The European Commission has opened proceedings against 26 EU member states over their failure to transpose the hydrogen pipeline regulation into national law, gasworld reports.

The regulation in question governs the development and operation of hydrogen pipeline infrastructure across the bloc. Member states were required to incorporate its provisions into national legal frameworks by an EU deadline, which the overwhelming majority missed.

Twenty-six of the 27 member states now face formal EU action. The Commission's infringement procedure begins with a formal notice letter, giving each government a set response period — typically two months — to communicate its transposition measures. Governments that fail to respond, or whose responses the Commission finds inadequate, advance to a reasoned opinion, the second stage of the process. From there, the Commission can refer a member state to the Court of Justice of the European Union, which can impose financial penalties.

The scale of the enforcement move is notable. Rather than targeting a handful of laggards, the Commission has opened the procedure against nearly the entire membership — an indication that transposition of the hydrogen network rules has slipped bloc-wide, not just in isolated jurisdictions.

For the hydrogen transport segment, the delay has direct operational consequences. The regulation sets the legal basis for how hydrogen pipelines connect to the wider EU energy network, including rules intended to govern access, tariffs and the interface between dedicated hydrogen infrastructure and the existing gas grid. Without national transposition, project developers and network operators lack the domestic legal certainty needed to finalize investment decisions on pipeline routes, compressor stations and conversion of repurposed gas infrastructure.

The Commission has made hydrogen infrastructure central to its decarbonization and REPowerEU objectives, which target substantial domestic renewable and low-carbon hydrogen production and import capacity by 2030. Transport links — pipelines chief among them — are the binding constraint between announced electrolyser capacity and offtake by industrial users in steel, chemicals and refining.

Infringement actions of this kind follow a fixed sequence, and the timelines are public. Each of the 26 governments now faces a response window. Those that transmit compliant transposition measures can close their files. Those that do not move to the next procedural stage, with referral to the Court of Justice as the ultimate sanction.

The milestone to watch is the response deadline. Whether member states complete transposition within the notice period — or force the Commission to issue reasoned opinions — will determine whether hydrogen pipeline projects across the bloc gain their domestic legal footing this year or slip further behind the 2030 infrastructure schedule.