You may have heard about the upcoming Nuclear RAB charges and the recent updates to TNUoS charges but what do they actually mean, how will they affect your business, and what is Dyce Energy doing about them?
Let’s break it down.
What are Nuclear RAB charges?
The Regulated Asset Base (RAB) model is a government-approved financing framework designed to attract private investment into large-scale infrastructure projects such as the Sizewell C nuclear power station.
Under this model, investors receive a predictable revenue stream from energy consumers via their monthly bills, both during construction and once the project becomes operational. This approach helps fund essential low-carbon infrastructure while ensuring investors have a stable return over time.
How will Nuclear RAB charges affect your business?
The new Nuclear RAB charges will appear within your energy bill as a regulated contribution toward the construction of new nuclear power plants. These charges are designed to support the UK’s long-term energy stability and security, ensuring a reliable, low-carbon supply for decades to come.
Unlike wholesale energy costs, these charges don’t fluctuate with market prices. They include elements such as Interim and Operational Levies, which are overseen by the Low Carbon Contracts Company (LCCC).
The LCCC recently confirmed that the Operational Costs Levy (OCL) for the Nuclear RAB scheme has been set at £0.0028/MWh.
What are TNUoS charges?
TNUoS (Transmission Network Use of System) charges cover the costs of building, maintaining, and operating the UK’s electricity transmission network, the high-voltage system that transports power from generators to local distribution networks across the country.
While suppliers and generators connected to the transmission network are directly billed for these costs, they’re ultimately passed through to consumers as part of energy bills.
How will TNUoS charges affect your business?
TNUoS charges are expected to increase significantly over the next few years, meaning many businesses will see higher standing charges.
The National Energy System Operator (NESO) has forecasted a 90% rise in TNUoS costs for 2026/27, compared to 2025/26 levels.
Although the new charges aren’t due to take effect until April 2026, the exact figures haven’t yet been confirmed.
- Draft proposals are expected by 30th November 2025
- Final amounts will be published by Ofgem by the end of January 2026
What is Dyce Energy doing about it?
While some suppliers are still deciding how to handle these changes, we’re keeping it simple.
If you sign a fixed-rate contract with Dyce Energy before the end of 2025, your rates will stay the same, regardless of any increases in TNUoS or Nuclear RAB charges.
When we say fixed rate, we mean it.
If your contract renewal is approaching, speak to our team today:
- 📞 Call us on 01709 357315
- 📧 Email us at tpi@dyce-energy.co.uk
- 💻 Or complete our quick online form here
*For more information on Nuclear RAB charges, check out our dedicated blog.
**To stay up to date on the latest TNUoS updates, visit the NESO and Ofgem websites.
