RAB Levy 2025: What It Means for UK Business Energy Costs

Quick answer: The RAB levy is a new government charge added to UK electricity bills from 2025. It will help fund the construction of nuclear projects, including Sizewell C, by spreading costs across households and businesses. The levy is applied per megawatt-hour (MWh) of electricity supplied, with costs passed on through energy suppliers to end-users.

What is the RAB Levy?

The RAB levy (Regulated Asset Base levy) is a funding mechanism introduced by the UK government to finance new nuclear power stations. Rather than private investors shouldering all the upfront costs, the model spreads costs across electricity users through a small charge added to bills.

The levy is applied to suppliers per unit of electricity (per MWh), who then pass this cost on to consumers and businesses through bills. This ensures steady funding for the project during its construction phase and beyond.

For more detail, see the government’s official information on the Sizewell C project.

Why Has It Been Introduced?

The UK is legally committed to achieving net zero by 2050. Nuclear power is central to this target because it provides low-carbon, reliable energy to support the wider shift away from fossil fuels.

Nuclear projects, however, are expensive and take years to deliver. By introducing the RAB levy, the government aims to:

• Reduce borrowing costs for developers
• Share risk between investors and bill payers
• Secure long-term investment in clean, stable electricity generation

How Much Will the RAB Levy Cost UK Businesses?

The levy’s cost depends directly on electricity usage.

• SMEs with modest demand are likely to see only a minor increase in bills.
• Energy-intensive sectors such as manufacturing, cold storage, hospitality, and education will feel more of an impact, as the levy is calculated per MWh consumed.

While early estimates suggest the impact will be small initially, the levy is expected to remain in place for the lifetime of the nuclear projects it supports. Businesses should plan for it as a permanent feature of their bills.

What Can Businesses Do?

The levy itself cannot be avoided, but businesses can take steps to manage its overall impact:

• Review your contract to avoid costly out-of-contract or deemed rates
• Monitor consumption with tools such as Energy Metrics, helping to identify wasted or out-of-hours usage
• Build policy-driven levies into your long-term financial planning
• Seek expert support to find savings elsewhere in your energy spend

Looking Ahead

The RAB levy is another example of how government policy shapes business energy costs. While it represents an additional charge today, its purpose is to support a more secure and sustainable energy system for the future.

At Tritility, we make business energy simple. Whether it’s understanding new levies, finding the right contract, or identifying ways to cut waste, our friendly team are here to help.

Want clarity on your next energy bill? Book a free consultation with Tritility today.

See how Energy Metrics can help offset costs from the RAB levy by tracking and reducing wasted energy.

RAB Levy FAQs

What is the RAB levy?

It’s a government charge introduced in 2025 to fund nuclear power stations, starting with Sizewell C.

How is the RAB levy calculated?

The levy is applied per megawatt-hour (MWh) of electricity supplied. Energy suppliers pass this cost through to businesses and households via bills.

Why has it been introduced?

The RAB model lowers financing costs for nuclear projects and helps ensure stable, low-carbon electricity supply in the UK.

How much will it cost my business?

The cost depends on your usage. Smaller businesses will see modest increases, while high-consumption sectors will pay more.

Can I avoid paying the levy?

No, it’s mandatory. But businesses can reduce overall bills by negotiating better contracts and improving efficiency.