UK non-commodity charge · Renewables and capacity · Electricity
Nuclear RAB levy (Sizewell C)
Latest published rate, who sets it, and where it is forecast to go.
What Nuclear RAB levy (Sizewell C) is, who sets the rate, what the revenue funds and where it is heading. Rates come from the Purely Energy non-commodity cost data hub; forecasts are our own.
Roughly 0.5 to 1.5% of a typical UK business electricity bill
Nuclear RAB levy (Sizewell C): what it is, who charges it, and what it pays for
What it is
The Nuclear RAB levy (Sizewell C) charge in plain English
New levy funding the construction of Sizewell C nuclear power station in Suffolk. Consumers pay during construction so the project can be financed more cheaply. Started November 2025.
Introduced November 2025 (Nuclear Energy (Financing) Act 2022). First Charging Year allowed revenue: £1.44bn.
Who charges it
The body that sets the rate
LCCC (Low Carbon Contracts Company) sets a quarterly Interim Levy Rate from the allowed revenue approved by Ofgem under the Regulated Asset Base licence
Unit
p/kWh
Applies to
All electricity supplies
What it pays for
Where the revenue ends up
Construction of Sizewell C (3.2 GW nuclear plant), UK energy security and net zero
Share of typical bill
0.5 to 1.5%
DESNZ Nuclear Regulated Asset Base impact assessments put the levy at 0.5 to 1.5% of a non-domestic bill in the early construction years, rising as spend ramps.
Forecast trajectory
Forecasts from our non-commodity cost model. P10, P50 and P90 are the 10th, 50th and 90th percentile outcomes; P50 is the central estimate.
| Year | P10 | P50 | P90 | Confidence | Rationale |
|---|---|---|---|---|---|
| 2026-27 | 0.4000 | 0.4400 | 0.4800 | high | Based on confirmed construction mobilisation costs and regulatory framework |
| 2027-28 | 0.5500 | 0.6100 | 0.6800 | high | Major civil works commencement with established cost profiles |
| 2028-29 | 0.7200 | 0.8100 | 0.9200 | med | Construction acceleration phase with potential for cost variations |
| 2029-30 | 0.8500 | 0.9800 | 1.150 | med | Peak construction period with increasing cost uncertainty |
| 2030-31 | 0.9800 | 1.160 | 1.380 | med | Anticipated peak charge level with construction spend profile uncertainty |
| 2031-32 | 0.9000 | 1.160 | 1.450 | low | Undefined regulatory frameworks and potential construction delays |
| 2032-33 | 0.8500 | 1.140 | 1.500 | low | Project completion uncertainty and regulatory treatment unknown |
| 2033-34 | 0.7000 | 1.020 | 1.400 | low | Transition to operational status with undefined charging methodology |
| 2034-35 | 0.6000 | 0.9000 | 1.250 | low | Operational phase estimates based on historical construction data |
Nuclear RAB levy (Sizewell C) FAQs
What is the Nuclear RAB levy (Sizewell C) charge?
New levy funding the construction of Sizewell C nuclear power station in Suffolk. Consumers pay during construction so the project can be financed more cheaply. Started November 2025.
Who sets the Nuclear RAB levy (Sizewell C) rate?
The Nuclear RAB levy (Sizewell C) rate is set by LCCC (Low Carbon Contracts Company) sets a quarterly Interim Levy Rate from the allowed revenue approved by Ofgem under the Regulated Asset Base licence.
What does Nuclear RAB levy (Sizewell C) pay for?
Nuclear RAB levy (Sizewell C) revenue supports Construction of Sizewell C (3.2 GW nuclear plant), UK energy security and net zero.
What is the Nuclear RAB levy (Sizewell C) forecast?
Our latest forecast for 2026-27 is 0.4400 p/kWh (high confidence). Based on confirmed construction mobilisation costs and regulatory framework
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Rate data from the Purely Energy non-commodity cost data hub (dh.purelyenergy.co.uk). Published rates come from statutory publications by the body listed above; forecasts are modelled from published guidance and market trends, so treat P50 as a central estimate and use P10/P90 for sensitivity. Primary source