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What the guide covers

TNUoS — Transmission Network Use of System — is the charge that recovers the cost of building  and operating the national high-voltage electricity grid. 

From 1 April 2026, it rose by an average of 62% for commercial sites. For some manufacturers, that means an additional £40,000–£80,000 on this year’s electricity bill.

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This guide explains what TNUoS is, why it rose, and what your business should check right now.

 

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What TNUoS is and how it appears on your bill

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Why charges rose 62% in April 2026

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The North-South geographic divide

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How your charging band is calculated

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Triads: the charge you can still manage

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Six actions to take right now

 

Download the guide now

 Instant Access to Our TNUoS Explained Guide

 

Want to go further?

The guide tells you what to look for. A Tritility review tells you what it means for your specific sites — your band, your zone, your contract treatment, and your exposure through to 2031. It’s free and takes one conversation.

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