Charging documentation | National Energy System Operator

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Charging documentation Add to favourites Close tooltip Sign in to add this page to your favourites [Sign in or register](/saml-login) Show favourites Close Close tooltip Sign in or register to manage your favourites [Sign in or register](/saml-login) [Help](https://www.neso.energy/help-centre) ###### In this section * [The charges for using GB's electricity system](/industry-information/charging/charges-using-great-britains-electricity-system) [The charges for using GB's electricity system](/industry-information/charging/charges-using-great-britains-electricity-system) Back [The charges for using GB's electricity system](/industry-information/charging/charges-using-great-britains-electricity-system) [View](/industry-information/charging/charges-using-great-britains-electricity-system) * [Transmission Network Use of System (TNUoS) Charges](/industry-information/charging/tnuos-charges) [Transmission Network Use of System (TNUoS) Charges](/industry-information/charging/tnuos-charges) Back [Transmission Network Use of System (TNUoS) Charges](/industry-information/charging/tnuos-charges) [View](/industry-information/charging/tnuos-charges) * [Balancing Services Use of System (BSUoS) charges](/industry-information/charging/balancing-services-use-system-bsuos-charges) [Balancing Services Use of System (BSUoS) charges](/industry-information/charging/balancing-services-use-system-bsuos-charges) Back [Balancing Services Use of System (BSUoS) charges](/industry-information/charging/balancing-services-use-system-bsuos-charges) [View](/industry-information/charging/balancing-services-use-system-bsuos-charges) * [Connection charges](/industry-information/charging/connection-charges) [Connection charges](/industry-information/charging/connection-charges) Back [Connection charges](/industry-information/charging/connection-charges) [View](/industry-information/charging/connection-charges) * [Assistance for Areas with High Electricity Distribution Costs (AAHEDC)](/industry-information/charging/assistance-areas-high-electricity-distribution-costs-aahedc) [Assistance for Areas with High Electricity Distribution Costs (AAHEDC)](/industry-information/charging/assistance-areas-high-electricity-distribution-costs-aahedc) Back [Assistance for Areas with High Electricity Distribution Costs (AAHEDC)](/industry-information/charging/assistance-areas-high-electricity-distribution-costs-aahedc) [View](/industry-information/charging/assistance-areas-high-electricity-distribution-costs-aahedc) * [Charging Futures](/industry-information/charging/charging-futures) [Charging Futures](/industry-information/charging/charging-futures) Back [Charging Futures](/industry-information/charging/charging-futures) [View](/industry-information/charging/charging-futures) * [Charging documentation](/industry-information/charging/charging-documentation) [Charging documentation](/industry-information/charging/charging-documentation) Back [Charging documentation](/industry-information/charging/charging-documentation) [View](/industry-information/charging/charging-documentation) * [Contact charging](/industry-information/charging/contact-charging) [Contact charging](/industry-information/charging/contact-charging) Back [Contact charging](/industry-information/charging/contact-charging) [View](/industry-information/charging/contact-charging)  ## You are now signed in Visit My NESO account to view and manage your dataset subscriptions. Maybe later [Go to your account](/user/dashboard) # 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. [Charging guidance](#Charging-guidance) [Charging Statements](#Charging-Statements) [Charging policy developments](#Charging-policy-developments) Charging guidance Charging Statements Charging policy developments Charging guidance In this section you will find guidance materials to help you understand how, when and what you'll be charged. The methodology we use to set tariffs and calculate charges is in the [Connection and Use of System Code (CUSC)](/industry-information/codes/connection-and-use-system-code-cusc), Section 14. TNUoS guidance BSUoS guidance Connection charging guidance AAHEDC guidance General charging guidance STAR Billing System Guidance Archive 2025 Archive 2024 Archive 2023 Archive 2022 Archive 2019 Archive 2018 TNUoS guidance BSUoS guidance Connection charging guidance AAHEDC guidance General charging guidance STAR Billing System Guidance Archive 2025 Archive 2024 Archive 2023 