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Why this matters right now

TNUoS charges rose by an average of 62% from 1 April 2026, the largest single-year network charge increase in UK history. Every invoice error that existed before April now costs proportionally more. And new errors have been introduced by CMP463, which changed charging band thresholds from the same date.

Invoice discrepancies in business energy bills are more common than most businesses realise. None are obvious without specialist knowledge. All are recoverable if found.

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What a Tritility invoice audit covers

Number1

Your TCR charging band — is it correct, and has CMP463 been applied properly from April 2026?

Number2

Your regional transmission zone — zone misassignment is one of the more commonly found errors.

Number3

Your contract treatment — is TNUoS pass-through or all-in fixed on your current agreement?

Number4

Settlement period gaps — any reconciliation mismatches from meter changes or supplier switches.

One client was overpaying £34,000 a year due to a zone assignment error. The audit took one conversation. The overcharge was recoverable.

 

Arrange your free audit

Fill in your details below and a Tritility specialist will be in touch within one working day to arrange the audit at a time that suits you.

 

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