Powering The Future: The UK's Nuclear Revolution

Introduction

Nuclear power has long been one of the cornerstones of the UK's energy mix, providing a reliable source of low-carbon electricity. As the UK embarks on its Clean Energy Superpower mission, aiming for a clean electricity system by 2030 under the Clean Power 2030 Action Plan (CPAP) and achieving Net Zero by 2050, nuclear power, alongside renewable sources, will spearhead the transition to a sustainable energy future. Recent policy changes, regulatory adjustments, and legislative initiatives have fostered a favourable environment for both traditional and advanced nuclear technologies as the UK pursues decarbonisation. This article will explore these developments, beginning with the UK's ambition and vision, and examining governmental support for nuclear projects. Additionally, we will offer insights into fusion and other innovative technologies, illustrating how the UK’s energy landscape is prepared to embrace the nuclear revolution.

What is the UK's ambition and vision for nuclear?

Currently, the UK has 5.9 GW of nuclear installed capacity; however, 4.7 GW are expected to come offline by 2030. In both the British Energy Security Strategy (2022) and the Powering Up Britain strategy (2023), the UK government committed to delivering up to 24 GW of nuclear by 2050 to cover a quarter of the country's projected demand, placing the technology on equal footing with renewable energy sources. This long-term target was reconfirmed in the Civil Nuclear Roadmap to 2050 ('Roadmap') published in 2024, which elucidates the pathway to delivering a mix of large-scale nuclear power plants, innovative technologies such as small modular reactors (SMRs) and advanced modular reactors (ADRs), and fusion. The Roadmap details plans for the biggest expansion of nuclear energy in 70 years, including the construction of a major new nuclear power plant. This evolution reflects the government's commitment to sustaining a diverse, home-grown, and resilient energy portfolio, capable of withstanding geopolitical shocks while fostering technological innovation and economic growth. The Roadmap's ambition is reiterated in the latest report on the pathways to achieve Net Zero by 2050, the Future Energy Scenarios ('FES') 2024 produced by the new independent energy system operator and planner, the National Energy System Operator (NESO). Finally, CPAP, which is based on FES, concludes that in a renewables-based system, nuclear is essential to deliver a 'backbone' of vital firm low-carbon power.

How does the UK support nuclear technologies?

From traditional large-scale nuclear power plants to ground-breaking technologies, the UK has taken important policy, regulatory, financial, and legislative measures to support nuclear. These include a strategic approach to designing the energy system, improved permitting procedures, and funding mechanisms.

Strategic planning

The UK has adopted an integrated and whole-system approach in planning, managing, and operating the energy system, led by NESO. In a geographically constrained area with competing interests such as farming, biodiversity, and aerospace, project developers require more certainty regarding the optimal locations, quantities, and types of energy projects needed to achieve Net Zero. This information will be provided by the Strategic Spatial Energy Plan (SSEP), expected in 2026. The SSEP aims to accelerate and optimise Great Britain's energy transition, outlining a pathway from 2030 to 2050. The first SSEP focuses on electricity generation and storage, including technologies like large-scale nuclear and SMRs, but excluding ADRs. These will be considered in future iterations of the SSEP.
 

Faster, streamlined, effective, and cost-efficient permitting

The UK government has recently announced important changes in consenting nuclear technologies, easing the permitting procedure. First, they plan to replace the National Policy Statement (NPS) for Nuclear Energy Generation (EN-6), the statutory document that sets out the government's policy to permit applications for nuclear nationally significant infrastructure projects (NSIPs – projects that exceed a specific power capacity threshold), with a new NPS called EN-7. The new regime will apply to all nuclear – heat and electricity – developments that exceed 50 MW. The NPS removes two restrictions:

• A geographical restriction of building nuclear plants in a set list of eight sites. Nuclear sites will be built anywhere in England and Wales on a criteria-based approach, including high standards of safety, security, and environmental protection.
• A time-limit restriction to deploy new projects in the eight sites by 2025, providing developers with more certainty and flexibility to build new plants. 

