*This news item was updated on 7 November 2025 to reflect the In Period Adjustment to the Nuclear RAB Interim Levy Rate*
On 7 November 2025, LCCC issued a Stakeholder Bulletin confirming an In Period Adjustment to the Nuclear RAB Interim Levy Rate.
For the period 1 December 2025 to 31 December 2025
- Adjusted Interim Levy Rate is £3.494/MWh
This adjustment has occurred due to a new Revenue Amount Before Power (RABP) value being given to LCCC by Ofgem in relation to Sizewell C commercial signing. Suppliers will receive formal notice to confirm this announcement.
The adjusted Total Reserve Amount of £ 8,307,825.45 is unchanged from the previous announcement on 3 October 2025, and here’s a link to the News LCCC issued.
On the Settlement Data for Suppliers webpage, the Key Payment Figures for 2025/26 have been updated to include the adjusted Nuclear RAB Interim Levy Rate and Total Reserve Amount figures for Q4 2025.
The Operational Costs Levy (OCL) for the Nuclear RAB scheme is set as follows:
- Operational Costs Levy Rate is £0.0028/MWh
The OCL value is confirmed in the Nuclear Regulated Asset Base Model (Revenue Collection) Regulations 2023.
This rate will apply to all settlement dates starting from the 4 November 2025 which is when LCCC entered into the Revenue Collection Contract with Sizewell C. To highlight this milestone LCCC issued this news item – New nuclear project will deliver low carbon power and long-term value for consumers.
What is the process for lodging Credit Cover?
WP42 – Supplier CfD and Nuclear RAB Credit Cover provides details on the process for lodging Credit Cover including the Letter of Credit templates (p43-50) and the approved bank account details for cash Credit Cover (p17).
For Credit Cover to be considered.
- Cash amount must have been received in the relevant bank account;
- Valid Letter of Credit received electronically; and
- Received by 5:00pm on 28 November 2025
If you have already lodged Credit Cover with us using the previous Interim Levy Rate of £3.540/MWh, you may wish to review your Credit Cover in line with the new Interim Levy Rate of £3.494/MWh by 28 November 2025
PLEASE NOTE: The bank account details, and Letter of Credit templates are different to those used for CfD Credit Cover.
On 17 July 2025 we hosted a webinar detailing the process for lodging Credit Cover under the Nuclear RAB scheme. The recording (timestamp 5:56), slide deck, and Q&A for the session are available to download.
How do I calculate my Nuclear RAB Credit Cover?
The minimum Credit Cover requirement is a Supplier’s metered volumes for 21 days reference period multiplied by the Interim Levy Rate. To help, we will first calculate your Credit Cover amount on 1 December 2025 and this will use the reference period as follows:
- 3 November 2025 to 24 November 2025
G5 – Supplier CfD and Nuclear RAB Credit Cover provides further details and an example to illustrate how to calculate your Credit Cover.
How do I keep track of my Credit Cover?
Your Credit Cover balance is available in the latest RAB Supplier Daily Minimum Credit Cover Report data sent to your company email and available to download on My EMRS within ‘Party Data’. Please see item ‘RAB Total Credit Cover’ (data item ‘E0239′) on the report which reflects the Total Credit Cover held (combination of cash and Letter of Credit value) as of the day.
The ‘T File CSV Format Backing Data’ document provides further details of all the other data items within the ‘RAB Supplier Daily Minimum Credit Cover Report’. You can navigate to the Publication section on our website and then select the Interface Definitions from the dropdown menu to locate this document.
Where can I locate more information on Nuclear RAB Credit Cover?
We have summarised information on the Stakeholder Support – Nuclear RAB Supplier webpage and WP42 – Supplier CfD and Nuclear RAB Credit Cover and G5 – Supplier CfD and Nuclear RAB Credit Cover will support you with this process.
When will I receive my invoice for my Reserve Payment?
Suppliers will receive confirmation of their share of the Total Reserve Amount via an invoice issued on 17 November 2025. In line with the 30-day payment terms, payment is due on 17 December 2025.
Where can I locate information on how my Reserve Payment is calculated?
G3 – CfD and Nuclear RAB Reserve Payment provides information on how Suppliers Reserve Payment is calculated.
How do I make my Nuclear RAB payments?
For those making payments via cash, the bank account details will be confirmed on the Nuclear RAB invoices you receive. Please also be aware that your existing Direct Debit mandate with LCCC for the Contracts for Difference scheme, will also be used to collect monies for the Nuclear RAB scheme once operational and you do not need to take any further action.
If you currently pay manually and would like to set up a Direct Debit, please contact our Service Desk.
What are the key dates I need to be aware of?
The table below shows the key dates for the 1 October 2025 to 31 December 2025 Nuclear RAB Quarterly Obligation Period following this announcement.
| Date | Activity |
| 17 November 2025 | Suppliers invoiced for the first Nuclear RAB Total Reserve Amount payment |
| 28 November 2025 | Suppliers invoiced for the first Nuclear RAB OCL payment
Suppliers ensure sufficient Credit Cover lodged for ILR of £3.494/MWh |
| 1 December 2025 | In Period Adjustment to ILR to £3.494/MWh applies |
| 5 December 2025 | Suppliers first OCL payment due |
| 10 December 2025 | Suppliers invoiced for the first Nuclear RAB ILR payment based on £3.494/MWh |
| 17 December 2025 | Suppliers first Total Reserve payment and first Interim Rate payments are due |