US and Japan commit to $80 billion nuclear power fleet as Sizewell C costs draw scrutiny

The United States has unveiled plans for an $80 billion (£66.7 billion) investment in a fleet of nuclear power stations, aiming to deliver electricity at a cost substantially below that of Britain’s Sizewell C project. The move comes as part of a new US-Japan trade agreement, with Japanese investors expected to underwrite the bulk of the gigantic infrastructure initiative.

Central to the strategy is the construction of about eight Westinghouse AP1000 reactors, each providing roughly one gigawatt of clean electricity. This initiative marks a notable collaboration between the US government and the reactor’s owners, Brookfield and Cameco, seeking to accelerate the deployment of next-generation nuclear technology across America. The deal forms a substantial portion of the $550 billion investment pledged by Tokyo, reflecting Japan’s strategic commitment to advanced energy.

Cost analysis reveals that the American projects will come in at around $10 billion (£7.5 billion) per gigawatt of new capacity, making them markedly more economical than Britain’s Sizewell C. The Suffolk site, now given the governmental green light, is projected to generate 3.2 gigawatts for £38 billion—equivalent to about £11.9 billion per gigawatt. This cost disparity highlights growing concerns about Britain’s nuclear procurement and construction, where critics point towards the selection of EDF’s EPR reactors and a complex regulatory environment for escalating expenses.

The situation is compounded by recent developments at Hinkley Point C in Somerset, where costs have ballooned to an estimated £48 billion. The ongoing debate over value for money in new nuclear projects continues, as policymakers and industry leaders seek ways to manage skyrocketing budgets while fulfilling national decarbonisation commitments. American officials have made clear their intention to reinvigorate domestic nuclear capabilities, with President Trump designating atomic energy a central pillar of his energy security and innovation agenda.

Westinghouse’s track record has been mixed, with the high-profile bankruptcy during the construction of twin Vogtle reactors in Georgia leading to a change in ownership. The company’s fortunes appear reviving under Brookfield, who now trumpet their reactor technology’s expanding global presence, with six AP1000 reactors meeting high operational standards and a further nineteen at various stages of deployment or planning worldwide.

British stakeholders maintain that Sizewell C, as a replica of an approved design, will bring costs down in future and contribute significant savings for consumers over its operational lifetime. Government analysis anticipates that, once operational, Sizewell C could reduce the UK’s annual system costs by £2 billion, offering clean electricity to six million homes for decades.

The contrasting approaches on either side of the Atlantic are likely to fuel further debate over the economics of nuclear energy and the most effective models for financing and procurement in the coming years.