Belgrade’s Nikola Tesla Airport will reconstruct its principal transformer station to secure additional electricity for an expanding terminal, aircraft stands and commercial facilities, making energy infrastructure the latest constraint on the Serbian capital’s growth as a regional aviation hub.
The airport said in its financial report that development of the complex and construction of new facilities were increasing electricity consumption beyond the capacity that its existing system was designed to support.
A review commission has issued a positive opinion on the preliminary design for the transformer reconstruction. The airport has not disclosed the project’s capacity, estimated cost, financing structure or construction timetable.
The upgrade is more consequential than an ordinary utility project. Electricity supports baggage handling, passenger processing, security systems, airfield lighting, cooling and ventilation, retail facilities and the equipment used to service aircraft at their stands. A capacity shortage or supply interruption can therefore disrupt the airport even when its runways remain available.
Nikola Tesla operates its own closed electricity-distribution system under a licence from Serbia’s energy regulator. Belgrade Airport, the Vinci Airports subsidiary holding the operating concession, manages the internal network of medium and low-voltage substations serving users throughout the complex. Biznis.rs
Terminal and apron expansion is raising the load
The power project follows a multiyear modernisation programme that has expanded the terminal by about 40,000 sq metres and added gates, aircraft stands, commercial space and a second runway.
Vinci has invested more than €366mn in the airport since taking over operations in 2018 under a 25-year concession.
The next phase centres on the C pier and apron. Three gates with passenger boarding bridges and four aircraft stands are being added, together with approximately 5,350 sq metres of terminal space.
Work on the apron is scheduled to finish by the end of 2026, followed by testing and regulatory inspection. Commissioning is planned for the end of March 2027.
The project includes fixed electrical supplies for parked aircraft, underground fuel infrastructure, apron lighting and navigation signals. Ground power allows aircraft to switch off their auxiliary engines while at the gate, reducing fuel use, local emissions and noise. It also transfers more energy demand to the airport’s electricity system.
Separate work at Terminal 1 will add an international bus gate. Once the current Terminal 1 and Terminal 2 projects are complete, the airport expects to have 37 gates.
Vinci is also expanding commercial areas, which increase demand from lighting, refrigeration, kitchens, ventilation and retail tenants even when passenger processing is not at its peak.
These additions explain why the main transformer station has become a development priority. Building gates without sufficient electricity would create nominal capacity that could not be operated reliably.
Traffic is advancing faster than the original expansion cycle
Nikola Tesla handled 4.2mn passengers during the first half of 2026 after traffic increased 8.8 per cent in the first quarter.
The airport served almost 8mn passengers in 2023, compared with 6.2mn in 2019. Its network expanded from 72 destinations in 2019 to 116 in 2024, supported by the growth of Air Serbia, low-cost carriers and new long-haul services.
The current summer network includes 118 destinations. Air Serbia has continued adding routes in Europe and plans further long-haul growth, while foreign airlines have expanded capacity into Belgrade.
The airport’s location gives it a plausible role as a transfer hub between western Europe, the Balkans, the Middle East and parts of Asia. Serbia’s position outside the EU can also allow Air Serbia to serve some markets and traffic flows differently from EU-based carriers.
But rapid growth compresses infrastructure planning cycles. Terminal additions produce visible passenger capacity, while power, fuel, baggage and wastewater systems must be expanded in parallel and often take longer to design and permit.
The transformer project suggests that the airport is moving from a one-off modernisation programme to continuing incremental expansion.
Existing on-site generation covers only part of demand
Nikola Tesla has a 1MW solar plant with about 3,000 panels, commissioned in 2022. It generates approximately 1.13GWh a year, comparable with the annual electricity use of about 430 households.
The airport has also replaced most of its lighting with LEDs and installed solar-powered lighting in parking areas. A trigeneration plant supplies electricity, heating and cooling while replacing older heavy-fuel boilers with natural gas.
These investments have reduced emissions and exposure to purchased power. They do not remove the need for a stronger transformer station and grid connection.
The photovoltaic plant produces most strongly during daylight and summer, when cooling demand is high, but its output varies with the weather and falls to zero at night. Airport operations require reliable electricity around the clock.
Battery storage could shift some solar output into evening hours and provide short-duration support, but it would not substitute for adequate grid and transformer capacity.
Critical functions already have uninterruptible power systems and backup generators. These are designed to maintain safety during an outage rather than supply the full terminal complex economically for prolonged periods.
The transformer reconstruction must therefore provide both additional capacity and redundancy. A large airport cannot rely on a single point of failure when passenger systems, runway lighting or security infrastructure are operating.
The concession determines who carries the investment risk
Nikola Tesla has an unusual corporate structure.
State-controlled Aerodrom Nikola Tesla remains the asset owner and supervises performance of the concession contract. Belgrade Airport, controlled by France’s Vinci, operates and develops the airport under the long-term concession.
The financial responsibility for the transformer upgrade will depend on whether it is classified as a mandatory concession investment, an extension required by subsequent traffic growth or shared infrastructure outside the original programme.
The published information does not identify the party financing the work.
If the reconstruction forms part of Vinci’s contractual obligations, the concessionaire will have to absorb the capital cost and recover it through future airport revenue. If it requires changes to the concession or public co-financing, the allocation of cost and risk will need to be transparent.
The distinction matters because airports can recover investment through passenger charges, airline fees, retail rents and other commercial revenue. Higher infrastructure expenditure may eventually create pressure for increased charges, particularly if passenger growth slows before the new capacity is fully used.
Conversely, delaying the power project could constrain airline schedules and commercial expansion, reducing concession income and the fees received by the state.
Aerodrom Nikola Tesla separately raised €32mn through a new share issue earlier in 2026, with the Serbian state providing about two-thirds of the capital. Those funds were linked to plans for reconstructing and expanding the Museum of Aviation rather than explicitly to the transformer project.
Decarbonisation will increase electricity demand further
Vinci aims to halve the airport’s carbon footprint by 2030 and achieve net-zero emissions for its own operations by 2050.
Nikola Tesla has reached Level 3 Optimisation under the Airport Carbon Accreditation programme, which extends carbon management to airlines, ground handlers and concessionaires.
Further decarbonisation is likely to raise electricity demand before it reduces total energy consumption.
Replacing diesel ground vehicles with electric alternatives requires charging infrastructure. Supplying aircraft with electricity and conditioned air at the gate transfers energy use from jet fuel to the airport. Electrifying heating could eventually reduce reliance on the gas-fired trigeneration system but increase winter peak demand.
The transformer reconstruction should consequently be designed for future electrification rather than only the facilities currently under construction.
It must also determine how much renewable power can be integrated on site. The existing 1MW solar installation occupies 15,900 sq metres, suggesting that materially larger output would require terminal roofs, car-park canopies or additional land.
A long-term power-purchase agreement could supply renewable electricity without using airport land. It would not solve the physical constraint unless the internal distribution network and external connection can carry the additional load.
Nikola Tesla’s immediate expansion remains on schedule, with the C apron expected to enter service in March 2027. The transformer project has yet to receive a disclosed budget or delivery date.
The airport has demonstrated that it can add passenger and aircraft capacity while maintaining traffic growth. Its next test is less visible but equally important: ensuring that the energy system underneath the expanded complex is large and resilient enough to operate it.
