The energy landscape in Bosnia and Herzegovina is set for a significant transformation with the announcement from Elektroprivreda Republike Srpske (ERS), the state-owned power utility, regarding an international tender for the Trebinje 3 solar power plant. This project entails not only the establishment of a solar facility with an installed capacity of 53.63 MW but also the construction of a new substation and a high-voltage transmission connection. The anticipated investment for this initiative is approximately €32 million, excluding VAT, with bids due by 14 April 2026.
The project will adopt an EPC+F model, wherein a single contractor will be responsible for engineering, procurement, construction, and financing. This approach aims to streamline project execution while ensuring that the contract is awarded based on the most economically advantageous offer, thus balancing cost efficiency with technical quality.
The Trebinje 3 facility is expected to generate around 85.5 GWh annually, capitalizing on the region’s favorable climatic conditions that make it one of the most appealing sites for photovoltaic investments in southeastern Europe. The successful contractor will be tasked with comprehensive technical documentation preparation, equipment supply and installation, civil engineering works, and all necessary services to bring this solar plant into commercial operation.
A key aspect of this development includes a new 220/20 kV Zupci substation, which will be constructed alongside enhancements to existing infrastructure at the Trebinje substation. Additionally, the project encompasses building a new 220 kV transmission line that will connect Trebinje and Zupci, involving route planning, tower foundations, structural assembly, electrical equipment installation, and commissioning works essential for integrating the solar facility into the national grid.
The completion of this project will involve rigorous testing and commissioning processes, underpinned by continuous technical supervision and quality control throughout construction. A concession agreement was signed in April 2025, allowing for a 46-year operating period from commissioning. This initiative aligns well with the broader strategy of the Republic of Srpska to enhance renewable energy generation capacity while strengthening grid stability and ensuring long-term energy security in the region.
