MOL finishes reconstruction of fire-damaged AV3 distillation unit at Hungary’s Danube Refinery, with production restart planned for October
MOL wrapped up all construction work on the fire-damaged AV3 crude oil distillation unit at its Danube Refinery in Százhalombatta, Hungary — on schedule and within an 18 billion forint (around $50 million) repair budget. The unit took serious damage in an October 2025 fire, kicking off a year-long restoration that meant rebuilding reinforced concrete structures and replacing critical equipment throughout the facility.
Construction work completed on schedule
Finishing the AV3 rebuild on time is a big deal for MOL and its Danube Refinery. The company confirmed the project landed exactly where the preliminary schedule said it would — which isn’t easy when the damage was this extensive. With the $50 million spent, attention now shifts from rebuilding to getting back online.
Clearing construction equipment from the site comes first. Once that’s done, the gradual restart process can begin — moving through commissioning and testing before the refinery reaches full-capacity operation again. MOL hasn’t rushed any phase. Each step follows a set sequence designed to confirm everything works before crude oil starts flowing.
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October 2025 fire triggered a comprehensive restoration effort
The October 2025 fire didn’t just damage equipment — it caused structural damage serious enough to require demolishing and fully rebuilding reinforced concrete sections of the AV3 unit. Starting from scratch in key parts of a working refinery is a different challenge than swapping out components.
Beyond the structural work, MOL restored process equipment, control systems, and electrical systems across the unit. The numbers tell the story: 27 new high-capacity pumps installed, 5 miles (8 km) of piping replaced, and 62 miles (100 km) of electrical cables laid throughout the facility. That’s not a patch job.
The whole effort took roughly a year. Hitting the preliminary schedule, given everything involved, points to a restoration that was well-organized and tightly run — and for a refinery this strategically important, making that deadline carries real weight.
Commissioning and testing steps precede crude oil introduction
Finishing construction is one thing. Getting a complex refinery unit safely back online is something else entirely, and AV3 has to clear a rigorous series of preparatory steps before crude oil enters the picture.
Flushing the systems and running pressure tests come first, checking integrity across the rebuilt infrastructure. Functional testing of the process control and safety equipment follows — confirming that everything controlling and protecting the unit performs exactly as it should before anything more consequential happens. Auxiliary power supplies also need to be connected, and AV3’s operations have to be coordinated with associated facilities at the Danube Refinery, since the unit is part of a larger interconnected system.
Only after all of that — and after rigorous operational safety inspections at each stage — does crude oil come into the picture. Even then, production won’t jump straight to full capacity. MOL describes the restart as gradual, with production resuming step by step in October 2026, a measured approach that reflects both the unit’s complexity and the priority placed on getting it right.
Regional energy context elevates strategic importance of the restart
The return of AV3 isn’t just a refinery story. It’s happening against a backdrop that makes reliable refining capacity more valuable than it’s been in years. Krisztián Pulay, MOL’s Senior Vice President of Group Downstream Production and Development, pointed directly to the war in Iran and a global energy crisis as factors reshaping the competitive landscape for energy supply.
“Everyone is competing for alternative sources,” Pulay said, “which increases the value of every reliable supply route and European refining capacity.” That framing puts the AV3 restart in a bigger context — not just an operational recovery, but a tangible contribution to regional energy security at a moment when that security faces genuine pressure.
While AV3 was offline, MOL leaned on diversified procurement and import options to keep fuel supply going. It worked, but it also made clear how much domestic production capacity is worth. Your own refining output means less dependence on external sources and more flexibility when markets tighten.
With AV3 back, MOL says the Danube Refinery becomes stronger and more adaptable — better positioned to meet domestic and regional demand on its own terms rather than depending on what procurement channels can deliver.
A gradual production restart planned for October
MOL has completed all construction work on the AV3 crude oil distillation unit at the Danube Refinery in Százhalombatta, Hungary — finishing on schedule and within a total repair budget of 18 billion forints (approx. $50 million). A fire in October 2025 caused serious damage to the unit, setting off a full year of restoration work that included rebuilding reinforced concrete structures, installing 27 new pumps, replacing 5 miles (8 km) of piping, and laying 62 miles (100 km) of electrical cables.
Before production resumes, AV3 has to clear flushing, pressure testing, functional checks, and operational safety inspections. Crude oil introduction and a gradual production restart are planned for October 2026. Once commissioning and testing wrap up, the Danube Refinery returns to full-capacity operation — restoring refining capacity that MOL Group says strengthens fuel supply security for Hungary and the broader region.
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