Nuclear energy offers a strong economic proposition—delivering large-scale, low-carbon dispatchable electricity with high reliability and long-term cost predictability. Existing nuclear power plants are among the most efficient and cost-competitive sources of electricity in both regulated and liberalised markets, consistently achieving high-capacity factors and providing dependable supply regardless of fuel and electricity price fluctuations.
While new nuclear construction involves substantial upfront investment—most of a plant’s lifetime costs are incurred before it begins operation, often representing as much as 70% of total costs—this front-loading also brings decades of stable, low-cost electricity, largely shielded from the volatility of global energy markets. High upfront costs require a stable long-term perspective. However, with the right financing structures and frameworks for risk-sharing, especially during the construction period, capital costs can be contained to support affordability and investor confidence.
Once operational, nuclear plants benefit from very low variable costs, enhancing their competitiveness over the long term. For this reason, Long-Term Operation (LTO) reactors can offer substantial economic and environmental benefits. LTO programs typically require careful monitoring, with components repaired or replaced to ensure continued safety and performance.
The advent of small modular reactors (SMRs) is also introducing new opportunities to deliver nuclear energy to new markets and applications. With smaller unit size, modular construction, and potential for factory fabrication, SMRs offer the potential for lower initial investment, shorter construction times, and reduced overall financial risk—especially for smaller grids, remote areas, or industrial applications.
Importantly, nuclear energy also stands out in its responsible approach to lifecycle costs. Unlike fossil fuel generation, the nuclear industry plans and funds the full costs of decommissioning, spent fuel management, and long-term disposal of high-level waste from the outset.
The Nuclear Energy Agency (NEA) collaborates closely with member countries and international experts to provide analysis on the economic viability of nuclear power generation. This includes comprehensive analysis of the entire nuclear fuel cycle, from uranium resource exploration and fuel fabrication to plant construction, operation, maintenance, waste management, and eventual decommissioning. Recent examples of work in this area include:
System-Level Cost Modelling
The NEA has developed robust modelling methodologies to assess how nuclear fits into integrated low-carbon energy systems. Its Country-Specific System Cost Modelling initiative uses electricity market scenarios to identify optimal generation mixes and CO₂ targets. A guide released in March 2024 demonstrates how technologies like nuclear, renewables, and storage interplay under carbon constraints.
Economics of Long-Term Operation of Existing Reactors
The NEA investigates the economic viability of the long-term operation (LTO) of existing reactors. It analyses the policy, regulatory, and performance implications of LTO programs aimed at maximising economic value from existing nuclear assets.
Nuclear Financing
The NEA stays abreast of global financing strategies, aiming to establish a common vocabulary and basis for comparative analysis to identify and discuss key lessons learnt about the relative merits of different approaches to financing nuclear projects. NEA work on financing has concentrated in recent years on the analysis of different risks in nuclear new build and their optimal allocation and management. This includes identifying the “building blocks” that policymakers and private sector decision makers need to leverage to line up financing to meet objectives for new nuclear.
SMR Industrial Case Studies
The NEA analyses real-world applications of nuclear energy, notably for Small Modular Reactors (SMRs) in specific sectors. These case studies pair detailed economic modelling with lessons from analogous industries to evaluate cost, deployment strategies, and scalability.
Tracking SMR Developments
The NEA’s Small Modular Reactor (SMR) Dashboard is a data-driven tool assessing real-world progress of SMR designs—not just technical feasibility, but readiness for commercialisation. This includes a “Digital Dashboard” launched in July 2025.
