These pages contain details about the charges that users of the electricity transmission system have to pay, how they are calculated and what changes are currently being considered by the industry.

What is charging?

There are four different types of charge which we bill our customers. You might be liable to pay one - or all of them, depending on the type of transmission user you are.

Why does charging exist?

Our charges exist to recover the costs of installing and maintaining as well as the day-to-day and the day-to-day operation of the transmission system. There are also charges relating to the installation and maintenance of connection assets and assistance for areas with high electricity distribution costs


New to Charging?

We have a wide range of guidance documentation and webinars to help those new to our charges and wanting to gain further insight

Charging Guidance

Summary of Charges

Use the links below for further information on our charges


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.


Transmission Network Use of System (TNUoS) charges

TNUoS recovers the cost of installing and running the transmission network. These charges apply to suppliers and generators.


Electricity connection charges

Connection Charges recover the cost of installing and maintaining connection assets.


Assistance for Areas with High Electricity Distribution Costs (AAHEDC)

AAHEDC charges recovers assistance costs for the north of Scotland which is currently an area specified to receive assistance. These charges apply to suppliers.

Looking for data and reports?

Access charging related data that we publish on a regular basis


Triads Data

Triads are the three half-hour settlement periods with highest system demand. Learn more about Triads and access related data and guidance materials.


Industry Data and Reports

Contains data and support for users of the National Electricity Transmission System (NETS). Here you will find the latest operational data, forecasts, and reports.


Data Portal

Use the ESO Data Portal to gain access to TNUoS tariff datasets that are geared towards API compatibility, providing additional flexibility to end users of tariff data.

More information about charging


Contact us

See contact details for our Charging team who are on hand to answer any questions you may have.


Looking for domestic charges?

We don’t supply homes or other domestic properties. If you have a query about your home or non-industrial property, you’ll need to contact your local distribution network operator (DNO).

Get involved in the future of charging

Get essential guidance, discover how you can get involved and learn more about the latest charging developments


Charging guidance

Access a range of guidance materials to help you understand how, when and what you’ll be charged.


Get involved with charging

You can join our forums or suggest code modifications to help us improve the way that charges are considered by the industry.


Join our mailing list

Join our mailing list to receive publication updates, invitations to our forums, webinars and workshops, and links to our latest guidance materials.

Sign up