EN-7 also extends the scope of technologies covered and supports cutting-edge technologies, such as SMRs and AMRs, alongside gigawatt-scale plants. Additionally, a Nuclear Regulatory Taskforce will accelerate regulatory reforms and project delivery, including investment incentives. The consultation on EN-7 proposals has recently concluded, with the final version expected to be laid before Parliament in autumn 2025.

Along with the nuclear-specific NPS, the infrastructure permitting system in the UK is undergoing a major reform through the Planning and Infrastructure Bill 2025. The purpose of the Bill is to accelerate consenting for NSIPs, including through alternative routes of permitting on a case-by-case basis, streamlined and shorter consultation requirements, and a stricter judicial review system to limit meritless challenges against decisions that approve major infrastructure. These changes, when finalised, possibly in late 2025, are expected to apply to nuclear projects.

Furthermore, in March 2024, the Office for Nuclear Regulation (ONR), the Environment Agency (EA), and Natural Resources Wales (NRW) developed voluntary guidance for early regulatory engagement for those deploying nuclear projects in Great Britain. This guidance is intended for project developers, technology vendors, and permit holders.

Funding and derisking investment in nuclear

Nuclear projects are expensive to build. The recent examples of billions of budget overruns for the two new large-scale power plants, Sizewell C and Hinkley Point C (each having a capacity of approximately 3.2 GW), underscore the critical need for diverse and robust funding options to ensure the viability of these projects. We examine below some of the options including a new finance model and support from public bodies.
 

1. A new finance model: the Nuclear Energy (Financing) Act 2022 (NEFA 2022)
   NEFA 2022 introduces the use of the regulated asset base (RAB) model to finance new nuclear projects. This model is commonly used for major infrastructure projects such as airports, water, and energy networks because it helps to de-risk private investment. Under the nuclear RAB model, an eligible nuclear company will receive a guaranteed return on investment throughout the lifetime of the nuclear asset, which is reflected in the licence conditions. The RAB model is now preferred for large scale projects and possibly for SMRs, over other financing options, such as the bespoke Contract for Difference (CfD) deal used for financing Hinkley Point C in 2016. The CfD is a subsidy scheme that covers the entire construction costs of the project through a fixed price for electricity output once the plant becomes operational. However, the main issue with CfD is that project developers bear the entire construction risk, whereas under the RAB model, this risk is shared with consumers. Sizewell C has sought support through the RAB model, with the final version of the RAB licence conditions expected to be issued by Ofgem soon.

2. The role of Great British Nuclear, Great British Energy, and National Wealth Fund
   With the Energy Act 2023, the UK government has established a new publicly owned company, Great British Nuclear (GBN). GBN is the expert vehicle responsible for driving the delivery of new nuclear projects through each stage of project development, co-funding selected technologies, and ensuring the right financing and site arrangements to meet the 24 GW nuclear target by 2050. GBN's first priority is to run a competitive process to select the best SMR technologies. This selection process has reached its final stage, with the decision expected this Spring.

   The new UK government has created two more new bodies to support investment and provide funding for clean energy projects: Great British Energy (GBE) and National Wealth Fund (NWF). With a capital of £7.3 billion, GBE's purpose is to develop, invest in, build, and operate clean, home-grown energy projects. GBE aims to accelerate Great Britain's pathway to energy independence and security by working closely with industry, local authorities, communities, and other public sector organisations. According to GBE's founding statement, the UK government will explore how GBE and GBN can best work together on delivering the nuclear programme. GBE will be officially established once the Great British Energy Bill becomes an Act.

   The National Wealth Fund (NWF), previously known as the UK Infrastructure Bank, has been allocated £27.8 billion to stimulate investment in clean energy projects, including nuclear, and to support the implementation of the new industrial strategy. GBN, GBE, and NWF play crucial roles in nuclear investment, financing, and de-risking. However, the future of nuclear development will also be influenced by the upcoming Industrial Strategy and the Spending Review.

