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Transmission Network Use of System (TNUoS) charges are used to cover the costs of building, maintaining and upgrading the national transmission network across the country. These charges are not set by us but are calculated by the National Energy System Operator (NESO) and funding is approved by the UK energy regulator, Ofgem.
What is TNUoS?
Total TNUoS cost consists of two charging elements:
- Locational: Cost is based upon your consumption and Grid Supply Point (GSP) rate published by NESO. The charged rate differs based upon your meter type (i.e., Half Hourly and Non-Half Hourly)
- Non-Locational (Residual): This is a fixed charge which is calculated based on a £/day rate differing based on meter type.
TNUoS charges are administered by the National Energy System Operator (NESO), on behalf of transmission network owners and other network schemes. Whilst we as your supplier are not responsible for setting the level of the charge, we are responsible for collecting the costs on behalf of NESO and the transmission network owners.
The amount of revenue that can be collected is set by the UK energy regulator, Ofgem, during regulatory periods known as price control periods.
The current price control period runs from April 2026 to March 2031.
The updated TNUoS charges apply from April 2026, in line with the new regulatory price control period set by Ofgem.
The UK electricity network needs significant investment to support growing electricity demand and the transition to net zero.
To allow for this investment, Ofgem has approved higher revenues for transmission network owners. These funds help upgrade and expand the grid so it can support new technologies such as renewable energy and electrification.
As a result, TNUoS charges are increasing from April 2026.
TNUoS residual cost calculated for the period April 2026 – March 2027 for all contracts sold from April-24 onwards were based on NESO’s April-24 5-year forecast view.
The uplift is therefore the difference between final published £/day fixed charge and NESO’s April-24, 5-year forecast view of 2026/27.
For all contracts sold prior to April-24, we have aligned your baseline sold rate with NESO’s April-24 5-year forecast. This proactive adjustment helps protect customers from higher uplift costs not only for 2026/27 charging period but also future years.
What does it mean for my bill?
You’re current standing charge will be uplifted by the difference observed between priced rate (i.e., NESO’s April-24 5-year forecast view) and latest actual.
If you are on our Standard Fixed Tariff product, there will be no change to the structure of the invoice however you’re Standing Charge will be uplifted.
If you are on our No Standing Charge product, a new line item will be added called “Standing Charge” which will be the additional amount we need to recover.
No, as all demand users are required to pay towards the cost based on their meter connection type.
Businesses with Energy Intensive Industries (EII) are eligible to claim compensation under the Network Charging Compensation Scheme administered by Elexon.
Yes, your uplift has been factored for change in meter band (increase or decrease).
Yes. TNUoS charges are industry-wide network charges, so all electricity suppliers must pay them. This means the increase will affect businesses across the market, regardless of their supplier.
TNUoS charges are reviewed each year and may change depending on network investment requirements and electricity demand.
The amount transmission owners can recover is regulated by Ofgem and administered by the National Energy System Operator. NESO has published future forecasts which you can view for your future budgeting.