Understanding changes to non-energy costs
The UK’s energy landscape is evolving as policy changes, infrastructure investment increases and the transition to cleaner energy reshape the industry. As a result, some non-energy charges that form part of the overall cost of supplying electricity are changing.
These charges help cover the cost of operating, maintaining and developing the UK’s energy infrastructure, so energy can be delivered safely, reliably and sustainably to homes and businesses across the country.
The organisations responsible for these costs review and update them to reflect changes in infrastructure investment, system operation, and government energy policy.
With more renewable generation such as wind and solar, the network needs upgrading so electricity can move efficiently across the country.
At the same time, some industry-wide charges have increased or been introduced to support national energy priorities. These charges are set by government or industry bodies and apply to all energy suppliers, so they sit outside EDF’s control.
The main charges contributing to these changes are outlined below.
Transmission Network Use of System charges (TNUoS)
Set by the National Energy System Operator (NESO) and regulated by Ofgem, this charge helps fund the high-voltage transmission network that carries electricity across the UK.
It helps pay for building, maintaining and upgrading the national grid so electricity generated across the country can reach homes and businesses. As more renewable generation connects to the network and new infrastructure is built, the level of investment required has increased.
Energy Intensive Industry Support Levy (EIISL)
Introduced by the UK Government, specifically the Department for Energy Security and Net Zero (DESNZ), this levy supports UK industries that use large amounts of electricity, such as steel and manufacturing. From 1st April 2026 the level of support from 60% relief to 90%
Nuclear Regulated Asset Base charge (RAB)
Introduced by the UK Government through the Nuclear Energy (Financing) Act 2022, this charge helps fund investment in new nuclear power projects.
Questions and answers about non-energy costs
We want to make it easier for you to get the answers to your questions
Below we have answered some of your most frequently asked questions.
Why are my energy prices increasing?
Some industry-wide non-energy costs have increased or been introduced across the market. These charges help fund national energy priorities such as upgrading the grid, supporting energy-intensive industries and investing in new low-carbon generation.
These costs are set by external organisations and apply to all energy suppliers, so they sit outside EDF’s control but form part of the overall cost of supplying electricity.
Examples include transmission network charges set by the National Energy System Operator and regulated by Ofgem, as well as government-led initiatives to support industry and infrastructure investment.
Is this increase specific to EDF?
No, these changes relate to industry-wide charges that apply across the energy sector.
They are set by organisations such as the UK Government, Ofgem and the National Energy System Operator, and are applied to all suppliers operating in the UK.
Are other suppliers seeing similar changes?
Yes, because these charges are set at an industry level, they affect all energy suppliers. While suppliers may communicate these changes differently depending on their contract terms, the charges themselves are not unique to EDF.
When will this increase affect my bills?
It depends on your contract and billing cycle. If you're unsure how this applies to your account, please contact your Account Manager.
I’m on a fixed contract – does this still apply to me?
Fixed + Peace of Mind remains a fully fixed product and will continue to be.
Fixed + Standard is our standard fixed contract option. This means your wholesale energy price is fixed, while non-energy costs are based on a forecast at the time your agreement is set.
We use the best available information to estimate these costs and aim to keep them as stable as possible. However, because these charges are set externally, they can change. Where they differ significantly from the original forecast, adjustments may be made to reflect the updated costs.
If you have any questions about your contract, please contact your Account Manager.
Where in your terms does it state that you can make these changes?
Your terms and conditions allow for certain charges to be updated where they are set by external organisations and change after your agreement has been put in place.
For example:
Transmission Network Use of System (TNUoS) charges may be updated if the final charges differ from those originally published or estimated.
We may also adjust charges where there are changes to industry arrangements that affect the cost of supplying electricity.
Where applicable, estimates can be reconciled against actual costs once they are confirmed.
In addition, your terms allow for changes where there are updates to government-led charges or levies, such as:
the Nuclear Regulated Asset Base (RAB) charge
the Energy Intensive Industry (EII) support levy
These types of charges are introduced or updated by government and applied across the energy industry.
If you’d like more detail on how these terms apply to your agreement, your EDF Account Manager will be happy to help.
Can I arrange a payment plan if I need support?
If you’re concerned about managing your bills, please get in touch with us as soon as possible.
Our team will look at your situation and discuss what support options may be available to help you manage your payments.
We’re here to help you
Get in touch with your Account Manager to discuss how these changes may affect your energy costs.