The Hinkley Point C cost estimate has risen to £35 billion as Électricité de France (EDF) revised the budget for the United Kingdom’s largest new nuclear power project, pushing back the delivery of 3.2 gigawatts of firm, low-carbon electricity that UK energy planners have earmarked for long-term security of supply.
EDF said the first reactor at Hinkley Point C in Somerset, southwest England, is now expected to come online in 2030, continuing a schedule slippage that has kept the project off the system during a period of tightening capacity margins and rising electrification demand from transport and heating.
The revised £35 billion figure, stated in 2015 price values in EDF’s project updates reported by industry and financial media, exceeds the £31–£34 billion range previously communicated in 2024 and sits far above the roughly £18 billion level referenced when the project was launched.
From an energy-and-power perspective, the delay matters because Hinkley Point C is designed as a high-load-factor baseload plant that can supply around 7% of Great Britain’s electricity once both units are operating, supporting grid stability as coal exits the system and as variable renewables expand.
The project’s financing structure also keeps it firmly in the UK’s power-policy debate. Under the government-backed Contract for Difference framework, the operator receives a guaranteed strike price of £92.50 per MWh in 2012 prices, indexed to inflation, for 35 years, with top-up payments flowing from consumer bills when wholesale power prices are below the strike price.
EDF’s latest cost escalation reinforces a wider European pattern for the European Pressurised Reactor (EPR) design, where build complexity has been associated with overruns and elongated commissioning timelines. The UK project’s experience is closely watched because it influences confidence in the country’s wider nuclear build-out, including proposed replication builds using similar technology.
For the UK electricity system, later delivery of 3.2 GW of steady output increases the importance of other “firm power” options—such as flexible gas generation, storage, interconnection, demand-side response and emerging small modular reactor plans—to manage peak demand, low-wind periods and system inertia requirements while maintaining decarbonisation momentum.
The UK government has framed nuclear as a strategic energy-security asset and set an ambition to reach 24 GW of nuclear capacity by 2050, positioning large plants and advanced nuclear options as complements to renewables for a more resilient, lower-carbon power mix.
With the Hinkley Point C budget now lifted again and the first unit scheduled for 2030, the project remains a defining test for whether Europe can deliver large-scale nuclear at a cost and cadence that supports energy affordability, decarbonisation and system reliability at the same time.
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