H2ICE Europe: Who Is Building Hydrogen Combustion Engines, Who Is Deploying Them, and What Comes Next

H2ICE Europe: Who Is Building Hydrogen Combustion Engines, Who Is Deploying Them, and What Comes Next

H2ICE Europe is not one market. It is three overlapping markets with different economics: new-build hydrogen combustion trucks, off-highway engines for construction and agriculture, and fleet repowering for existing diesel assets. MAN and Daimler Truck/KEYOU sit in the first. JCB is proving the second. ULEMCo and Metier are building the third. The engine problem is increasingly well understood. The commercial problem is hydrogen supply, station utilisation and policy classification.

Why H2ICE Is Back On The Serious List

Hydrogen internal combustion engines were easy to dismiss while the sector consisted mainly of prototypes, conference slides and fuel-agnostic optimism. That phase is ending. The current European H2ICE market is still small, but it now has named truck platforms, certified engines, municipal fleet conversions, component suppliers and a regulatory argument that policymakers can no longer file under interesting-but-later.

The engineering appeal is straightforward. H2ICE reuses much of the industrial base created for diesel engines: blocks, crankcases, machining lines, gearboxes, technicians, service networks and duty-cycle knowledge. It trades the electrochemical elegance of a fuel cell for ruggedness, lower system complexity and a faster route into existing vehicle architectures. That matters in heavy-duty transport, off-highway machinery and public fleets where asset life, payload, uptime and maintenance culture are not footnotes.

For the deeper technical foundation, see my earlier guide, Hydrogen Internal Combustion Engine (H2ICE): The Comprehensive 2025 Guide, published on 28 October 2025. This article does something different: it maps the live UK and European deployment landscape, the companies building it, the commercial logic behind it and the policy choices that will determine whether H2ICE becomes a useful decarbonisation tool or another stranded hydrogen enthusiasm.

That three-market framing is the useful starting point. The first market is new-build heavy trucks from OEMs and platform specialists. The second is off-highway engines for construction, agriculture, generators and non-road mobile machinery. The third is fleet repowering, where existing diesel vehicles are converted to hydrogen dual-fuel or full hydrogen operation. Treating them as one market produces bad strategy and worse spreadsheets.

The Deployment Landscape

The Daimler Truck and KEYOU agreement announced on 22 June 2026 is important because it uses familiar assets rather than a clean-sheet hydrogen vehicle. Daimler plans to sell Mercedes-Benz Actros L 1848 tractor units and Mannheim-built engines based on its existing 12.8-litre platform to KEYOU. KEYOU will adapt them for hydrogen combustion and offer the resulting KEYOU HICE.40 tractor to customers. Daimler states that the vehicle is designed for 40 tonnes gross vehicle weight, up to 350 kW, 350-bar gaseous hydrogen storage and up to 650 km of range, with market introduction from the end of 2027.

That architecture is commercially revealing. Daimler is not betting the company on a new H2ICE truck line. It is using a partnership model to make hydrogen combustion available faster, with lower programme risk and the option to use existing service structures later. KEYOU gets access to a serious truck platform. Daimler gets a hydrogen combustion offer without derailing its larger battery-electric and fuel-cell strategy. Everyone gets optionality, which is often what companies really buy when infrastructure is uncertain.

MAN is further ahead on actual small-series deployment. Its hTGX uses the H45 hydrogen combustion engine, based on the D38 diesel engine, produced at MAN’s Nuremberg engine and battery plant. MAN says the hTGX will offer up to 600 km range, 383 kW, 2,500 Nm of torque, 700-bar compressed hydrogen storage and refuelling in less than 15 minutes. The company positions it for special applications such as construction logistics, tank transport and timber haulage, particularly where bodywork, payload or infrastructure constraints make battery-electric trucks awkward.

JCB occupies a different but strategically important part of the market. The company says it has spent GBP100 million on hydrogen combustion engine development, with a team of 150 engineers and more than 130 evaluation engines powering backhoe loaders, Loadall telehandlers and generator sets. In January 2025, JCB announced that 11 licensing authorities across Europe had approved its hydrogen engine for sale and use. For construction and agricultural equipment, where machines often work long days in harsh environments and may be first on site before grid services exist, this is not a decorative niche.

ULEMCo shows how H2ICE can enter fleets before OEM replacement cycles mature. Its Aberdeen City Council contract covers an initial 35 vehicles, including refuse collection vehicles, road sweepers, tippers and tractors. ULEMCo’s H2ICED dual-fuel approach does not eliminate diesel immediately, but it creates hydrogen demand from vehicles already in the fleet and can reduce CO2 emissions while preserving operating familiarity. In hydrogen hubs, demand aggregation is not a theoretical benefit. It is the difference between a refuelling asset and an expensive monument.

