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.

TNUoS for new suppliers   TNUoS for generators 

TNUoS charging and billing timeline

Would you like to get involved?

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TNUoS tariffs 

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 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.