Archive 2022 Archive 2019 Archive 2018 ## TNUoS guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [TNUoS for offshore generators and the OFTO regime](/document/300751/download) | 19 Mar 2026 | | [Guidance - Half-Hourly Demand tariffs for users connected at GSP's with multiple DNO's](/document/244931/download) | 18 Mar 2026 | | [Guidance - TNUoS onshore local circuit charges](/document/195946/download) | 11 Feb 2026 | | [What are Triads?](/document/130641/download) | 11 Dec 2025 | | [TNUoS Guidance for Generators](/document/138046/download) | 2 Sep 2025 | | [Guidance - TNUoS Onshore Locational Security Factor](/document/183406/download) | 7 Aug 2025 | | [Guidance - TNUoS modelling for 3 ends HVDC circuits](/document/189146/download) | 6 Aug 2025 | | [TNUoS in 10 minutes](/document/130271/download) | 25 Jul 2025 | | [TNUoS for new suppliers](/document/135056/download) | 22 Jul 2025 | | [T and T Model Training Videos](/document/275706/download) | 22 Jul 2025 | #### Pagination * [Current page 1](?page=0 "Current page") * [Page 2](?page=1 "Go to page 2") * [Next page](?page=1 "Go to next page") * [Last page](?page=1 "Go to last page") ## BSUoS guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [BSUoS Data Sources - March 2025](/document/346736/download) | 9 Apr 2025 | | [Introduction to Balancing Services Use of System Charges - February 25](/document/356956/download) | 11 Mar 2025 | ## Connection charging guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [A Guide to Connection Charges](/document/148276/download) | 17 Sep 2025 | | [Customer Charge Modeller 2025/2026 (XLS)](/document/154931/download) | 2 Apr 2025 | | [Application Fee Calculator (2025/26)](/document/358461/download) | 1 Apr 2025 | | [Guide to Termination Amounts](/document/300376/download) | 25 Mar 2025 | | [Ad-hoc Charges Guide](/document/143736/download) | 25 Mar 2025 | ## AAHEDC guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [A guide to AAHEDC charges](/document/134956/download) | 25 Mar 2025 | ## General charging guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Introduction to Transmission Losses](/document/352996/download) | 26 Jan 2026 | | [Revenue & Charging Forum 2025 Q&A](/document/371696/download) | 10 Nov 2025 | | [Basic overview of our electricity charges](/document/138176/download) | 20 Oct 2025 | | [Revenue & Charging Forum 2025](/document/369096/download) | 3 Oct 2025 | | [TNUoS-BSUoS Non Final Demand Declaration Guidance Note](/document/276541/download) | 22 Jul 2025 | ## STAR Billing System Guidance | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [AAHEDC CSV File Specification - STAR Release v2.03](/document/282311/download) | 18 Mar 2026 | | [BSUoS CSV File Specification - STAR Release v1.8](/document/350971/download) | 18 Mar 2026 | | [Connections CSV File Specification - STAR Release v1.03](/document/298596/download) | 18 Mar 2026 | | [TNUoS CSV File Specification - STAR Release v8.03](/document/363466/download) | 18 Mar 2026 | ## Archive documents | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [TNUoS CSV File Specification - STAR Release v7.0](/document/362841/download) | 16 Jun 2025 | ## Archive documents | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [BSUoS CSV File Specification - STAR Release v1.5](/document/322531/download) | 10 Dec 2024 | | [Revenue & Charging Forum 2024](/document/345951/download) | 17 Oct 2024 | | [NESO Revenue and Charging Forum 2024 Q&A](/document/345841/download) | 16 Oct 2024 | | [TNUoS CSV File Specification - STAR Release v5.0](/document/321991/download) | 29 Jul 2024 | ## Archive forum materials | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Revenue and Charging Forum 2023](/document/291041/download) | 20 Oct 2023 | ## Archive documents | [Name](?order=title&sort=asc "sort by Name") | [Published](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [TNUoS CSV File Specification - STAR Release v3.0 1](/document/301726/download) | 2 Feb 2024 | | [TNUoS Demand CSV File Specification - STAR Release v2.1](/document/286316/download) | 22 Aug 2023 | | [AAHEDC CSV File Specification - STAR Release v1.2.1](/document/282306/download) | 23 Jun 2023 | | [TNUoS CSV File Specification - STAR Release v1.1.1](/document/282301/download) | 23 Jun 2023 | | [Guidance - Calculation of the Generator TNUoS Adjustment Tariff for the purposes of the Limiting Regulation 2023/24](/document/275816/download) | 2 Feb 2023 | ## Archive forum materials | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Revenue and Charging Forum 2022](/document/269451/download) | 