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

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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
Balancing Services Use of System (BSUoS) charges

The BSUoS charge recovers the cost of day-to-day operation including the cost of balancing the electricity transmission system.
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Tariff Model (TNUoS)

Transmission Network Use of System (TNUoS) charges recover the cost of installing and maintaining the transmission system in England, Wales, Scotland and Offshore.
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The charges for using Great Britain’s electricity system

All users of the electricity transmission system pay to use it. This brief overview looks at who pays, for what, and how the charges are calculated.
Triads Data

On this page you will find all of the Triad data documents as well as links to guidance materials. Triads are the three half-hour settlement periods with highest system demand.
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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.
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Assistance for Areas with High Electricity Distribution Costs (AAHEDC)

AAHEDC recovers costs for The North of Scotland which is currently the only area specified to receive assistance.
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Connection charges

Connection Charges recover the cost of installing and maintaining connection assets which connect individual users to the GB Transmission Network.
Charging guidance

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
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Charging policy developments

On this page you will find consultation documents and policy developments and decisions.
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Charging statements

The charging statements describe our charges and the methodologies behind them.
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Contact Charging

Need to talk to us about own-bills, forecast costs or the calculation of the billing methodology? Get in touch with the relevant team
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Get involved with charging

Depending on whether you’re interested in how charges work now, or how they should work in the future; here we share the ways you can get involved in charging through forums, code modific
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Submit a charging query

If you have a query related to charging, please use the form below and we'll get back to you within the next business day.
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