Serbia is advancing two energy programmes with different construction timelines but a shared strategic purpose. A future nuclear fleet is intended to provide low-carbon baseload electricity. The proposed Đerdap 3 pumped-storage plant is designed to add flexibility for renewable generation, peak demand and system balancing.
Nuclear programme timeline and preparatory work
Serbia 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 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.
The scope extends beyond engineering requirements. 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 be in place before construction rather than being assembled during the project.
Financing considerations for new nuclear capacity
The financing environment described for nuclear investment is demanding. Global nuclear investment is currently around $75 billion annually, while industry estimates indicate spending must reach roughly $250 billion a year to deliver national targets. New plants are described as difficult to finance due to long construction periods, cost-overrun risk and the need for bespoke public-private structures for each project.
Serbia’s approach will need to address whether it pursues one large reactor, a fleet model, small modular reactors or participation in a regional project. The fleet approach is described as offering standardisation and lower unit costs, but requiring a larger long-term capital commitment. A single first-of-a-kind unit is described as potentially more manageable while carrying higher financing and construction risk.
Đerdap 3 pumped-storage procurement and cross-border scope
Đerdap 3 is at an earlier stage than the nuclear build-out timeline. The Ministry of Mining and Energy has opened procurement for planning and technical documentation, including a pre-feasibility study, project design, a special-purpose spatial plan and a strategic environmental assessment. Earlier analyses have considered an installed capacity range of 1,200 MW to 2,400 MW.
The project would be integrated into the existing Đerdap hydropower and navigation complex operated jointly with Romania. Cross-border requirements are described as substantial for the design assessment. The design must evaluate impacts on Đerdap 1 and Đerdap 2, water management, navigation, environmental conditions and how hydropower potential would be allocated between the two countries.
System role of pumped storage alongside nuclear
Pumped storage and nuclear are presented as complementary rather than competing options. Đerdap 3 could enter service earlier to absorb surplus renewable electricity, supply peak demand and provide ancillary services. Nuclear would contribute later as a stable low-carbon source supporting industrial demand and reducing import exposure.
The principal risk highlighted is sequencing across both programmes. 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 are described as being judged less by headline capacity than by whether governance, documentation and financing progress in the correct order .
