Croatia is strengthening its position as an emerging gas hub in south-east Europe through a coordinated expansion of LNG infrastructure, pipeline capacity and regional interconnections. The completion of construction works on the Zabok–Lučko main gas pipeline is part of a broader investment programme worth approximately €530mn. The programme is intended to reinforce Croatia’s role as an energy transit corridor for Hungary, Slovenia and Bosnia and Herzegovina while enhancing regional supply security.
The infrastructure build-out includes upgrades to LNG import capability at the Krk terminal. Croatia has increased the terminal’s capacity from 2.9 bcm/year to 6.1 bcm/year, improving access to global LNG cargoes. Additional transmission projects are designed to move that supply towards regional demand centres.
Pipeline capacity upgrades for Hungary and export flows to Slovenia
Completion of the Bosiljevo–Sisak and Sisak–Kozarac pipeline projects will raise gas transmission capacity towards Hungary to 3.5 bcm/year. Export capacity towards Slovenia is set to increase to 1.5 bcm/year. While these volumes are smaller than those in larger European markets, they are described as a major enhancement for south-east Europe’s relatively limited but strategically important gas markets.
Krk’s LNG terminal provides direct access to international LNG cargoes, while Croatia’s expanding transmission network connects those supplies with central European demand areas. Hungary remains one of Croatia’s key export markets as it diversifies away from Russian gas imports and strengthens alternative supply routes. Bosnia and Herzegovina is also identified as an important destination, with continued reliance on politically sensitive import arrangements.
Regional connectivity strategy versus neighbouring corridor plans
Croatia’s approach differs from developments in other parts of the region. Greece is developing a south-to-north LNG gateway through the Vertical Gas Corridor, while Romania is positioning itself as a regional gas producer through offshore Black Sea developments. Croatia is instead focusing on becoming a regional transit and flexibility hub by combining LNG import expansion with pipeline infrastructure.
Zagreb’s stated aim is to create multiple supply options for neighbouring markets using expanded LNG capacity and enhanced transmission links. This configuration is intended to support different supply routes for regional flows during periods of supply tightness. It also aligns with the broader investment programme associated with the Zabok–Lučko main gas pipeline.
Commercial impacts across trading, transmission and storage
The changes are expected to affect multiple parts of the gas value chain, including gas traders, transmission system operators, storage companies and infrastructure investors. Improved regional connectivity and market flexibility are cited as potential benefits across these segments. Expanded interconnections are also described as enabling optimisation of price differentials between LNG imports, Hungarian market prices and demand across south-east Europe.
Governments are noted as benefiting from greater resilience against disruptions affecting individual supply routes. The expansion also reflects ongoing investment interest in midstream gas infrastructure where projects support supply diversification, regional integration and European Union funding priorities.
Regional competition for LNG-linked demand
LNG imports routed via Greece, expanding energy corridors via Türkiye, additional supplies from Azerbaijan and future offshore production from Romania’s Black Sea fields are expected to compete for the same regional customer base. Croatia’s long-term performance is described as depending not only on infrastructure capacity but also on competitive tariffs, commercial flexibility and cross-border operations efficiency.
As south-east Europe’s gas market becomes more interconnected, Croatia is described as moving from a peripheral transit role toward a more significant position in regional gas security.
