Transmission Network Use of System (TNUoS) charges
Transmission Network Use of System (TNUoS) charges recover the cost of installing and maintaining the transmission system in England, Wales, Scotland and Offshore.
How am I charged?
|Charged according to your TEC (Transmission Entry Capacity)||Charged based on your 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.
Dates of our next publications and webinars
Whenever we publish our forecasts and five-year views of tariffs, we hold webinars to talk through the documents and take your questions.
TNUoS Tariff Report
Date of Publication
Date of Event
2020/21 – 2023/24 5 Year Forecast
Mid September 2018
Thursday 20 September 10:00-11:00am
2019/20 Draft Tariffs
End of November 2018
Wednesday 12 December 10:30-11:30am
|Webinar and slides|
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||Webinar||Thursday 4 April 13:30-14:30pm||Webinar and slides|
TNUoS tariffs and notifications of changes
These documents 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
TNUoS Tariff Model
(DCLF ICRP Transport Model)
We publish the DC Load Flow Investment Cost Related Pricing (DCLF ICRP) Transport Model which allows users to undertake their own sensitivity analysis of generation and demand tariffs under different scenarios.
If you'd like a copy of the DCLF ICRP Transport Model, contact us.
For more detailed information on the DCLF ICRP, please see Chapter 2 of The Statement of the Use of System Charging Methodology in Section 14 of the CUSC.
Get involved in our TNUoS Tariff Model Training sessions
We run regular in-house training sessions, to give participants hands-on experience at changing the model inputs and generating their own scenarios.
Who are the sessions aimed at?
Users who have some understanding of the TNUoS tariffs, and have little or no previous experience at using the DCLF-ICRP model.
Our sessions run from 10:00am-2:00pm.
Use the links below to register (password is NGeso504_001)
|Thursday 9 May||Register|
|Wednesday 14 August||Register|
|Thursday 19 September||Register|
ETYS App F and G data
To view the latest Transmission entry capacity (TEC) register please refer to the Registers, reports, and guidance page.
Generation zoning reviews
We undertake reviews of generation tariff zones at the start of the Price Control period unless there is a significant change in the generation background. These documents contain consultation details of previous reviews.
The charging statements describe our charges and the methodologies behind them. The Use of System Charging Methodology Statement and the Connection Charging Methodology Statement are included within Section 14 of the Connection and Use of System Code (CUSC).