Re-Evaluating Europe’s Nuclear Future

By Massimiliano Cintura

July 30, 2026

The European Union’s trajectory toward carbon neutrality by 2050 has confronted continental institutions with a complex energy and economics dilemma: reconciling the goal of drastic greenhouse gas emissions reductions with security of supply and cost containment for European households and industries. In recent years, the push toward electrification centered on the integration of non-programmable renewable energy sources (such as solar and wind) into national grids highlighted critical issues related to intermittency and the necessity of securing a reliable baseload power capacity. While the deployment of clean energy proceeds at a steady pace, grid infrastructure restructuring, energy storage systems, and wholesale price volatility have demonstrated that the transition to green energy entails unprecedented and unanticipated financial commitments. In this landscape of profound geopolitical turmoil and its impact on energy security, the debate surrounding the role that nuclear energy could or should have has re-emerged, and it is now at the forefront of the European political agenda. The proponents stress the need to gain energy security. The detractors point out the massive cost of a major push to build nuclear reactors.

The escalation of political and financial costs in large reactors

Historically, the European nuclear industry has relied on the high-capacity structures, typically light-water reactors exceeding 1,000 megawatts electrical (MWe). However, 21st-century construction experiences in Western Europe have exposed a profound structural vulnerability known as the “curse of capital expenditure” (Capex). Traditional large-scale nuclear projects entail engineering complexity resulting in cost overruns, supply chain bottlenecks, construction delays, and stricter regulatory adjustments introduced mid-project. Since the financial cost of a nuclear power plant is concentrated in the building phase—while operational costs at full capacity remain relatively low and stable—every year of construction delay exponentially inflates financing costs and interest expenses. This economic feature –huge upfront costs, and years to complete a project– has rendered traditional giga-reactors extremely unattractive to private financial markets, forcing states to step in with complex public guarantees mechanisms to prevent project failures.

The promise of SMRs: construction philosophy and industrial standardization

In response to the critical challenges of megaprojects, the new frontier of nuclear technology is represented by Small Modular Reactors (SMRs). Conventionally defined as reactors with an individual output of less than 300 MWe per module, SMRs promise to disrupt the industry’s manufacturing paradigm. Unlike traditional plants built entirely on-site as unique civil works (First-Of-A-Kind), SMRs are designed to be mass-manufactured within industrial facilities and subsequently transported and assembled at the final site.

This modularity theoretically reduces construction schedules, lowers initial financial uncertainty, and allows for a phased expansion of generating capacity through the incremental addition of new modules. Furthermore, from a physical safety perspective, most SMR designs incorporate passive safety systems that leverage natural physical phenomena—such as natural circulation, gravity, and thermal conduction—to cool the reactor core even during a total loss of external power or human intervention, thereby drastically mitigating the risk of severe accidents.

The European Union’s policy response: the COM/2026/117 strategy and the industrial alliance

The convergence of climate urgency and the imperative to revitalize industrial competitiveness in the energy sector has prompted European Union institutions to adopt a proactive stance toward next-generation nuclear energy. With the adoption of the official strategy COM/2026/117 (“Strategy for the development and deployment of Small Modular Reactors in Europe”) alongside estimates set out in the PINC COM/2026/120 program, the European Commission has established a nine-point action plan aimed at bringing Europe’s first SMRs online by the early 2030s. The EU estimates that installed SMR capacity in Europe could reach between 17 GW and 53 GW by 2050, contributing not only to electricity generation but also to the decarbonization of hard-to-abate sectors, hydrogen production, and industrial district heating. Concurrently, the consolidation of the European Industrial Alliance on SMRs—supported by strategic calls for project selection—aims to establish a supranational manufacturing supply chain, preventing market fragmentation across individual member states and safeguarding European technological sovereignty.

