Stolac Solami PV-park in Bosnia and Herzegovina is expected to deliver up to 12% more energy thanks to ABC module technology. ©AIKO

The Stolac Solami Park in Bosnia and Herzegovina marks a milestone as AIKO and Tibra Pacific achieve grid connection for Europe’s first utility-scale solar power plant based on back-contact technology, promising greater efficiency and profitability.

Munich, 11 June 2025

AIKO, a global company known for developing and producing high-efficiency solar technology and as the inventor of N-Type ABC (All Back Contact) technology, supplied modules for the Stolac Solami Park project developed by Tibra Pacific. With an installed capacity of 64 MW, it is currently the largest grid-connected ground-mounted PV plant in Bosnia and Herzegovina. Launched in 2024, the project utilizes AIKO’s Stellar 1N+ ABC modules, renowned for their high efficiency and long-term reliability. The PV modules are installed on a classic fixed-tilt ground-mounted substructure with an optimized layout for maximum energy yield.

Simulation over three decades provides evidence

A 30-year simulation comparing AIKO’s ABC modules with TOPCon reference systems demonstrated a consistent performance advantage. The total energy production of the AIKO ABC modules reached 2,564.35 GWh in the simulation, corresponding to an energy gain of 38.54 GWh, or 1.54%, compared to the TOPCon system (Tunnel Oxide Passivated Contact). The yield increase was 0.80% in the first year, with this advantage expected to increase over time. This long-term performance advantage leads to higher overall system performance and improves energy security throughout the plant’s operating life, experts say. Additionally, the ABC system’s high-power density and larger active module area result in fewer modules per installed megawatt, fewer strings, less mounting system, less installation components, and less cabling. These factors further improve the overall efficiency of this solar farm.

Higher returns

In addition to their technical performance, AIKO’s ABC modules offer significant financial benefits, including a shorter payback period of 16 years and 4 months compared to 17 years and 3 months for TOPCon systems, a lower cost of electricity (LCOE) due to higher energy yields and reduced balance-of-system (BOS) costs, and an improved return on investment (ROI) over the project’s lifetime. These advantages make the ABC system a more bankable and economically efficient choice for utility developers seeking to maximize long-term value.

Better durability

Designed for harsh and variable conditions, AIKO’s modules are expected to demonstrate excellent durability against typical installation stresses, temperature fluctuations, and mechanical loads at the project site. Their uniform ABC design should also enhance resistance to micro-cracks and more effectively suppresses hotspots than conventional technologies. The standardized size of 2382×1134 mm and thickness of 30 mm shall ensure compatibility with common mounting systems.

Milestone with 12 percent more electricity yield says chairman

„This project is a milestone for renewable energy in Bosnia and Herzegovina,“ said Robert Brajkovic, Chairman of Tibra Pacific. „As the largest operating ground-mounted PV plant in the country, we needed a technology that would perform reliably not only in the lab but also in the field. AIKO’s modules deliver 12 percent more energy output and help reduce electricity costs by 3 percent in the first phase compared to the TOPCon setup. As a result, we converted the entire second phase to ABC. Their number-one efficiency and consistency under real-world conditions set a new benchmark for us.“

Manfred Gorgus