Skip to main contentThe latest forecasts for Transmission Network Use of System (TNUoS) tariffs show significant increases from April 2026. These figures are forecasts only: the next update will be released in November 2025, with final tariffs confirmed in January 2026.
What Are TNUoS Charges?
TNUoS charges are designed to recover the cost of operating, maintaining, and expanding the transmission network across England, Wales, Scotland, and offshore. Suppliers pass these costs on to both domestic and non-domestic customers through their electricity bills.
Why is this Increase Happening?
The rise is primarily driven by the scale of investment needed to upgrade the electricity grid to support more renewable generation.
TNUoS charges raise revenue for Transmission Owners (TO) in Great Britain. TOs are the companies responsible for owning, operating and maintaining high-voltage electricity transmission infrastructure, such as pylons and substations.
The government is providing the TOs with substantial short term funding to enable the required upgrades to the network with the aim of lowering costs in the long term.
When will TNUoS price rises take effect?
This forecast covers the charging period from 2026/27 through to 2030/31. It does not affect the charging year 2025/26.
What this means for businesses
For all business energy users, the increases will impact standing charges – the fixed part of the electricity bill. This means businesses may face higher costs regardless of how much energy they consume. Budgeting, forecasting, and procurement strategies should take these changes into account.
Envantage will continue monitoring these forecasts and their implications for our clients. If you’d like advice on how rising TNUoS charges could affect your business, get in touch with our team
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