What is Nuclear Regulated Asset Base scheme (RAB)?
Nuclear RAB is a scheme regulated by Ofgem, designed to accrue revenue for nuclear projects across the UK. The scheme is currently specified for funding the Sizewell C nuclear power plant. More information on the Nuclear RAB can be found at www.ofgem.gov.uk/energy-policyand-regulation/policy-and-regulatory-programmes/nuclear-regulated-asset-base-rabmodel
When will this take effect?
The Nuclear RAB levy has now been confirmed to start in November 2025.
How will it affect me?
As part of the scheme, a new Nuclear RAB levy will be introduced to fund these investments. The Nuclear RAB levy will be a new charge, an for our fixed customers this charge will be included within your unit rate. However for those customers on a pass through contracts this new charge will function in a way that is similar to the CfD FiT. It will be a consumption-based rate, set by the Low Carbon Contracts Company LCCC, and we anticipate this will vary quarterly.
What will I see on my bill?
For pass through customers you will see an additional line item on your invoice for the Nuclear RAB charge, which will be reconciled quarterly.
How will I be charged?
Although the charge will come into effect from November 2025 there will be no costs showing on invoices until January 2026, for December 2025 consumption for our pass through customers
Below are the current costs for December 2025 and the forecasted costs for January-March 2026:
| Month | p/kWh |
| December 2025 | £ 0.3540 |
| January – March 2026 | £ 0.3720 |
When will the Nuclear RAB charges be reconciled?
Nuclear RAB will be reconciled once per quarter, with the first reconciliation taking place by the end of April 2026, covering the delivery periods for January-March 2026.
How does the NCC affect us if we are an EII customer?
If you are an EII customer and hold a valid EII exemption certificate you won’t have to pay this levy.