25 Oct 2022 | ## Archive forum materials | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Charging Forum - Questions and Answers](/document/157491/download) | 29 Nov 2019 | | [Workshop tool - Demand reconciliation calculator](/document/155126/download) | 24 Oct 2019 | | [Workshop tool - Forecasting performance variation (FPVAR) calculator](/document/155136/download) | 24 Oct 2019 | | [Workshop slides - Forecasting performance variation (FPVAR)](/document/155246/download) | 24 Oct 2019 | | [Workshop tool - Generation reconciliation calculator](/document/155131/download) | 24 Oct 2019 | | [Workshop slides - How and why we reconcile your TNUoS charges (generation)](/document/155241/download) | 24 Oct 2019 | | [Workshop slides - How and why we reconcile your TNUoS charges (demand)](/document/155236/download) | 24 Oct 2019 | | [Charging Forum - Glossary of terms](/document/154856/download) | 18 Oct 2019 | | [TNUoS Wider Tariffs handout](/document/154851/download) | 18 Oct 2019 | | [Workshop slides - Connection Charges Explained](/document/154846/download) | 18 Oct 2019 | #### Pagination * [Current page 1](?page=0 "Current page") * [Page 2](?page=1 "Go to page 2") * [Next page](?page=1 "Go to next page") * [Last page](?page=1 "Go to last page") ## Archive forum materials | [Name](?order=title&sort=asc "sort by Name") | | --- | | [TNUoS tariffs and forecasting (includes link to recorded webinar)](/document/150461/download) | | [TNUoS charging and billing (includes link to recorded webinar)](/document/150456/download) | | [BSUoS reporting and forecasting (includes link to recorded webinar)](/document/150451/download) | | [BSUoS billing (includes link to recorded webinar)](/document/150446/download) | | [Your questions answered - from the October 2018 Forums](/document/129456/download) | | [Charging and Settlement Forum Generation-focused Day Slides 17 October 2018](/document/128346/download) | | [Charging and Settlement Forum Demand-focused Day Slides 16 October 2018](/document/128341/download) | Charging Statements The charging statements describe our charges and the methodologies behind them. Further information on the methodologies that underpin the charging statements can be found in two statements: * The Use of System Charging Methodology Statement and the Connection Charging Methodology Statement. * These statements are both included within Section 14 of the [Connection and Use of System Code (CUSC)](/industry-information/codes/connection-and-use-system-code-cusc). Current Charging Statements Archive Current Charging Statements Archive ## Current Charging Statements | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Charging Statement Issue 7.4 - Sep 2025](/document/367581/download) | 3 Oct 2025 | ## Archive | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Charging Statement Issue 7.2 - Jun 2025](/document/362701/download) | 12 Jun 2025 | | [Charging Statement Issue 7.1 - Jun 2025](/document/362106/download) | 3 Jun 2025 | | [Charging Statement Issue 7 - April 2025](/document/358456/download) | 1 Apr 2025 | | [Charging Statement Issue 6 Revision 0 - April 2024](/document/315656/download) | 28 Mar 2024 | | [Charging Statement Issue 5 - April 2023](/document/278386/download) | 31 Mar 2023 | | [Charging Statement Issue 4 Revision 1 - August 2022](/document/265661/download) | 18 Aug 2022 | | [Charging Statement Issue 4 Revision 0 - April 2022](/document/248161/download) | 1 Apr 2022 | | [ESO Charging Statement Issue 3 Revision 0 - 1 April 2021](/document/189631/download) | 13 Apr 2021 | | [ESO Charging Statement Issue 2 Revision 0 - 1 April 2020](/document/166416/download) | 30 Mar 2020 | | [ESO Charging Statement Issue 1 Revision 3 - 1 April 2019](/document/140751/download) | 21 Oct 2019 | #### Pagination * [Current page 1](?page=0 "Current page") * [Page 2](?page=1 "Go to page 2") * [Page 3](?page=2 "Go to page 3") * [Next page](?page=1 "Go to next page") * [Last page](?page=2 "Go to last page") Charging policy developments In this section you will find consultation documents and policy developments and decisions. The methodology we use to set tariffs and calculate charges is in the [Connection and Use of System Code (CUSC)](/industry-information/codes/connection-and-use-system-code-cusc), Section 14. Charging methodology policy decisions Open letters, consultations and notices Tertiary Open Letter Charging methodology policy decisions Open letters, consultations and notices Tertiary Open Letter ## Charging methodology policy decisions Rich text These are policy decisions