In a landmark moment for the UK’s energy future, Sizewell C has achieved financial close using an innovative private investment model. Located on the Suffolk coast, this massive nuclear power station is now fully funded and ready to enter full-scale construction. It marks the first time a nuclear project anywhere in the world has been financed through the UK’s Regulated Asset Base (RAB) system with significant private capital. Once complete, Sizewell C will generate enough clean, reliable electricity to power six million homes for at least 60 years—delivering a huge boost to energy security, jobs, and the economy.This isn’t just another power plant. Sizewell C represents a turning point in how Britain builds large-scale energy infrastructure. By blending government support with private investment, the project has unlocked billions in funding while keeping costs under control for consumers. It’s a model that other countries are already watching closely. Let’s break down what this means, why it matters, and how nuclear power fits into the broader push for renewable energy and a low-carbon future.
A New Way to Fund Nuclear PowerTraditionally
Building a nuclear power station has been a government-led affair. Massive upfront costs, long construction timelines, and complex regulations meant only state-backed projects could move forward. But Sizewell C has changed the game.In July 2025, the project reached its Final Investment Decision (FID) and successfully raised equity from private investors. This was followed by securing £5 billion in debt through the Bpifrance Assurance Export (BpifranceAE) export credit facility—a green loan aligned with Sizewell C’s sustainable financing framework. Major banks like HSBC and Santander provided crucial backing, while a £500 million working capital facility was added alongside a term loan from the UK’s National Wealth Fund.The real innovation? The Regulated Asset Base (RAB) model. Under RAB, investors are paid a steady return during construction, funded through a small charge on consumer electricity bills. This reduces risk for private capital, spreads costs over decades, and keeps borrowing rates low. It’s like paying for a mortgage on a house while it’s being built—except the “house” is a nuclear reactor that will deliver clean electricity for generations.Sizewell C’s joint-managing directors, Julia Pyke and Nigel Cann, called it “a transformative project for Britain’s energy future.” They’re not wrong. The RAB approach has attracted interest from nations planning their own nuclear programs, proving that large infrastructure can be funded without putting everything on the taxpayer.
From Paper to Power: Construction Now Underway
With financial close secured, money is flowing, and construction crews are scaling up. The Suffolk site is buzzing with activity as the first major concrete pours begin. Sizewell C will be built next to the existing Sizewell B station, taking advantage of shared infrastructure and decades of operational experience.The plant will consist of two EPR (European Pressurised Reactor) units—advanced designs already in use in France, Finland, and China. Each reactor will produce 1.6 gigawatts of electricity, enough to run a city the size of Manchester around the clock. Together, they’ll supply 7% of the UK’s total electricity demand with zero carbon emissions during operation.Unlike solar panels or wind turbines, nuclear power doesn’t depend on the weather. It provides baseload electricity—steady, predictable power that keeps the national grid stable even during dark, windless winters. This reliability is priceless as Britain transitions away from coal and gas.
Powering Six Million Homes—and Creating Thousands of Jobs
When Sizewell C comes online in the early 2030s, it will deliver enough electricity to power six million British homes. That’s roughly one in four households across the country running on clean, home-grown energy. Over its 60-year lifespan, the plant will prevent tens of millions of tonnes of CO2 from entering the atmosphere—equivalent to taking millions of cars off the road.But the benefits go far beyond electricity. The project is a jobs machine. At peak construction, over 10,000 workers will be on site. Thousands more will be employed in supply chains across the UK—from steel fabrication in the North East to engineering in the Midlands. Sizewell C has committed to creating 1,500 apprenticeships, training the next generation of nuclear engineers, electricians, and project managers.Energy Secretary Ed Miliband called the financial close a “major milestone.” During a visit to a renewable energy innovation centre in Aberdeen, he said: “By backing nuclear, we are creating thousands of high-quality jobs across the country, supporting British supply chains, and keeping the lights on with homegrown energy for generations to come.”
A British-Majority Nuclear Power Station
For the first time in decades, Britain will own the majority of a new nuclear power station. The UK government holds a significant stake, alongside private investors like La Caisse, Centrica, EDF, and funds managed by Amber Infrastructure Group. This structure ensures national control over critical energy infrastructure while leveraging global expertise.EDF, the French energy giant with decades of nuclear experience, remains a key partner. But the balance has shifted: British institutions now lead the way. This matters for energy security. Relying less on imported gas—especially after the Ukraine crisis exposed Europe’s vulnerabilities—means greater independence and lower exposure to volatile global markets.
