Southeast Europe’s gas market is developing competing northbound supply corridors from the Adriatic and Aegean seas, expanding the region’s access to liquefied natural gas and gradually reshaping the commercial role of traditional pipeline routes.
Croatia’s Krk LNG terminal received its first cargo from Norway’s Hammerfest LNG facility in August, adding another source of supply to a terminal that already handles cargoes from a diverse range of global producers. The cargo arrived at Omišalj aboard the Minerva Limnos after loading at the Equinor-operated Hammerfest facility.
Krk was initially developed primarily as a diversification asset for Croatia and neighbouring markets. Its strategic importance, however, is increasingly determined by how much regasified LNG can move beyond the Croatian market and reach Hungary and other Central European buyers.
Croatian and Hungarian transmission system operators have been working to expand capacity along the northbound route, potentially allowing additional Krk LNG volumes to compete with gas entering Central and Southeast Europe through alternative corridors.
At the same time, a competing supply route is gaining importance farther south.
Bulgaria’s state gas supplier Bulgargaz announced on August 26 that it would offer regional customers an integrated LNG service from the 2026/27 gas year, covering procurement, terminal access, regasification, storage, transmission and delivery to an agreed cross-border point.
Under the proposed model, customers could either purchase LNG directly through Bulgargaz or provide their own cargo while using the Bulgarian company for the downstream logistics chain. The structure builds on Bulgaria’s access to Greek LNG infrastructure, including the Alexandroupolis terminal, as well as storage at Chiren and pipeline connections with Greece, Romania, Serbia and Turkey.
This is creating a developing commercial contest between gas entering Europe through the Adriatic and supplies arriving through the Aegean and eastern Mediterranean systems.
Serbia is increasingly positioned between these emerging corridors. The country already has access to Bulgarian gas through the Serbia-Bulgaria interconnector, while a planned Serbia-North Macedonia connection could provide an additional southern route toward the Greek gas system. According to Serbia’s Energy Ministry, the proposed pipeline would extend for around 70 km on the Serbian side and have annual capacity of approximately 1.2 billion cubic metres.
For regional buyers, the value of diversification is becoming increasingly commercial rather than purely geopolitical. The relevant calculation now depends on the full delivered cost of gas, including the LNG cargo price, regasification charges, pipeline tariffs, storage costs, available transmission capacity and the price at the destination hub.
As a result, a cargo arriving at Krk could be the most competitive option for one Central European buyer, while an LNG cargo delivered through Alexandroupolis could offer better economics for customers in Bulgaria, Serbia or North Macedonia.
Those economics can change rapidly as congestion levels, transmission constraints and hub price spreads shift across the region.
The competition between supply corridors is becoming even more significant as Europe approaches winter with gas storage levels below those of the previous year. Gas Infrastructure Europe data showed EU storage facilities at 65.44% full on August 31, compared with around 78% a year earlier. Germany’s storage was only 53.32% full, although Italy, Croatia, Hungary and Romania were in comparatively stronger positions.
A tighter European gas market increases the commercial and strategic value of maintaining multiple import routes. When supply conditions become constrained, access to alternative LNG terminals and cross-border infrastructure can provide buyers with greater flexibility and reduce dependence on any single corridor.
The strategic transformation underway in Southeast Europe is therefore not simply about replacing one dominant pipeline route with another. Instead, the region is developing a more interconnected gas network in which Krk, Alexandroupolis, TAP-linked supplies, Bulgarian infrastructure, Turkish routes and regional storage facilities increasingly compete and complement one another.
For traders and utilities, that network creates greater supply optionality. For national markets, it strengthens security of supply and improves access to alternative sources.
At the same time, the growing number of routes means that pipeline capacity, transmission tariffs and cross-border congestion will play a larger role in determining which LNG terminal ultimately sets the marginal gas price across the Balkans. As these corridors expand, Southeast Europe is moving from a market defined primarily by pipeline dependence toward one increasingly shaped by competition between multiple LNG entry points and flexible regional flows.