3. Invest in 2025 and Spending Review
   In October, the UK government launched a consultation on the green paper 'Invest 2035: the UK's modern industrial strategy'. This strategy aims to remove barriers to growth and foster a pro-business environment in eight key sectors, including clean energy industries. Although nuclear projects are typically included under the 'clean energy' category, some stakeholders have requested through their responses a specific mention of nuclear technology to avoid any ambiguity. The final industrial strategy will be announced in June, alongside the second phase of the Spending Review.
   The Spending Review is the government's process for setting departmental budgets for future years. The first phase of the review, announced in the Autumn Budget 2024, confirmed departmental budgets for 2024-25 and set budgets for 2025-26. The crucial second phase, also known as 'the envelope,' will establish spending plans for the next three years over a five-year period to achieve the government's objectives, including the growth and Clean Energy Superpower missions. As emphasised by various stakeholders, the Spending Review will play a pivotal role in supporting nuclear projects.
    

Fusion, the 'holy grail' of nuclear

The UK is leading the way in fusion energy development and innovation. Starting with the UK's fusion strategy in 2021, updated in 2023, the UK became one of the first countries to enact specific fusion legislation through the Energy Act 2023. This new legislation separates the regulations governing fusion energy from those that apply to traditional nuclear technologies by amending the Nuclear Installations Act 1965 to exclude fusion energy projects. As a result, fusion projects will not require licences from or be regulated by ONR, streamlining the path to commercial fusion energy deployment.

In May 2024, the UK government published a proposal for a new fusion-specific National Policy Statement (NPS), EN-8, to support an open-sited and technology-inclusive approach to siting new fusion energy facilities. Similar to EN-7, the fusion-specific NPS will use strategic criteria when identifying and assessing new sites for fusion facilities. The proposal also recommends designating all fusion plants as Nationally Significant Infrastructure Projects (NSIPs). The government has not yet published its final decision on EN-8.

In parallel, the UK government continues to advance fusion-specific projects and funding arrangements. Some of these initiatives include:

• The pioneering Spherical Tokamak for Energy Production (STEP) programme, supported by £410 million funding from the UK government, aims to commercialise the technology and develop the first viable fusion power plant by 2040.
• The landmark UK and US joint project, LEAPS, in partnership with Tokamak Energy.
• A new joint private and UK government fusion investment fund, 'Starmaker One,' to assist fusion businesses and start-ups in commercialising the technology. The government has invested £20 million in the fund, which has the potential to raise between £100 million and £150 million overall investment.
   

AMRs, SMRs and the AI twist

AMRs, also known as Generation IV reactors, have the potential to support a variety of applications beyond electricity generation. These include hydrogen production, industrial and domestic heating, and nuclear waste management solutions. To support these technologies, the UK government awarded £196 million last year to build a commercial facility for the production of high-assay low enriched uranium (HALEU), a fuel necessary for powering AMRs.

SMRs also show promising applications. The technology is expected to contribute significantly to the UK's ambition to become a global leader in the Artificial Intelligence (AI) sector. The AI Opportunities Action Plan ('AI Plan') aims to establish 'AI Growth Zones' (AIGZs) to facilitate and expedite the deployment of advanced AI data centres. The first AIGZ could be located in Culham, adjacent to the UK Atomic Energy Authority. An AI Energy Council has been launched to identify clean and sustainable energy solutions to meet the considerable power requirements of these AI data centres. SMRs are among the technologies anticipated to fulfil the energy needs of these centres.

Similar to fusion, the UK wants to lead innovation and commercialise the use of alternative nuclear technologies, particularly as these technologies can be cheaper than traditional nuclear due to their size, modularity, and replicability. In a consultation launched in 2024, the UK government explores alternative routes to market for these technologies beyond GBN, HALEU, and the Advanced Nuclear Fund (ANF) that offer support to both SMRs and AMRs. For example, the RAB model might be more suitable for financing cutting-edge nuclear technologies than CfDs. The alternative routes to market proposals, when finalized and taken forward, will be a game changer for the deployment of SMRs and AMRs.

Conclusion

The UK's nuclear policy is a dynamic and evolving framework that continuously reflects its commitment to a secure, low-carbon, and innovative energy future. This policy also leverages nuclear technology to support other critical sectors such as AI. By promoting a diverse range of nuclear technologies—from large-scale power plants to cutting-edge fusion research—the UK aims to meet its ambitious climate goals, drive innovation, and stimulate substantial economic growth. The opportunities presented by the UK's nuclear revolution are vast, with new supportive planning frameworks making it easier to capitalise on them.