Sizewell C
Sizewell C
Sizewell C nuclear power station will deliver an additional source of reliable, low-carbon electricity for the UK and will be the first nuclear power project globally to be financed under the Regulated Asset Base (RAB) model. Once operational, Sizewell C will provide around 3.2GW of reliable baseload power - enough to supply approximately six million homes, or around 7% of the UK’s forecast electricity demand for decades to come.
Related
Regulated Asset Base Model
Tideway
Cadent
About Sizewell C
Located on the Suffolk coast, next to the existing Sizewell B plant, Sizewell C will consist of two European Pressurised Reactors (EPRs) designed to operate for at least 60 years. The project plays a critical role in meeting the UK Government’s objectives for energy security and Net Zero, providing clean, dependable power to replace and scale the aging nuclear capacity and complement renewable energy sources to reduce reliance on fossil fuels.
The increasing demand for electricity and the push for Net Zero requires energy system transformation. This transformation will yield benefits of clean power, vastly reduce international fossil fuel dependence and affords great opportunities for economic growth. At the same time, it will also in introduce new challenges of energy security, affordability, system stability/reliability and significant use of land. Nuclear power can support with all these challenges as part of a diverse energy mix. The 24GW ‘new nuclear’ pipeline could meet ~25% of electricity demand in 2050 making it the second biggest contributor to the UK 2050 Net Zero economy.
As the second ‘new nuclear’ power project in the UK since the 1990s, Sizewell C is expected to generate 10,000 jobs at peak construction and 1,500 skilled apprenticeships, support thousands more across the UK supply chain, and create 1,000 permanent skilled roles once operational. Approximately 70% of the construction spend is based in the UK supporting local economies and communities. The project will also deliver a 19% net biodiversity gain, creating hundreds of acres of new habitats around the site.
Construction will take place over approximately a decade, with the twin reactors scheduled to begin full operations in the late 2030s.
Key impacts and benefits
3.2 GW
60 years
c. 6 m
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9 tCO2e
+ 19 %
c. 10,000
Why we invested
INPP’s investment in Sizewell C is a landmark transaction playing a significant role in the UK’s transition to Net Zero, tackling the threat of climate change whilst generating long-term, regulated and inflation-linked returns for our investors within a robust policy and contractual framework designed to balance value for money for consumers with attractive, risk-adjusted returns for investors.
- Stable, inflation-linked revenues: INPP will receive attractive regulated returns from financial close onwards, a rare feature in large construction projects.
- Robust protections: The Government Support Package provides strong downside protection for investors, with safeguards against construction cost overruns and ring-fenced nuclear liabilities.
- Proven delivery model: The RAB framework, successfully used for other regulated utilities such as Tideway, provides transparent risk sharing between Government, investors, and consumers.
- Strategic diversification: Enhances INPP’s portfolio alongside other regulated assets such as Tideway and Cadent.
- Positive social and environmental outcomes: Delivers clean, secure energy, high-quality employment, and measurable biodiversity improvements.
SDGs supported

The Regulated Asset Base (RAB) model
The RAB model is a government-regulated financing framework designed to attract private capital into essential infrastructure while protecting consumers.
Despite long construction lead times, investors receive a regulated, inflation-linked return from day one throughout construction.
Ofgem oversees the framework to ensure transparency, efficiency, and value for money.
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2019
Amber response to nuclear RAB consultation
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2022
Nuclear Financing Act
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2023
Start of equity raise pre-qualification process
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April 2024
Start of Sizewell C construction
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November 2025
INPP reaches Financial Close on Sizewell CFinancial close marking revenue commencement
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Late 2030s
Expected construction completion
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2099
Operations end after ~60 years
Outcomes
Sizewell C will provide clean, reliable electricity for generations, complementing intermittent renewables and contributing to the UK’s net zero targets.
The project will:
- Enhance UK energy security by reducing dependence on imported fossil fuels.
- Support the national economy through thousands of skilled jobs and regional supply chain investment.
- Deliver long-term, inflation-linked revenues that strengthen INPP’s ability to maintain a progressive dividend policy.
- Advance sustainable finance by proving the RAB model’s ability to deliver large-scale, low-carbon infrastructure at a lower cost to consumers.