documents relating to TNUoS charging methodology that are not codified within the CUSC. | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [TNUoS Onshore Locational Security Factor Consultation - Decision](/document/183816/download) | 4 Jan 2021 | | [Open letter responses](/document/96096/download) | 23 Oct 2017 | | [Inv Ahead of TEC Guidance Document V1\_0-V2\_0 track changes](/document/96091/download) | 23 Oct 2017 | | [Inv Ahead of TEC Guidance Document V2\_0](/document/96086/download) | 23 Oct 2017 | | [Inv Ahead of TEC Guidance Document V2.0 draft](/document/88271/download) | 7 Aug 2017 | | [Delay Charge Open Letter](/document/50386/download) | 24 Jun 2015 | | [Investment Ahead of TEC Guidance Document](/document/50391/download) | 24 Jun 2015 | ## Open letters, consultations and notices Rich text These documents are open letters and informal consultations relating to TNUoS charges. | [Name](?order=title&sort=asc "sort by Name") | [Published Sort ascending](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [TNUoS Onshore Security Factor Consultation Responses - Non Confidential (ZIP)](/document/183826/download) | 4 Jan 2021 | | [TNUoS Onshore Locational Security Factor Consultation Analysis (Excel)](/document/183821/download) | 4 Jan 2021 | | [TNUoS Onshore Locational Security Factor Consultation](/document/183811/download) | 4 Jan 2021 | | [Important update for those who pay securities](/document/135426/download) | 21 Dec 2018 | | [Compliance with European Regulation 838/2010 Open Letter](/document/115801/download) | 30 May 2018 | | [Reflecting variations in Offshore Transmission Owner (OFTO) revenue in Offshore Local TNUoS Tariffs\_v2](/document/94076/download) | 19 Sep 2017 | | [Guidance on the impact of Locational Transmission losses on transmission charges](/document/48626/download) | 4 Jul 2017 | | [Guidance on how transmission connected storage is currently charged today](/document/50456/download) | 2 Mar 2017 | | [Potential Transmission Charging Arrangements at Exporting Grid Supply Points - Update letter](/document/50441/download) | 4 Nov 2016 | | [Consolidated responses to open letter consultation](/document/49881/download) | 19 Nov 2015 | #### Pagination * [Current page 1](?page=0 "Current page") * [Page 2](?page=1 "Go to page 2") * [Page 3](?page=2 "Go to page 3") * [Next page](?page=1 "Go to next page") * [Last page](?page=2 "Go to last page") ## Tertiary Open Letter | [Name](?order=title&sort=asc "sort by Name") | [Published](?order=field_publication_date&sort=asc "sort by Published") | | --- | --- | | [Tertiary Open Letter 2020](/document/177181/download) | 28 Sep 2020 | ## More from charging ### [Charging Futures](/industry-information/charging/charging-futures) [](/industry-information/charging/charging-futures) One place for electricity network users to learn, contribute and shape the reform of GB's electricity network access and charging arrangements. ### [Contact charging](/industry-information/charging/contact-charging) [](/industry-information/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](https://neso.createsend.com/h/d/918820CF9659BD06) [](https://neso.createsend.com/h/d/918820CF9659BD06) Join our mailing list to receive publication updates, invitations to our forums, webinars and workshops, and links to our latest guidance materials. ## Footer * [About NESO](/about-neso) + [Who we are](/about/our-people) + [Operational information](/about/operational-information) + [Careers](/careers) + [Applications, portals and APIs](/applications-portals-and-apis) * [Contact us](/contact-us) + [How to report a power cut](/energy-outages) + [Help centre](https://portal.nationalenergyso.com/nesoHelpCentre/s/) + [Media centre](/news-and-events/media-centre) * [Corporate information](/corporate-information) + [Suppliers](/suppliers) + [Freedom of Information and Environmental Information Regulations](/corporate-information/freedom-information-and-environmental-information-regulations) + [Modern Slavery Statement](/corporate-information/modern-slavery-statement) + [Public Sector Equality Duty (PSED)](/corporate-information/public-sector-equality-duty-psed) ## Site * [Accessibility](/accessibility) * [Privacy notice](/privacy-notice) * [Cookie policy](/cookie-policy) * [Terms and Conditions](/terms-and-conditions) * [Security](/security) * [Responsible Disclosure](/responsible-disclosure) ## Social * [Twitter](https://x.com/NESO_energy) * [LinkedIn](https://www.linkedin.com/company/neso-energy) * [YouTube](https://www.youtube.com/%40NESO_energy)  logo--facebook