The UK is embarking on a new wave of nuclear power growth, beginning with construction at the Sizewell C plant in Suffolk. Despite broad political support for nuclear energy as a key component of the nation’s energy security, the ambitious project-intended to power six million homes-faces familiar challenges of cost overruns and delays, echoing issues experienced with the Hinkley Point C facility. This report examines the current state of the Sizewell C project, the UK’s wider nuclear ambitions, and a potential shift towards smaller, more modular reactor designs as the country seeks to navigate complex regulatory hurdles and escalating construction costs.
Heavy trucks are steadily making their way to the coastal town of Sizewell in Suffolk, eastern England, signaling the start of major construction on the UK’s newest nuclear power plant, Sizewell C. The increased traffic began this summer and marks a significant shift for the typically quiet North Sea coastline. The project, centered around a complex secured by barbed wire and featuring a large blue-gray building and a massive white dome, aims to help “liberate Britain from the rollercoaster of fossil fuels,” according to Energy Minister Ed Miliband, who spoke at the project’s launch.
Nuclear energy enjoys broad, cross-party support in the UK, viewed as a safe, clean, and reliable energy source. Former Conservative Prime Minister Boris Johnson had previously expressed a desire to increase the proportion of electricity generated from nuclear power to 25%. Now, the Labour government led by Keir Starmer is actively pushing forward with the construction of new nuclear facilities. Even the Reform Party, currently leading in polls, supports nuclear power, with the Green Party being the primary exception advocating for a long-term phase-out. Public opinion largely favors nuclear power, with only a small local group, “Stop Sizewell C,” having unsuccessfully opposed the new build in Suffolk.
Construction Costs Exceed Initial Estimates
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Energy Minister Miliband intends to bolster the UK’s energy supply, mitigating the volatility associated with wind and solar power, through the development of new nuclear plants. He described the initiative as ushering in a “new golden age for nuclear energy.” However, the UK’s experience with recent nuclear construction projects has been challenging. Hinkley Point C, the first new nuclear power plant to be built in the UK in over two decades, located on the coast of Somerset, has faced significant cost overruns and delays. The 3.2-gigawatt facility, intended to power six million homes, utilizes the same Generation III pressurized water reactor technology as the plant in Flamanville, France, and has proven to be a complex and expensive undertaking.
The Flamanville plant, built by French state-owned utility EDF, was completed twelve years behind schedule and experienced substantial cost increases, leading the press to dub it the “Flamanville nightmare.” The challenges faced at Flamanville are raising concerns about the feasibility of large-scale nuclear projects.
Regulatory Hurdles and Costly Environmental Measures
Hinkley Point C is also significantly exceeding its initial budget and timeline. Originally projected to cost £18 billion (in 2015 prices), the project’s expenses are now estimated to range from £31 billion to £35 billion. Factoring in recent inflation, the final cost could reach £42 billion to £48 billion. EDF has also repeatedly revised the completion date. The delays and cost increases at Hinkley Point C are impacting investor confidence in large infrastructure projects.
A government-commissioned report also highlighted the high cost of building regulations and environmental requirements. For example, Hinkley Point C requires the construction of an acoustic fish protection system in the sea – dubbed the “fish disco” by the press – which, along with other stipulations, has cost around £700 million. Hundreds of such requirements and a significant amount of bureaucracy are contributing to the high costs. The report stated that the UK is “the most expensive location in the world” for building nuclear power plants. Some observers question whether there is a fundamental issue with the scale of nuclear projects.
Despite these challenges, the London government has given final approval for Sizewell C, with construction costs estimated at £38 billion. The plant is expected to be completed in the late 2030s and generate electricity for six million homes. Like Hinkley Point C, Sizewell C will utilize a pressurized water reactor – a technology currently operational in only a handful of plants worldwide, including two in China, one in Finland (Olkiluoto 3), and Flamanville. Proponents emphasize the high safety and efficiency of this reactor type, while critics question its cost-effectiveness.
Small Modular Reactors as a Faster, Cheaper Alternative
London is also actively promoting the development of Small Modular Reactors (SMRs), which are built in modular form, meaning most components can be manufactured in a factory setting. This approach is intended to make SMRs cheaper and faster to build. Dozens of companies worldwide are working on SMR development, including established nuclear firms like Westinghouse and GE Hitachi Nuclear Energy, as well as newer US companies like X-energy and Nuscale Power, and the British industrial conglomerate Rolls-Royce.
The UK government has allocated £2.5 billion in funding to support the development of this technology and selected the Rolls-Royce model as the best option in a competition. The move signals a commitment to innovation in the nuclear sector.
SMRs Could Power Up to One Million Homes
The UK aims to be a pioneer in the construction of SMRs, and the site of Wylfa on the island off the coast of North Wales has been chosen for the first project. The location previously hosted a nuclear power plant that was decommissioned a decade ago. Rolls-Royce plans to build three SMRs initially, with the potential for up to eight. These mini-power plants are expected to be operational by the mid-2030s, each capable of powering up to one million households.
The government has not yet disclosed the total cost. Rolls-Royce initially estimated the cost of each 480-megawatt SMR at around £2 billion. More recent estimates suggest a cost of £2 billion to £3 billion per unit. Compared to the £3.2-gigawatt Hinkley Point C or Sizewell C, seven SMRs would likely be significantly cheaper. A private consortium of Centrica and X-energy has also announced plans to build up to twelve modular reactors in Hartlepool, intended to power data centers.
The British government believes SMRs could become a significant export product. Early indications support this view, with the Czech Republic forming a partnership with Rolls-Royce to build up to six SMRs. Both Czech Prime Minister Petr Fiala and UK Prime Minister Keir Starmer highlighted the future potential of this technology. Sweden is also planning to build SMRs, with Vattenfall selecting models from Rolls-Royce and GE-Hitachi in a recent tender.
The International Energy Agency (IEA) estimates that the SMR market will grow substantially, projecting up to 80 gigawatts of SMR capacity installed by 2040, representing one-tenth of the global nuclear power base.
