The Croatian oil company INA has commenced live-process testing at its Rijeka oil refinery, marking a pivotal moment in its largest industrial investment to date, valued at approximately €700 million. This testing phase is crucial as it involves the operation of the new heavy residue processing unit, which is undergoing final checks before full commissioning. The refinery’s trial operations are scheduled to begin in March 2026.
This live testing follows extensive cold testing and includes the methodical introduction of steam, water, and fuel gas, culminating with petroleum products. During this phase, all systems are monitored under rigorously controlled conditions to ensure process stability and equipment reliability while assessing the performance of automation and safety systems.
INA regards this stage as one of the most technically challenging aspects of the upgrade project. Upon completion of testing, the refinery complex is expected to reach its nominal capacity within 2026. This investment represents not only INA’s largest financial commitment but also stands out as one of Croatia’s most significant industrial endeavors.
The modernization initiative encompasses a comprehensive overhaul of the Rijeka facility, including enhancements to existing infrastructure, new port facilities, storage silos, an enclosed coke transport system, and a new electricity substation—the largest in Croatia. These improvements are set to transition the refinery into a highly advanced facility characterized by enhanced energy efficiency and increased production of high-value products.
Once fully operational, the upgraded unit is anticipated to boost diesel production by up to 30%, thereby reducing Croatia’s reliance on fuel imports during critical periods such as the summer tourist season. Additionally, this project aims to diminish the need for importing vacuum gas oil from European markets—historically sourced from Russia—thereby bolstering national energy security.
