Nuclear Regulated Asset Based Bulletin

Following LCCC’s October 2025 bulletin sent on 3 October, the update to the Revenue Commencement date for Nuclear RAB, LCCC has determined the ILR/TRA for:

• In Period Adjustment for Q4 2025
• Q1 2026

ILR and TRA for the Nuclear Regulated Asset Base scheme for Q4 2025 IPA

LCCC has made an adjustment to the Nuclear Regulated Asset Base (RAB) scheme’s Interim Levy Rate (ILR) for the Obligation Period commencing on 1 December 2025 and ending on 31 December 2025. This has occurred in part due to a new RABP values being officially given to LCCC by Ofgem in relation to Sizewell C commercial signing.

From 1 December 2025 to the 31 December 2025, the amounts are:

• RAB ILR = £3.494 /MWh

The RAB TRA for this period will remain unchanged at:

• RAB TRA = £8,307,825.45

The payment due date for the TRA is 17 December 2025 in line with the 30-day payment terms.

ILR and TRA for Nuclear Regulated Asset Base scheme for Q1 2026 Determination

LCCC has set a determination to the Nuclear Regulated Asset Base (RAB) scheme’s Interim Levy Rate (ILR) for the Obligation Period commencing on 1 January 2026 and ending on 31 March 2026.

From 1 January 2026 to 31 March 2026, the amounts are:

• RAB ILR = £3.663 /MWh
• RAB TRA = £17,967,925.87

The payment due date for the TRA is 19 January 2026 in line with the 5-day payment terms.

Operational Costs Levy (OCL)

The Operational Costs Levy rate is set, and the amount is:

• RAB OCL = £ 0.0028 /MWh

The RAB OCL will apply to all settlement dates, starting from when LCCC enters into the revenue collection contract with the generator (this occurred on the 4 November 2025). It will be levied based on the Balancing and Settlement Codes’s SF run data, in exactly the same way as the CfD OCL.

Important note

Please note that these values are for the Nuclear RAB scheme. They are calculated under The Nuclear Regulated Asset Base Model (Revenue Collection) Regulations 2023. They must not be confused with the levy parameters for the CfD scheme which are unaltered by this announcement.

EMRS has published a news item to support suppliers with the timing of activities and Credit Cover requirements for Q4 2025.

A similar news item is also available for Q1 2026.

You can visit the Stakeholder Support for Supplier Nuclear RAB page on the EMRS website for step-by-step guidance on the activities you need to complete following this announcement.

The Nuclear RAB dashboard and forecasting information are available on the LCCC Scheme Dashboards.

The ILR and TRA presented in this bulletin refer to the Nuclear Regulated Asset Base. They have no relation to the ILR nor to the TRA of the Contracts for Difference (CfD) Scheme.

We welcome any suggestions or feedback on what else would be useful to cover during the webinar—please email info@lowcarboncontracts.uk.