Economies of scale, investment models, and the economic question

Despite theoretical promises, the economic analysis of SMRs reveals a significant economic paradox that must be rigorously addressed. Reducing reactor capacity inevitably forfeits traditional physical “economies of scale”: a smaller reactor generates fewer kilowatt-hours per kilogram of steel and concrete utilized compared to a giant conventional power plant. For SMRs to become economically competitive against large reactors and renewable energy sources, the sector must compensate for the loss of economies of scale through “economies of series” and the learning rate. This implies that unit cost reductions will materialize only on the condition that hundreds of identical units are manufactured and deployed at scale. Cooperative financing models—such as the Finnish Mankala model or the Swedish Industrikraft model, cited in European Union analyses—suggest the possibility of consortia of large industrial energy consumers directly investing in SMRs to secure long-term, fixed-cost energy supplies. However, without a sufficiently large and binding order pipeline, initial SMR prototypes risk incurring substantial cost overruns, just like the conventional, large reactors.

The unresolved waste issue: radioactive emissions of SMRs

A core and frequently contentious issue concerns environmental impact and spent fuel management. Although promotional narratives from industry stakeholders tend to associate small-scale reactors with a drastic reduction in radioactive waste, independent scientific studies—including the notable Stanford University research published in Proceedings of the National Academy of Sciences (PNAS) by Krall, Macfarlane, and Ewing—have challenged this oversimplification. Physical analysis of the fuel cycle demonstrates that due to the reduced dimensions of the core, SMRs inherently suffer from higher neutron leakage compared to large light-water reactors. This loss of neutron efficiency implies that many SMRs currently under development will generate a relatively higher volume of low- and intermediate-level radioactive waste per unit of electricity produced—up to several times higher. Moreover, the use of higher-enriched fuels or chemically reactive coolants in advanced reactors can complicate temporary storage and chemical conditioning operations, making the establishment of deep geological repositories an unresolved challenge regardless of reactor size.

Regulatory fragmentation and licensing challenges in the single market

Beyond financial and technical obstacles, the future of the European nuclear industry heavily depends on the regulatory framework and licensing processes. Europe currently exhibits a highly fragmented regulatory landscape, in which national nuclear safety authorities (such as France’s ASN, Finland’s STUK, or Spain’s CSN) retain full sovereignty over plant assessment criteria. If an SMR design must be re-engineered or subjected to lengthy and expensive modifications to satisfy the specific regulatory requirements of each individual member state, the advantages of mass production and factory standardization immediately evaporate. To overcome this impasse, recent European initiatives propose establishing “regulatory coordination” and implementing regulatory sandboxes under the Net-Zero Industry Act, facilitating joint and early project reviews among national authorities. Nevertheless, harmonizing nuclear safety requirements across member states with historically divergent environmental and energy priorities remains one of the most complex tasks ahead.

Between energy pragmatism and scientific rigor

In conclusion, the European nuclear industry stands at a historic crossroads. Traditional large reactors have demonstrated that reliance on complex megaprojects exposes the sector to financial risks that the private market struggles to bear alone. Hence very few orders for new reactors. On the other hand, Small Modular Reactors, SMRs, represent a promising paradigm shift that should not, however, be viewed as an issue-free solution.

The effectiveness of SMRs in contributing to European decarbonization will depend on industrial policy’s capacity to build an integrated single market capable of standardizing technologies, sharing supply chains, and harmonizing safety regulations without compromising scientific rigor.

To formulate balanced and non-partisan energy policies, European decision-makers must integrate evaluations of SMR costs and technological opportunities with transparent management of the spent fuel and waste cycle. Only through a pragmatic approach stripped of ideological dogmatism can the European Union determine whether—and to what extent—next-generation nuclear power will form the backbone of its future energy sovereignty.

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Massimiliano Cintura is a Global Policy Institute fellow. He received his MA in International Studies in 2025, from the University of Turin, Italy, with a dissertation on Frontex (the European Border and Coast Guard Agency). Prior to that he earned a BA in International Science, Development and Cooperation in 2023, with a dissertation on Eurojust (the European Union Agency for Criminal Justice Cooperation), also from the University of Turin. His areas of expertise and research focus include: International Relations, Global Affairs, Migration, Defense and Security issues.

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