The StackPack fuel cell module from OPmobility SE - compact hydrogen power for buses

Reviewed: ad hoc news Classics & Longseller desk. Edited and checked on 2026-06-28, 04:00. Details in the imprint.

The StackPack fuel cell module from OPmobility SE sits behind the rear axle, humming quietly while a city bus pulls away without diesel vibration or exhaust smell. You feel only a smooth shove and hear mostly tire noise and a faint compressor whir.

How StackPack is built

StackPack is OPmobility's pre-integrated fuel cell module that packages the stack, cooling, and air management hardware in a single enclosure for bus and truck makers. It is designed to bolt into an existing chassis with minimal rework.

Each StackPack module houses a high-power proton-exchange membrane fuel cell stack, auxiliaries, and control electronics so OEMs treat it almost like a conventional engine block, but with hydrogen instead of diesel. The enclosure is compact and designed for underfloor or rear placement.

The power and range promise

OPmobility positions StackPack for heavy-duty applications like intercity buses and regional trucks that need hundreds of kilometers of range without long charging stops. A typical installation combines one or more modules with hydrogen tanks to deliver electric drive over full duty cycles.

In practical terms, a bus using StackPack can refuel hydrogen in around 10 to 20 minutes and then run several hours on electric traction, targeting a use case similar to diesel but with zero tailpipe emissions and lower perceived noise inside the cabin.

What operators experience

Bus operators care less about electrochemistry and more about uptime and predictable costs. StackPack is delivered as a module with standardized interfaces for hydrogen, cooling water, electricity, and communication, aiming to simplify integration and servicing.

From the driver's seat, the experience is closer to a battery-electric bus: instant torque, quiet acceleration, and no shifting. What changes with StackPack is that hydrogen refueling replaces long overnight charging, which can fit existing depot habits in regional fleets.

Design choices by OPmobility

CEO Laurent Burelle has pushed OPmobility to diversify from its traditional plastic fuel tanks into hydrogen storage and fuel cell systems over the last decade, betting that heavy-duty transport will need both batteries and hydrogen solutions.

Product teams under hydrogen division leaders have focused StackPack on modularity so OEM customers can adopt fuel cells without redesigning their whole platform, reusing electric drive components and simply swapping the power unit.

Strengths and pain points

The big strength of StackPack is its ready-to-install nature: OEMs receive a validated power module instead of sourcing individual fuel cell stacks, compressors, and cooling hardware, which reduces engineering lead time and supplier complexity.

Pain points remain typical for hydrogen mobility: the module still depends on reliable hydrogen supply, station infrastructure, and competitive fuel prices. Without enough hydrogen stations on key corridors, a StackPack bus will struggle to run flexible intercity routes.

Hydrogen ecosystem and partners

OPmobility has been active in European hydrogen consortia, positioning StackPack alongside its hydrogen storage tanks and high-pressure systems so it can offer both the energy source and the power conversion hardware to OEM customers.

In several pilot projects, StackPack-based buses run with tanks mounted on the roof or integrated in the rear, giving operators a package where storage and conversion are engineered to work together within established safety standards and certification regimes.

Where StackPack fits in the market

StackPack addresses a specific gap between pure battery buses, which excel on shorter urban routes, and long-haul diesel coaches. Hydrogen fuel cells can sustain higher continuous power output with faster refueling than large battery packs.

For regions with cold winters or mountainous terrain, StackPack's fuel cell power can feed both traction motors and onboard heating without the same range loss that battery-only buses face when energy demand spikes.

Competition and alternative options

OPmobility is not alone in hydrogen heavy-duty solutions. Fuel cell specialist Ballard and several Asian OEMs also supply stacks and systems for buses and trucks, giving fleet buyers multiple technology paths.

OPmobility's angle with StackPack is closer to a systems integrator: instead of just selling stacks, it sells a module plus tanks to fit into an OEM architecture, trying to secure longer-term platform positions rather than spot component deals.

Stock context and trading

OPmobility SE, still widely known under the Plastic Omnium name, lists its shares in Paris. The price of OPmobility shares on Euronext Paris is a reflection of how investors rate its shift from conventional fuel systems toward hydrogen and other clean mobility technologies.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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