Serbia is starting two energy programmes with very different construction timelines but a common strategic purpose. A future nuclear fleet would provide large volumes of low-carbon baseload electricity. The proposed Đerdap 3 pumped-storage plant would supply the flexibility required to manage renewable generation, peak demand and system balancing.
The country removed its 35-year nuclear moratorium in 2024. The first phase of the national nuclear programme is expected to be completed by the middle of 2027, covering the information and institutional work needed to determine the development path. Technology and reactor designs could be selected by 2032, with construction targeted from 2035.
The programme is being developed with the International Atomic Energy Agency, Serbia’s radiation and nuclear-safety directorate and EDF. A preliminary viability study has already been completed. EDF is expected to prepare another four studies during the first phase, followed by an additional fourteen, indicating the scale of work required before a site, technology or financing structure can be selected.
The challenge is not simply engineering. Serbia needs an independent regulator, nuclear legislation, environmental and emergency-response frameworks, waste and fuel policies, a trained workforce and long-term supply-chain arrangements. These capabilities must exist before construction rather than being assembled during the project.
The financing environment is equally demanding. Global nuclear investment is currently around $75 billion annually, while the industry estimates that spending must reach roughly $250 billion a year to deliver national targets. New plants remain difficult to finance because of long construction periods, cost-overrun risk and the need to create a bespoke public-private structure for each project.
Serbia’s programme will therefore need to decide whether it is pursuing one large reactor, a fleet approach, small modular reactors or participation in a regional project. The fleet model offers standardisation and lower unit costs, but requires a much larger long-term capital commitment. A single first-of-a-kind unit may appear more manageable but carries higher financing and construction risk.
Đerdap 3 is more immediate. The Ministry of Mining and Energy has opened procurement for planning and technical documentation, including a pre-feasibility study, project design, special-purpose spatial plan and strategic environmental assessment. Earlier analyses have considered an installed capacity between 1,200 MW and 2,400 MW.
The project would be integrated into the existing Đerdap hydropower and navigation complex operated jointly with Romania. That creates substantial cross-border requirements. The design must assess impacts on Đerdap 1 and Đerdap 2, water management, navigation, environmental conditions and the allocation of hydropower potential between the two countries.
Pumped storage and nuclear should not be treated as competing options. Đerdap 3 could enter service earlier and absorb surplus renewable electricity, supply peak demand and provide ancillary services. Nuclear would contribute later as a stable low-carbon source capable of supporting industrial demand and reducing import exposure.
The principal risk is sequencing. Serbia needs sufficient grid reinforcement, market reform and flexible capacity before large volumes of wind and solar are connected. It also needs nuclear institutions many years before any reactor begins construction. These programmes will be judged less by headline capacity than by whether governance, documentation and financing progress in the correct order.
