - July 2026 | 14 Aug 2026 |
| BSUoS Forecast Report - September 2026 | 14 Aug 2026 |
| BSUoS Outturn - June 2026 | 15 Jul 2026 |
| BSUoS Forecast Report - August 2026 | 15 Jul 2026 |
| BSUoS Outturn - May 2026 | 15 Jun 2026 |
| BSUoS Forecast Report - July 2026 | 15 Jun 2026 |
Current BSUoS data
| Name | Published |
|---|---|
| Fixed Tariff Revenue vs Costs Report | 23 Oct 2026 |
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 |
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 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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