Gas grid operators from Greece, Bulgaria, Romania, Moldova and Ukraine have agreed a new tariff structure with the European Commission for the Vertical Gas Corridor, in a move intended to improve the route’s competitiveness and support supply security in south-eastern and central Europe.
The European Commission and gas transmission operators from five countries have agreed a new tariff structure for the Vertical Gas Corridor, a route designed to move gas from Greece northwards towards Ukraine and other markets in south-eastern and central Europe. Reuters reported the agreement on Friday, citing a statement by Greek gas grid operator DESFA.
According to Reuters, the operators involved are from Bulgaria, Greece, Romania, Moldova and Ukraine. The agreed tariffs are to take effect from October 2026 and are intended to make the corridor more competitive while supporting broader efforts to diversify supply away from Russian sources.
The Vertical Gas Corridor is not a new political slogan but a long-running infrastructure concept that has gained greater urgency since Russia’s full-scale invasion of Ukraine and the subsequent remapping of European gas flows. Reuters notes that Greece, Bulgaria, Romania and Hungary agreed in 2016 to develop the infrastructure needed for the corridor, with Ukraine and Moldova joining in 2024.
The immediate significance of the 27 March agreement lies less in new construction than in the commercial framework governing how the route is used. The operators and the Commission agreed tariffs aligned with EU rules, and the new regime for the first time, includes daily, monthly, quarterly and annual capacity products from the 2026–2027 gas year.
That matters because infrastructure alone does not guarantee meaningful flows. Transit pricing, product design and regulatory coordination often determine whether shippers actually use a route. In this case, the stated aim is to make the corridor a more attractive option for moving gas from Greece towards Ukraine, while also reinforcing supply resilience across neighbouring markets. Reuters quoted DESFA as describing the corridor as a “highly competitive” and “strategic energy artery” for the region.
The transitional arrangements are also important. Until the new products are fully in place, the operators will ask their national regulators to extend existing products until October 2026 in order to support Ukraine’s security of supply during the changeover. That gives the story an immediate policy relevance beyond tariff mechanics.
For Brussels, the agreement fits a broader energy-security strategy that has combined diversification, interconnection and the gradual legal and commercial closure of the EU market to Russian fossil fuels. EU Today has already covered the bloc’s effort to phase out Russian gas and oil imports, as well as moves by countries such as Bulgaria to reposition themselves as transit states for alternative supply routes. Those earlier developments provide a useful frame for today’s decision.
It also sits within a wider shift in regional supply geography. EU Today reported in January that Azerbaijan had begun deliveries to Germany and Austria, underlining how south-eastern corridors and interconnectors are becoming more important to the Union’s broader energy map. The latest tariff deal does not by itself transform volumes, but it reduces one practical barrier to using an existing route more effectively.
Azerbaijan starts gas deliveries to Germany and Austria via Trans Adriatic Pipeline
For Ukraine, the corridor matters as part of a wider effort to secure supply options in wartime conditions and ahead of future winter seasons. EU Today’s earlier reporting has already pointed to the importance of south-north routes via Greece and the Balkans in helping balance supply risks created by attacks on Ukraine’s energy system. Friday’s agreement adds a fresh commercial layer to that strategic requirement.
The story is therefore not simply about pipeline tariffs. It is about whether the EU and neighbouring operators can turn existing infrastructure into a more workable regional system at a time when energy security remains inseparable from the war in Ukraine and from Europe’s longer-term effort to reduce vulnerability to Russian supply pressure. The October 2026 implementation date means the market effect will come later, but the political signal from Brussels and the participating operators has been sent now.
