European Nuclear Projects Face Major Cost Overruns and Delays

Recent nuclear projects in Europe illustrate the financial and scheduling challenges associated with new reactor designs, particularly the European Pressurised Reactor (EPR), one of the latest iterations of nuclear reactors (Generation III+). As our chart shows, all three flagship projects – Olkiluoto 3 in Finland, Flamanville 3 in France and Hinkley Point C in the United Kingdom – have experienced major cost overruns and delays. Olkiluoto 3, for example, saw costs rise from €3.2 billion to €11 billion and construction time stretch from 4 to 18 years, while Flamanville 3’s estimated cost ballooned from €3.3 billion to €23.7 billion, with the timeline extending from 5 to 17 years. Hinkley Point C, still under construction, is now projected to cost around €55 billion, more than double initial estimates (not adjusted for inflation).

Several factors lie behind these setbacks. First-of-a-kind reactor designs, complex regulatory requirements and evolving safety standards have led to repeated redesigns and construction delays. In addition, supply chain constraints, a loss of industrial know-how in Europe after decades of limited new builds, and stricter post-Fukushima safety requirements have all contributed to rising costs and extended timelines. These challenges have significant implications for profitability, as delays increase financing costs and push back revenue generation, putting pressure on project economics.

However, the picture is not uniform globally. In countries such as China, South Korea and, to some extent, India, nuclear projects have generally been delivered more quickly and at lower cost, benefiting from standardized designs, experienced supply chains and continuous construction programs. Meanwhile, emerging nuclear markets such as Turkey and Egypt are pursuing large-scale projects, often with support from foreign partners like Russia, although these too face long timelines and potential financial risks.