Transmission Network Use of System (TNUoS) charges
TNUoS charges recover the cost of installing and maintaining the transmission system in England, Wales, Scotland and Offshore.
How am I charged?
Generators are charged according to TEC (Transmission Entry Capacity). Suppliers are charged based on actual demand.
All tariffs are based on which geographical zone Users are connected to.
TNUoS tariffs are published annually by 31 January and take effect from 1 April each year.
Check out our materials below and for more information on TNUoS and our other charges go to our guidance page.
Would you like to get involved?
Join our mailing list to receive invitations to our forums, webinars and workshops, and links to our latest guidance materials.
Dates of our next publications and webinars
When we publish our forecasts and five-year views of tariffs, we are committed to holding webinars to talk through the documents and take your questions. Below is a table of recent and upcoming webinars.
TNUoS Tariff Report
Date of Publication
Date of Webinar
2019/20 Final Tariffs
End of January 2019
Wednesday 6 February 10:30-11:30am
|2020/21 - 2024/25 5 Year View||End of March 2019||Thursday 4 April 13:30-14:30pm||Webinar and slides|
|2020/21 Quarterly Forecast||End of July 2019||Thursday 8 August 10:30-11:30am||Webinar and slides|
|2020/21 Draft Tariffs||End of November 2019||Thursday 5 December 10:30-11:30am|
|2020/21 Final Tariffs||End of January 2020|
|2021/22 - 2025/26 5 Year View||End of March 2020|
TNUoS tariffs and notifications of changes
The documents below contain the TNUoS tariff forecasts and notifications of tariff changes.
Updates for next year's tariffs are published quarterly in accordance with the Connection and Use of System Code (CUSC).
Updates for the next five years’ tariffs are published annually.
2020/21 charging year tariff forecasts
2019/20 charging year tariff forecasts
2018/19 charging year tariffs
Tariff forecasts archive
Tariff change notifications
Five-year views archive
Balancing Services Use of System (BSUoS) charges
BSUoS recovers the cost of day-to-day operation of the transmission system. These charges apply to suppliers and generators.