Three major Serbian infrastructure investments have reached a combined contract value or estimated cost of approximately €6.3 billion, with significant differences between their initial financial projections and subsequent commitments. The Morava Corridor, Belgrade–Zrenjanin–Novi Sad motorway and Đerdap 3 pumped-storage hydropower project are at different stages of development, but all raise questions about project preparation, cost control and public investment management.
An assessment published by Forbes Srbija, drawing on analysis by an adviser to Serbia’s Fiscal Council, identifies potential weaknesses in feasibility studies, technical design, contractor selection and financial oversight.
The figures do not represent directly comparable cost overruns. In particular, the motorway projects underwent different changes in scope, while Đerdap 3 remains at the preparation stage. Together, however, they illustrate the financial risks of committing to major investments before technical specifications, construction risks and financing arrangements are sufficiently established.
Morava Corridor estimate reaches €2.1 billion
The Morava Corridor, being constructed by the Bechtel–Enka consortium, has experienced a substantial increase in its estimated investment cost. Initial planning placed the project at approximately €800 million, while the subsequent commercial agreement established a contract value of €943 million. Government fiscal planning documents for 2026 put the estimated project cost at approximately 252 billion dinars (€2.1 billion).
The latest estimate is more than 120% above the original contract value and approximately 160% higher than the initial planning estimate.
Physical completion has exceeded 92%, limiting the scope for major redesign or changes to the project. Additional works were included in the original arrangements, while subsequent increases have been associated with inflation, pandemic-related disruption, international construction-market conditions and contractual price-adjustment mechanisms.
These factors can raise costs on complex infrastructure schemes involving earthworks, bridges, river regulation and substantial construction-material requirements. The available figures do not establish how much of the approximately €1.16 billion difference between the original contract and the latest estimate results from inflation, additional works, changed quantities, design modifications or other contractual adjustments. Separating these components is necessary to assess the reasons for the increase and the effectiveness of project cost controls.
Motorway redesign increases investment to €1.6 billion
The Belgrade–Zrenjanin–Novi Sad project illustrates the financial implications of changing the technical scope of an infrastructure investment. The original concept envisaged a fast-road connection, with preliminary costs estimated at approximately €210 million across the relevant sections. The plan was subsequently upgraded to a full motorway.
A commercial contract signed with China Shandong International Economic and Technical Cooperation Group established a value approaching €1.6 billion excluding VAT. The project covers approximately 105 kilometres of motorway and associated infrastructure, including a parallel road along part of the route. The difference between the initial €210 million estimate and the later contract value cannot be treated as a conventional construction cost overrun because the two figures relate to substantially different technical solutions.
The revised investment case depends on whether the higher-standard motorway can generate sufficient additional economic benefits to justify its cost. Relevant factors include projected traffic and freight volumes, travel-time savings, regional industrial development and the alternative value of constructing a lower-cost expressway.
Subsequent annexes addressed payment terms, project phases, financing and the scope of works. Some arrangements were developed after the main contract had been signed. Although phased contracting is not inherently problematic, its financial implications depend on the clarity of the original quantities, unit prices, technical requirements and procedures for approving changes. With construction progress estimated at approximately 10%, the project still offers more opportunity for independent technical and economic reassessment than the nearly completed Morava Corridor. Any redesign would nevertheless need to account for existing contractual commitments, cancellation liabilities and the cost of changes already implemented.
Đerdap 3 estimate increases before construction
The proposed Đerdap 3 pumped-storage hydropower plant has seen its estimated investment cost rise from approximately €1.4 billion to €2.6 billion, an increase of around 86%.
The project remains in the preparation and technical-documentation stage, meaning the increase cannot primarily be attributed to construction overruns or contractor claims arising from completed works.
Pumped-storage facilities require detailed geological, hydrological, civil-engineering and electrical-system assessments. Their costs depend on underground construction, reservoirs, high-voltage equipment, grid connections, environmental requirements and construction methods.
Early estimates can change as technical investigations establish more demanding conditions. The scale of the revision raises questions about the reliability of the original estimate and the maturity of the current €2.6 billion investment baseline. The project’s economic case also depends on electricity-market conditions. Pumped-storage plants store electricity when prices are relatively low and generate power when demand and prices increase. They can additionally provide reserve capacity, balancing services and flexibility for the wider power system.
Serbia’s expanding renewable generation capacity could increase demand for these services, but the project’s financial viability will depend on future electricity-price differences, operating efficiency, utilisation and the value assigned to system-security benefits. The investment also needs to be assessed against alternative flexibility options, including battery storage, grid reinforcement and demand-response solutions, before a final construction commitment.
Project preparation and contract governance remain central concerns
The three investments highlight the importance of establishing sufficiently developed technical and financial baselines before contractors are selected and major commercial commitments are made. When engineering designs and quantities remain incomplete, public investors can face greater exposure to unforeseen geological conditions, land acquisition requirements, design changes, construction delays, price increases and additional infrastructure needs.
Some variations are unavoidable in complex engineering projects. Effective oversight requires clear allocation of foreseeable risks and independent verification of the reasons for additional expenditure.
Major infrastructure schemes generally require traceable technical approvals, cost estimates, risk allowances, design modifications, contractual variations and certified payments.
Independent engineering and financial reviews can compare original project baselines with subsequent changes, establishing whether additional costs reflect verified modifications in scope, quantities, market prices or technical conditions. They can also assess whether contractors, designers and public authorities have met their contractual responsibilities. The use of special legal arrangements for major infrastructure projects in Serbia has reduced reliance on some conventional competitive procurement and oversight procedures. This increases the importance of transparency surrounding contract amendments, pricing mechanisms and independent supervision.
Capital spending increases pressure on public finances
Serbia’s revised 2026 budget allocates approximately 779.9 billion dinars (€6.6 billion) to public capital investment across the general government sector, equivalent to around 7% of GDP.
Infrastructure expenditure remains a major component of the country’s economic development strategy, supporting construction activity, regional connectivity and industrial development. Rising project costs can reduce the funding available for other investments without necessarily producing equivalent additional economic benefits. They can also increase future debt-servicing requirements, particularly when projects rely on external borrowing.
The combined €6.3 billion value of the three projects represents their current contract values or investment estimates, not the amount of additional expenditure caused by cost increases or the sum already spent. The nearly completed Morava Corridor requires reconciliation of its original and revised costs. The Belgrade–Zrenjanin–Novi Sad motorway requires further assessment of its economic justification and outstanding contractual commitments while construction remains at an early stage. For Đerdap 3, the priority is to establish a credible technical design, investment estimate and financial model before construction begins.
