Traders Lock In Ukraine Gas Route

Greece, Bulgaria, Romania and Moldova have put together a working pipeline route that can move liquefied natural gas north to Ukraine. Traders are now reserving space along it. That tells us the system can work. It does not yet prove that gas will actually reach Ukrainian storage in time for winter.

Booked pipes, missing contracts

The route starts with LNG arriving at Greek terminals. From there it enters the network run by DESFA, Greece's gas grid operator, crosses into Bulgaria, moves through Romania and reaches Ukraine through Moldova (European Commission). For Maltese readers used to thinking of energy security as a question of terminals, interconnectors and price exposure, the lesson is familiar: infrastructure only matters when the commercial terms line up.

Each country on the route controls its own grid, tariffs and regulator. The European Commission's CESEC platform, a regional energy forum for central and south-eastern Europe, has helped coordinate the project. But Brussels is not buying the gas, setting every border charge or forcing traders to ship molecules north.

The strongest evidence comes from the Greek-Bulgarian border at Sidirokastro. Traders have booked 46% of available export capacity for gas years 2026/27 through 2029/30, with some reservations running as far as 2040/41 (Logos Press, Euro2day). Multi-year cross-border capacity is not usually bought for show. On the supply side, DESFA handled 18.61 TWh of LNG in the first half of 2026, while the Alexandroupolis terminal more than tripled volumes compared with the previous year (Powergame).

But the public evidence stops before Ukraine. Capacity bookings show that traders want the right to move gas north if the economics work. According to Model Diplomat, there is still no public record of who has contracted Ukraine-bound cargoes, at what price, or on which days the gas will flow. Romania's Transgaz reports 1.5 bcm/year of bidirectional capacity with Bulgaria, but there is no comparable public figure for the Moldovan or Ukrainian exit (BVB/Transgaz).

Winter economics still favour the Russian-linked route

The timing is tight. Bulgaria's own capacity expansions at its Greek and Romanian borders are due in late 2026, which means this winter depends on existing pipes rather than the planned upgrade (Economic.bg). The wider corridor expansion, from roughly 5 to 9.4 bcm/year, is still a financing commitment, not capacity that shippers can use today (Jurnalul).

The more awkward constraint is cost. The route became commercially plausible only after operators bundled several border crossings into single booking products with discounted tariffs. That lets a trader reserve Greek-to-Romanian capacity in one transaction, instead of paying separate charges at each border (Economica). If discounts disappear at any point, traders may keep the reservations but decide not to ship.

Bulgaria already offers the warning. Bulgargaz used only around 23% of its contracted Turkish-route capacity in 2025, while carrying heavy costs for the unused part (Novinite). Paying for pipeline space you do not fill is not diversification. It is an expensive insurance policy.

The corridor's LNG also has to compete with TurkStream, which carries Russian gas through Turkey into south-east Europe. That route avoids the liquefaction and regasification costs built into LNG. The Vertical Corridor wins only when buyers are willing to pay extra for diversification. Greece, Bulgaria and Romania each gain something different from that choice: hub status, transit fees and future leverage once Romania's Neptun Deep gas field starts producing around 2027 (Economica). Hungary and Slovakia, outside the physical route, are using winter energy anxiety to seek concessions on sanctions and supply, which shows that cheaper Russian-linked alternatives still shape the politics (Topky).

Ukraine has gained an option, not a guarantee. The route exists, traders have reserved space and governments have put their names behind it. What is still missing is proof of delivery: named contracts, daily flow nominations and delivered prices. Until shippers and buyers speak as clearly as governments, the Vertical Gas Corridor can carry gas to Ukraine, but it has not yet shown that it will.