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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.

TNUoS for new suppliers   TNUoS for generators 

TNUoS charging and billing timeline

 

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.

Join our mailing list

TNUoS Enquiries

For TNUoS queries please contact us by email.
Phone lines are not currently manned 
due to COVID-19 homeworking.

Email: [email protected]

Charging guidance

Our Charging guidance page will give you the guidance materials to help you understand how, when and what you'll be charged. 

More about charging guidance

 

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 Tariff Report

Date of Publication

Date of Webinar

Webinar Links
2021/22 November Draft TariffsEnd of November 2020

Thu 10 Dec 2020

Webinar and slides
2021/22 - 2025/26 5 -Year ViewEnd of August 2020Wed 23 Sept  2020 Webinar and slides
2021/22 March Forecast TariffsEnd of March 2020(Pre-Recorded Webinar) Thu 9 Apr 2020Webinar and slides
2020/21 Final TariffsEnd of January 2020Thu 6 Feb 2020Webinar and slides

 

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. 

Triads data

To view Triads data, go to the Triads data page. 

Find out more

Charging statements

Find out more and see our latest charging statement by visiting our charging statements page 

Go to the charging statements page
2021/22 charging year tariff forecasts2020/21 charging year tariff forecasts2019/20 charging year tariff forecasts2018/19 charging year tariffsTariff forecasts archiveTariff change notificationsHistorical tariffs

2021/22 charging year tariff forecasts

Published Sort ascending Name
21 Dec 2020TNUoS Onshore Locational Security Factor Consultation - Decision
30 Nov 2020Draft ALFs for 2021-22
30 Nov 2020November Draft TNUoS Tariffs for 2021-22 - Tables
30 Nov 2020November Draft TNUoS Tariffs for 2021-22 - Report
9 Apr 20202021-22 March Forecast (Sensitivities) - Generation Zones Site/Node Map
9 Apr 2020March Initial Forecast TNUoS Tariffs for 2021-22 - Webinar slides and recording
1 Apr 2020March Forecast TNUoS Tariffs for 2021-22 - Report - Updated
1 Apr 2020March Forecast TNUoS Tariffs for 2021-22 - Tables - Updated
31 Jan 2020Timetable of TNUoS forecasts for 2021-22
14 Jan 2020TNUoS Tariff Forecast Timetable Consultation
10

2020/21 charging year tariff forecasts

Published Sort ascending Name
4 Mar 2020Final TNUoS Tariffs for 2020-21 - Report - Updated
13 Feb 2020TNUoS 2020-21 Final Tariff Webinar
31 Jan 2020Final TNUoS Tariffs for 2020-21 - Tables
14 Dec 2019November Draft TNUoS Tariffs for 2020-21 - Webinar slides and recording
29 Nov 2019November Draft TNUoS Tariffs for 2020-21 - Report
29 Nov 2019Final ALFs for 2020-21
29 Nov 2019November Draft TNUoS Tariffs for 2020-21 - Tables
25 Oct 2019Draft ALFs for 2020-21
15 Aug 2019July Forecast TNUoS Tariffs for 2020-21 - Webinar slides and recording
31 Jul 2019July Forecast TNUoS Tariffs for 2020-21 - Report
31 Jul 2019July Forecast TNUoS Tariffs for 2020-21 - Tables
24 Jan 2019Timetable of TNUoS forecasts for 2020-21
12

2019/20 charging year tariff forecasts

Name
Final TNUoS Tariffs for 2019-20 – Report
Final TNUoS Tariffs for 2019-20 – Tables
Draft Forecast TNUoS Tariffs for 2019-20 - Webinar slides and recording
Draft Forecast TNUoS Tariffs for 2019-20 – Report
Draft Forecast TNUoS Tariffs for 2019-20 - Tables
Final ALFs for 2019-20
Draft ALFs for 2019-20
June Forecast TNUoS Tariffs for 2019-20 - Webinar slides and recording
June Forecast TNUoS Tariffs for 2019-20 - Report
June Forecast TNUoS Tariffs for 2019-20 - Tables
April Forecast TNUoS Tariffs for 2019-20 - Report
April Forecast TNUoS Tariffs for 2019-20 - Tables
Timetable of TNUoS forecasts for 2019-20
13

2018/19 charging year tariffs

Published Sort ascending Name
12 Mar 2018Information on a Potential Mid-Year Charge Change - 2018-19
31 Jan 2018Final TNUoS Tariffs for 2018-19 - Tables
31 Jan 2018Final TNUoS Tariffs for 2018-19 - Report
25 Jan 2018Final ALFs 2018-19
21 Dec 2017Draft TNUoS Tariffs 2018-19 - Tables
21 Dec 2017Draft TNUoS Tariffs for 2018-19 Report
8 Dec 2017Customer Update - CMP261 Appeal December 2017
27 Nov 2017Customer Seminar Slides - November 2017
31 Oct 2017October TNUoS Tariffs 2018-19 - Tables
31 Oct 2017October Forecast TNUoS Tariffs for 2018-19 Report
31 Oct 2017CMP 264 - 265 - BSC Modifications P348-P349 - Summary of Historical Gross Demand Data
26 Oct 2017CMP264-265 Implementation Guide
18 Oct 201720171012 150 Day Notice for 2018-19 TNUoS
3 Oct 2017CMP 264-265 AGIC Value for 2018-19
6 Sep 2017Draft ALFs for 2018-19
6 Jul 2017Quarterly Forecast 2018-19 - June 2017
30 Jun 2017Quarterly Forecast 2018-19 - June 2017 - Tables
21 Jun 2017Revised Timetable of TNUoS Tariff Forecasts for 2018-19
18