Company Comparison Table

Company Ecosystem Diagram

Commercial Deployment Timeline

Technology Comparison

Market Landscape: Three H2ICE Markets, Not One

New-build trucks are the most visible part of H2ICE Europe, but probably not the first to reach broad profitability. Truck OEMs need confidence in refuelling corridors, residual values, warranty costs, hydrogen quality, maintenance schedules and customer demand. Early volumes will concentrate in special applications: high payload, return-to-base, low charging suitability, local hydrogen availability, public procurement or customers prepared to pay for decarbonisation without losing operational flexibility.

Off-highway machinery has a stronger near-term case. The UK Advanced Propulsion Centre’s H2ICE Task and Finish Group concluded in 2024 that H2ICE should be accepted as a net zero emissions technology for non-road mobile machinery. Its reasoning is practical rather than sentimental. Construction and agricultural machines often have high transient loads, long duty cycles, hostile environments, poor access to grid power and expensive downtime. A battery excavator that cannot work through the duty cycle is not low carbon in any commercially useful sense. It is a scheduling problem with a nice paint job.

Repowering is the under-discussed middle market. Full fleet replacement is capital intensive and slow. Converting existing vehicles can create hydrogen demand earlier, reduce emissions from assets that would otherwise remain diesel for years, and support local hydrogen hubs. Dual-fuel conversion is less pure than a zero-tailpipe-emission claim, but purity is not always the right metric. The commercial question is whether a conversion creates enough real emissions reduction and hydrogen demand to justify the capital cost, downtime and maintenance complexity.

Engineering Analysis

Hydrogen combustion looks simple until the details arrive. Hydrogen has high gravimetric energy density, very low ignition energy, high flame speed and a wide flammability range. Those properties make it attractive for lean combustion but also make pre-ignition, knock, NOx control and storage integration serious design work. The best H2ICE programmes are not diesel engines with optimism added. They are redesigned combustion systems with injection strategy, turbocharging, exhaust gas recirculation, aftertreatment and calibration matched to hydrogen’s behaviour.

Port fuel injection, as used in the KEYOU HICE.40 concept described by Daimler, is a practical near-term route because it is comparatively simple and compatible with lower-pressure gaseous hydrogen. High-pressure direct injection, pursued by Cespira and others, can improve efficiency and power density by reducing displacement of intake air and improving combustion control. That comes with more demanding injection hardware and integration complexity. The engineering trade-off is the familiar one: a simpler system can reach customers faster; a more advanced system may win on efficiency and total cost once volumes justify it.

NOx is the recurring objection to H2ICE. It should be taken seriously, but not lazily. Hydrogen contains no carbon, so the main combustion emissions challenge is nitrogen oxides formed at high temperature, plus small contributions from lubricating oil and aftertreatment chemistry. The APC report cites stakeholder data showing deep reductions in NOx and particulate emissions compared with Stage V diesel, and estimates CO2 reductions of 99.95% for NRMM applications. Those figures do not make H2ICE identical to a fuel cell. They do make it hard to dismiss H2ICE as merely greenwashed diesel.

Infrastructure Is The Binding Constraint

The European Commission’s Alternative Fuels Infrastructure Regulation, applicable since 13 April 2024, requires publicly accessible hydrogen refuelling stations along the TEN-T core and comprehensive networks with a maximum distance of 200 km between them, and at least one in every urban node. That is a serious policy signal. It is also a minimum geography, not a bankable business case.

Heavy-duty hydrogen stations need high throughput, reliable compression, adequate storage, fast dispensing, vehicle-compatible pressure and redundancy. A station designed for a few demonstration cars does not become a freight asset by adding a larger sign. The economics improve when anchor fleets provide predictable demand: municipal vehicles, construction logistics, port equipment, buses, regional HGVs, refuse fleets and industrial users sharing the same local hydrogen node.

This is where H2ICE can help hydrogen infrastructure as much as hydrogen infrastructure helps H2ICE. A fuel-cell truck fleet may demand high hydrogen purity and expensive vehicles. H2ICE and dual-fuel fleets can create earlier, more varied demand from assets that are cheaper or already owned. That does not solve delivered hydrogen cost. It does improve station utilisation, which is the unglamorous variable that decides whether a hydrogen hub lives.

Commercial Implications

Investment Implications

The best H2ICE investments are unlikely to be speculative vehicle brands promising to beat Daimler, MAN and Volvo at truck manufacturing. Better opportunities sit around enabling layers: hydrogen storage modules, safety systems, injectors, engine controls, conversion engineering, certification, fleet analytics, mobile refuelling, maintenance tooling and local infrastructure finance. The less glamorous the component, the more likely it is to survive first contact with procurement.

