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Additional Supplier Pricing

This section provides clarity on additional charges introduced industry-wide in late 2025. These are not supplier-specific fees, but regulated costs set across the UK energy market. Depending on the supplier and contract type, these charges may already be included in your unit rate, added as a separate charge, or reviewed once final costs are confirmed.

Energy Pricing

 

Here, are more details about RAB and TNUoS charges:

Nuclear RAB (Regulated Asset Base)

RAB is a government-approved charge that helps fund new national energy infrastructure, such as nuclear generation.

Suppliers recover this cost either:

  • by including it within the unit rate paid for electricity, or
  • by showing it as a separate line item on the bill.

 TNUoS (Transmission Network Use of System) 

  • TNUoS covers the cost of transporting electricity across the national grid.
  • These charges are set annually and can vary by year. Some suppliers build them into prices in advance, while others may review them once final figures are confirmed.

How does this affect your customer contracts:

Option A – Charges included in the price
  • The quoted price already allows for RAB and/or TNUoS.
  • This means there is no separate charge for these items, and they are already reflected in your agreed unit rates.
Option B – Separate or pass-through charge
  • The supplier may apply RAB and/or TNUoS as a separate charge if and when industry costs are confirmed.
  • If this applies, it will be clearly shown on the bill and is not a discretionary supplier increase.
Option C – Review once confirmed
  • Some suppliers are waiting for final industry confirmation before deciding whether any adjustment is required.
  • If changes are made, customers will be informed in advance.

Top Tip: You can use the following re-assuring statements when speaking to your customers about these changes:

  • “This isn’t a price rise from the supplier – it’s a regulated industry charge.”
  • “Some suppliers include it in the rate, others show it separately.”
  • “We’ve explained upfront how your chosen supplier treats these costs.”