Ukraine's Gas TSO Revises Network Rules to Preserve EU Imports from October
Ukraine's gas TSO amended its network code to keep EU reverse flows viable from October, with winter import costs and high TTF prices as the key variables.
Ukraine's gas transmission system operator amended its network code on Tuesday (2026-07-21) to preserve the country's ability to import gas from the European Union from October, Montel reported. The revision comes as Ukraine heads into winter having lost Russian transit revenues and facing volatile import costs from its western neighbours.7
ICE Endex TTF front-month gas held at €61.90/MWh on Friday (2026-07-24). That price had already suppressed Ukrainian import appetite sharply once this year. ExPro data showed Ukraine's daily imports collapsed from 24 million cubic metres on Tuesday (2026-05-19) to just 0.8mcm, the lowest in more than a year, as high European spot prices made commercial purchases unviable.1
The October deadline ties directly to the start of Ukraine's heating season, when domestic demand rises and any storage deficit becomes acute. Ukraine's transit of Russian gas to European customers was halted on Wednesday (2026-05-13), after a prewar transit agreement expired, severing one of the routes that had kept central European gas balances tighter than they would otherwise have been.2
Before the war, Russia supplied nearly 40% of the EU's pipeline gas. That share had already fallen to roughly 8% by 2023, according to EU Commission data, as buyers rerouted toward Norwegian and LNG sources. Ukraine's halt of Russian transit accelerated that shift, but the infrastructure that once carried eastbound Russian supply can, in reverse, carry European gas westward into Ukraine.2
Preserving that reverse-flow option is what the TSO rule change appears to address. A 10% annual cut in Romanian gas transportation tariffs, effective from the 2026-27 gas year, was identified by market participants as a mechanism to stimulate flows along the Trans-Balkan pipeline into Ukraine, Montel reported in the week of June 8 (2026-06-08). If the regulatory amendments work alongside that tariff reduction, import volumes could recover meaningfully from the near-zero lows recorded in May 2026.5
But the EU's own exposure to Russian gas has moved in the opposite direction even as Ukraine tries to lock in western supply. The bloc imported a record 9.97 million metric tonnes of LNG from Russia's Yamal facility in the first half of 2026, worth approximately €5.96 billion, a 16% rise year-on-year, according to OilPrice.com. Kpler data showed European buyers absorbed more than 97% of the Siberian terminal's total output over the period, and overall EU Russian LNG imports were up 11% year-on-year through June, with pipeline gas from Russia up 7% over the same period.6
That dependency sits uncomfortably alongside EU plans to ban Russian LNG imports by 2027, and it shapes how TTF prices — the primary cost variable for any Ukrainian import from the west — behave through the injection season. A TTF curve sustained above €60/MWh makes Ukrainian commercial imports expensive and could test whether the revised rules generate actual contracts or simply a legal framework that market prices continue to undercut.6
The Bruegel Institute estimated that the end of Russian transit through Ukraine would cost Moscow around $6.5 billion annually in lost export revenue, unless those flows find alternative pipelines or LNG terminals. The EU separately explored routing Azerbaijani gas through Russian pipelines crossing Ukrainian territory, Bloomberg reported in May 2026, as one option to keep the corridor commercially active without direct Russian benefit.4,3
Ukraine's ability to draw EU gas in October hinges on TTF staying within a range where commercial reverse flows remain viable. At €61.90/MWh on Friday (2026-07-24), TTF is already near the price at which Ukrainian imports collapsed in May (2026-05-19). Any sustained move higher through August would put October import capacity under pressure before the heating season has formally begun.7,1