Investors should separate technology risk from adoption risk. H2ICE technology risk is falling because working engines, certified machines and truck programmes exist. Adoption risk remains high because hydrogen price, infrastructure availability, utilisation and regulation are unresolved. The investable companies will be those that can generate revenue in constrained geographies before the pan-European hydrogen network exists. Waiting for perfect infrastructure is a reliable way to miss the market and still be disappointed.

Policy Implications

The policy question is whether H2ICE should be treated as a useful low-carbon transition technology, a zero-emission technology in defined categories, or an awkward combustion legacy. The answer should depend on measured emissions, duty cycle and sector, rather than drivetrain theology. For NRMM, the APC report makes a strong case that hydrogen combustion should be recognised as a net zero emissions technology when using low-carbon hydrogen and meeting strict air-quality standards.

For road freight, the EU’s CO2 framework matters because vehicle classification affects OEM fleet targets, tolling and customer incentives. MAN explicitly links the hTGX opportunity to EU rules that can classify hydrogen combustion trucks as zero-emission vehicles when they meet the required CO2 threshold. The UK should avoid creating a policy gap where domestic H2ICE engineering capability exists but procurement and incentives remain written only for battery electric and fuel cell vehicles.

Future Outlook

H2ICE will not replace battery-electric trucks across mainstream freight. Battery-electric vehicles will take a large share of predictable, depot-based and increasingly long-haul routes where charging infrastructure and payload economics work. Fuel-cell trucks remain relevant for long-range hydrogen corridors, especially if liquid hydrogen and high-utilisation stations mature. H2ICE sits beside those pathways as a pragmatic combustion-based option for special applications, off-highway machines and local hydrogen ecosystems.

The next three years will decide whether H2ICE becomes a real market segment or a useful demonstration bridge. Watch four indicators: whether MAN’s hTGX customers reorder; whether Daimler and KEYOU reach end-2027 market launch with credible service support; whether JCB moves from evaluation engines into repeatable commercial machine sales; and whether local hydrogen hubs can sell kilograms at prices fleet operators can tolerate. Press releases are now less interesting than uptime data.

Key Takeaways

• H2ICE Europe is now an early deployment market, not only an R&D theme.
• MAN leads among European truck OEMs; Daimler/KEYOU is the most important new partnership to watch.
• JCB gives the UK a credible industrial position in off-highway hydrogen combustion.
• Fleet repowering could create earlier hydrogen demand than full OEM replacement.
• Infrastructure, hydrogen price and policy classification will decide deployment speed.
• The strongest commercial cases will be local, fleet-specific and duty-cycle-led.

• Hydrogen Internal Combustion Engine (H2ICE): The Comprehensive 2025 Guide
• Hydrogen and energy systems
• UK hydrogen infrastructure deployment
• Hydrogen vs electric trucks
• Fleet decarbonisation economics

Related Tools

• Commercial Fleet TCO Calculator
• Fleet Decarbonisation Readiness Score
• Zero-Emission Break-Even Analysis

FAQs

What does H2ICE mean?

H2ICE means hydrogen internal combustion engine. It burns hydrogen in an adapted combustion engine to produce mechanical power. The main tailpipe product is water vapour, with NOx controlled through combustion strategy and aftertreatment.

Is H2ICE better than fuel cells?

Better is the wrong unit of analysis. Fuel cells can be more efficient and better suited to some long-range electric drivetrains. H2ICE can be cheaper, more rugged and faster to integrate into existing vehicle platforms. Duty cycle, infrastructure and total cost decide.

Which European company is leading H2ICE trucks?

MAN is furthest ahead among European truck OEMs in public small-series deployment. Daimler Truck and KEYOU are the most important new partnership because they link KEYOU’s conversion technology to the Actros platform and Daimler engine supply.

Why is JCB important?

JCB gives H2ICE a strong off-highway use case. Construction and agricultural machinery have duty cycles and operating environments where battery-only solutions can be difficult, especially when machines work long days before grid infrastructure is available on site.

Will H2ICE help hydrogen infrastructure?

Potentially. H2ICE and converted fleets can create local hydrogen demand before fuel-cell truck volumes are large. That helps station utilisation, especially in municipal, industrial, port and construction clusters.

What should policymakers do?

Classify technologies by measured emissions and use case. For NRMM and special heavy-duty applications, H2ICE deserves a clear policy route when it meets strict greenhouse-gas and air-quality standards using low-carbon hydrogen.

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