The Economics: Big Upfront, Bigger Long-Term Savings
Yes, nuclear power stations are expensive to build. The total cost for Sizewell C is capped at £47.7 billion in the worst-case scenario, with the National Wealth Fund providing a £36.6 billion loan facility as a buffer. But context is everything.Once operational, nuclear plants are incredibly cheap to run. Fuel costs are low, and a single reactor operates for 18 months between refuelling. Compare that to gas plants, where fuel prices swing wildly with global events. The government estimates Sizewell C will save £2 billion per year across the low-carbon electricity system by displacing dirtier, more expensive generation.The RAB model keeps consumer bills in check. The charge added during construction is small—estimated at less than £1 per month on the average household bill. In return, Britain gets decades of stable, low-cost electricity. It’s a long-term investment that pays off when you factor in climate goals and energy security.
Nuclear and Renewables: Partners, Not Rivals
Nuclear power isn’t here to replace renewable energy—it’s here to complement it. Wind and solar are booming across the UK. Offshore wind farms in the North Sea now generate enough electricity to power millions of homes. Solar panels cover rooftops and fields from Cornwall to Scotland. But both are intermittent. When the wind drops or the sun sets, something else must fill the gap.That’s where nuclear shines. Sizewell C will provide constant baseload power, allowing the grid to absorb more wind and solar without risking blackouts. It’s a perfect partnership: renewables supply clean energy when nature cooperates, and nuclear steps in when it doesn’t.This balanced approach is already working elsewhere. France generates over 70% of its electricity from nuclear, with the rest from renewables. Ontario in Canada combines nuclear, hydro, and wind for one of the cleanest grids in the world. Britain is now following suit—Sizewell C will join Hinkley Point C as twin pillars of low-carbon reliability.
Safety, Waste, and Public Trust
Nuclear power has come a long way since the 1970s. Modern reactors like the EPR include multiple safety systems. If anything goes wrong, the reactor shuts down automatically. Thick concrete containment domes can withstand aircraft impacts. Cooling systems work even without electricity, using gravity and natural circulation.Radioactive waste is a valid concern—but it’s manageable. The volume is tiny compared to coal ash or gas plant emissions. High-level waste from Sizewell C will be stored securely on site in dry casks, then moved to a future geological disposal facility deep underground. Finland is already building the world’s first permanent repository; the UK is planning its own.Public trust is improving. Polls show growing support for nuclear as people learn the facts. It’s safer than coal, oil, or even rooftop solar installation (which causes more deaths per unit of electricity generated). Sizewell C will operate under strict oversight from the Office for Nuclear Regulation, with transparency at every step.
The Bigger Picture: Energy Security and Net Zero
Britain has legally binding targets to reach net zero carbon emissions by 2050. That means decarbonising electricity, transport, heating, and industry. Electricity demand is set to double as we switch to electric cars, heat pumps, and hydrogen production.Renewables will do the heavy lifting—but they can’t do it alone. The National Grid ESO says we need firm, dispatch able power to balance the system. Nuclear is the only low-carbon technology that can deliver gigawatts of electricity on demand, 24/7, for decades.Sizewell C is a cornerstone of that strategy. It will:
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Cut CO2 emissions by millions of tonnes annually
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Reduce reliance on imported gas
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Stabilise energy prices over the long term
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Support the growth of renewable energy by providing backup
Supply Chains and Regional Growth
The project isn’t just about Suffolk. Steel from Sheffield, turbines from the Midlands, and cables from Wales will all feed into construction. Over 70% of the spend will stay in the UK, boosting manufacturing and skills.Local colleges are already training apprentices in welding, electrical engineering, and project management. East Anglia will see new housing, schools, and transport links to support the workforce. It’s regeneration on a grand scale.
What’s Next for Sizewell C?
With financial close achieved, the focus shifts to delivery. Key milestones include:
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2026: Major civil engineering complete
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2028: Reactor buildings taking shape
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2030–2031: First reactor operational
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2033: Second reactor online
The project team is laser-focused on schedule and budget. Lessons from Hinkley Point C—where costs rose due to first-of-a-kind challenges—are being applied. Sizewell C benefits from a replicated design, experienced contractors, and a streamlined supply chain.
A Model for the World
Other countries are taking note. Japan, Poland, and the Czech Republic have all expressed interest in the RAB model. For nations without vast public budgets, it offers a way to build nuclear power with private capital while protecting consumers.The UK is now a global leader in nuclear financing innovation. That’s something to be proud of.
Conclusion: A Brighter, Cleaner Energy Future
Sizewell C is more than a power station—it’s a statement of intent. Britain is serious about clean, reliable electricity. By combining nuclear and renewable energy, we’re building a system that’s sustainable, secure, and affordable.When the reactors light up in the 2030s, six million homes will run on power generated just a few miles from the North Sea. Thousands of workers will have lifelong careers. Billions will be saved on energy imports and carbon taxes. And the UK will take a giant step toward net zero.Nuclear power is back—and with private investment, smart regulation, and public support, it’s here to stay. Sizewell C isn’t just building reactors. It’s building Britain’s energy future.