Belgrade Suspends €45.3 Million Trolleybus Tender Following Procurement Complaint

GSP Beograd has suspended its €45.3 million tender for 60 new trolleybuses following a legal challenge by a prospective supplier, creating uncertainty over the timing of Belgrade’s electric public transport fleet renewal. The procurement is intended to introduce low-floor vehicles with battery systems that allow operation beyond the existing overhead electricity network.

The estimated contract value corresponds to approximately €755,000 per vehicle, although the final expenditure will depend on submitted bids, contractual terms and the equipment and services included. The tender was launched in September, with bids scheduled to be opened. The process was suspended after a prospective bidder requested legal protection under Serbia’s public procurement legislation.

The complaint was submitted to the Republic Commission for the Protection of Rights in Public Procurement Procedures. The suspension does not constitute a cancellation of the tender or establish that GSP breached procurement rules, but the process cannot proceed normally until the relevant review allows it to resume.

Delivery Schedule Faces Further Uncertainty

The original tender required the first 20 trolleybuses within 420 days of the contract entering into force, followed by delivery of all 60 vehicles within 540 days. The schedule envisaged initial deliveries after approximately 14 months and completion within around 18 months of the contractual start. The suspension introduces uncertainty because the duration of the commission’s review remains unknown.

Depending on the outcome, the procurement could resume under the existing conditions, require amendments or undergo additional procedural steps. The identity of the complainant and the specific grounds of the challenge have not been established in the available reporting. The dispute illustrates how procurement proceedings can affect infrastructure investment before a supply contract is awarded. Delays may extend the operating life of older vehicles and increase maintenance requirements, while suppliers face uncertainty over manufacturing schedules, equipment procurement and production capacity.

Battery-Equipped Trolleybuses Add Operational Flexibility

The estimated €45.3 million investment would introduce vehicles capable of operating both on conventional overhead electricity lines and independently using onboard batteries. This technology could allow trolleybuses to bypass sections of disrupted infrastructure, operate around roadworks and accidents, and potentially serve routes without requiring additional overhead wiring.

Belgrade could therefore retain much of its existing electric transport infrastructure while increasing operational flexibility. The system could also reduce disruption when vehicles need to leave their regular routes because of traffic incidents or temporary infrastructure problems. The benefits will depend on battery range, the proportion of routes that can be operated independently, and the effectiveness of depot maintenance and charging arrangements. Vehicle technology alone cannot guarantee better passenger services without reliable timetables, infrastructure maintenance and sufficient operating capacity.

Life-Cycle Costs Will Determine Procurement Value

At approximately €755,000 per trolleybus, the estimated purchase price needs to be assessed alongside technical performance, expected service life and total operating expenditure. Battery systems introduce costs associated with procurement, battery management, thermal management, specialised maintenance and eventual replacement. These expenses must be considered alongside electricity consumption, infrastructure requirements, vehicle reliability and residual value.

A lower purchase price does not necessarily translate into lower long-term expenditure if maintenance costs are high or battery replacement is frequent. Conversely, a more expensive vehicle could provide better value if it offers higher availability, lower energy consumption and reduced maintenance requirements. The procurement’s economic justification therefore depends on measurable operating benefits and whole-life costs rather than the initial acquisition price alone.

Tender Follows Debate Over Private Trolleybus Operations

The procurement follows a dispute over proposals to transfer trolleybus operations to private operators through a public-private partnership. During 2026, GSP employees opposed the proposed arrangement, arguing that the city should invest directly in new vehicles and retain the existing public operating system. Following discussions with government and municipal representatives in July, the proposal was halted, and purchasing new trolleybuses became a central element of the alternative approach.

The tender consequently concerns both fleet replacement and the future organisation of Belgrade’s public transport operations.

Direct public procurement requires the city to finance the initial vehicle purchase and subsequent maintenance. A privately operated model would allocate investment obligations, operating risks and contractual responsibilities differently. Neither approach is automatically more cost-effective. A meaningful comparison would require an assessment of total public expenditure, asset ownership, service availability, contract duration and the financial obligations retained by the city.

Municipal Budget Faces Competing Investment Demands

Belgrade’s original 2026 city budget amounted to approximately €1.75 billion. The trolleybus procurement represents around 2.6% of that amount, although this comparison does not establish the project’s actual financing schedule or funding source. The expenditure competes with investment requirements for roads, utilities, public services, the metro programme, other public transport vehicles and electric mobility infrastructure.

Financing terms are particularly important because municipal transport delivers economic and public-service benefits that are not necessarily reflected in commercial revenues. Belgrade introduced free public transport in 2025, making the system particularly dependent on budget funding and related financial arrangements. The trolleybus programme must therefore be assessed through service availability, operating efficiency, public expenditure and wider economic benefits rather than direct fare income alone.

Potential savings could result from lower maintenance requirements for ageing vehicles, improved fleet availability and reduced energy expenditure compared with alternative transport technologies. Those savings must be measured against vehicle acquisition costs, battery replacement and continued maintenance of the overhead network. The published tender estimate does not establish the project’s total long-term financial commitment.

Procurement Review Will Determine the Next Steps

Major rolling-stock and electric-vehicle purchases generally involve a limited number of manufacturers capable of meeting demanding technical and delivery requirements. Public authorities must balance equipment reliability with the obligation to maintain fair competition. Overly restrictive technical specifications can deter suppliers, while inadequate requirements may result in unreliable vehicles and higher long-term costs. The commission’s review will determine whether the suspended tender can proceed on its current basis or requires further action.

The existence of a complaint does not itself establish that the procurement was improperly designed. Transparent rules and predictable procedures remain important for suppliers and investors participating in municipal infrastructure programmes. For GSP Beograd and the city government, the next stage depends on resolving the legal challenge while maintaining a competitive procurement process. The planned acquisition is intended to renew the fleet and improve the use of Belgrade’s existing electric transport infrastructure, with the financial outcome dependent on vehicle performance, delivery and long-term operating costs.