Tariff forecasts archive

Published Sort ascending Name
31 Jan 2017Final tariffs 2017-18 v1
25 Jan 2017Final ALFs Report for 2017-18
2 Jan 2017Final Tariffs 2017-18 - Tables EXTERNAL
22 Dec 2016DRAFT Dec Forecast 2017-18 - Tables EXTERNAL
22 Dec 2016December Quarterly Update 2017-18
31 Oct 2016Quarterly Update 2017-18 October 2016
31 Oct 2016Quarterly Forecast 2017-18 - October 2016 Tables
12 Sep 2016Draft ALFs for 2017-2018
30 Jun 2016Quarterly Forecast 2017-18 - June 2016 Tables
30 Jun 2016Quarterly Update 2017-18 June 2016
29 Jan 2016Final Tariffs for 2016-17 V1_0
29 Jan 2016Final ALF for 2016-17
29 Jan 2016Timetable of 2017-18 TNUoS Forecasts
29 Jan 2016Final Tariffs for 2016-17 V1_0 - Tables
21 Dec 2015Draft Tariffs for 2016-17 V1_0
21 Dec 2015Draft Tariffs for 2016-17 V1_0 - Tables
25 Nov 2015Quarterly Update 2016-17 November 2015 V1_1
25 Nov 2015Quarterly Forecast 2016-17 November 2015 V1_1 - Tables
10 May 2015Quarterly Update 2014-15 Final November v1_1
10 May 2015Draft TNUoS Tariffs in 2014-15

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Tariff change notifications

Published Sort ascending Name
28 Oct 2020150 Day Notice for 2021-22 Charges
17 Oct 2019150 Day Notice for 2020-21 Charges
23 Oct 2018150 Day Notice for 2019-20 Charges
12 Oct 2017150 Day Notice for 2018-19 Charges
21 Jun 2017150 Day Notice for 2017-18 Charges
29 Oct 2015150 Day Notice for 2016-17 Charges
29 Oct 2014150 Day Notice for 2015-16 Charges
11 Jun 2013150 Day Notice for 2014-15 Charges
10 Feb 2013Notice of Mid Year Tariff Change
10 Feb 2013150 Day Notification for 1 April 2007
10 Feb 2013Mid year Tariff Change further info
10 Feb 2013150 Day Notification for1April08
10 Feb 2013150 Day Notification for 1 April 2012
10 Feb 2013150 Day Notification for 1 April 2010
14

Historical tariffs

Name Sort descending
TNUoS Tariffs 2005-06 to 2019-20
1
Five-year viewsFive-year views archive

Five-year views

Published Sort ascending Name
20 Jan 2021 August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Tables (Updated 14/01/2021)
2 Oct 2020August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Additional Tables
23 Sep 20202021-25 August 5YV TNUoS Tariff Webinar & Recording
15 Sep 2020August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Tables (Updated 02/10/2020)
15 Sep 2020August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Report (Updated 15/09/2020)
31 Aug 2020August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Tables
31 Aug 2020August Forecast TNUoS Tariffs - Five-Year View (2021/22 to 2025/26) - Report
5 Apr 2019TNUoS Forecast from 2020-21 to 2024-25 – Webinar slides and recording
29 Mar 2019TNUoS Forecast from 2020-21 to 2024-25 - Tables
29 Mar 2019TNUoS Forecast from 2020-21 to 2024-25 - Report
14 Sep 2018Forecast from 2019-20 to 2023-24 - Tables
14 Sep 2018Forecast from 2019-20 to 2023-24
19 Jun 2018Open Letter on our proposed approach for August 2018 Five-Year View of TNUoS
13

Five-year views archive

Published Sort ascending Name
1 Dec 2017Forecast From 2018-19 to 2022-23 - Tables
1 Dec 2017Forecast From 2018-19 to 2022-23
2 Sep 20172017-2018 TNUoS Forecast Timetable
20 Mar 2017Forecast From 2017-18 to 2021-22 - Tables - with CMP264_265 Calculator
28 Feb 2017Forecast From 2017-18 to 2021-22
28 Feb 2017Forecast From 2017-18 to 2021-22 - Tables
2 Oct 2016Forecast From 2017-18 to 2020-21
2 Oct 2016Forecast From 2017-18 to 2020-21 Tables
28 Jan 2015Forecast from 2016-17 to 2019-20 Tables
28 Jan 2015Forecast from 2016-17 to 2019-20
30 Jun 2014Forecast from 2014-15 to 2018-19 - Tables
13 May 2014Forecast from 2014-15 to 2018-19
28 May 2013Forecast from 2013-14 to 2017-18
13
Three National Grid workers assessing a number of display screens

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.

Find out more

Two National Grid representatives looking at a span of computer screens

Transmission Network Use of System (TNUoS) Tariff Model

TNUoS recovers the cost of installing and maintaining the transmission system. These charges apply to suppliers and generators.

Find out more

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