While the world obsesses over battery electric vehicles and hydrogen fuel cells, a quieter revolution is taking place in the engine rooms of heavy trucks, construction sites, and mining operations. Hydrogen internal combustion engines (H2-ICE) are emerging as a practical, cost-effective bridge to zero-emission transport — without requiring a complete overhaul of existing manufacturing infrastructure.
The market nobody is talking about
The global hydrogen combustion engine market is projected to grow from $1.7 billion in 2026 to $20.8 billion by 2036, at a compound annual growth rate of 28.5%, according to Future Market Insights. What makes this figure particularly striking is the European angle: the continent is expected to register a CAGR of 50.1%, making it the fastest-growing region for the technology.
Commercial vehicles account for 57% of the market, and transportation applications represent 65% of demand. Direct injection systems dominate with a 60% technology share. These numbers tell a clear story: heavy logistics needs a decarbonisation solution that works like diesel, and hydrogen combustion fits the bill.
Why hydrogen combustion, not fuel cells
The public narrative around hydrogen has been overwhelmingly focused on fuel cells. But hydrogen combustion engines offer several structural advantages:
+ Manufacturing continuity. Existing engine production lines can be adapted rather than replaced. For manufacturers with decades of investment in ICE tooling, this dramatically lowers the barrier to entry.
+ Operational familiarity. Fleet operators understand combustion engines. Maintenance cycles, repair procedures, and driver experience remain largely unchanged.
+ Payload and range. For heavy-duty applications — trucks carrying 40 tonnes, mining haulers, construction equipment — battery weight and charging downtime are dealbreakers. Hydrogen combustion preserves the operating profile that industry depends on.
+ Fuel flexibility. Dual-fuel configurations allow operators to run on diesel, hydrogen, or a blend, providing a migration path rather than a hard cutover.
Who is moving on H2-ICE
Several major OEMs are already active:
+ JCB has developed a hydrogen combustion engine for construction equipment and is actively testing in UK quarry operations.
+ Toyota continues to develop hydrogen combustion prototypes, including a GR Yaris H2 concept, demonstrating the technology’s performance potential.
+ Cummins is investing in hydrogen-capable engine platforms for the North American trucking market.
+ MAN Truck & Bus and Volvo are running pilots for hydrogen combustion in heavy trucks under European funding programmes.
The Institution of Mechanical Engineers (IMechE) is hosting its dedicated H2-ICE conference in Warwick, UK, in 2026, reflecting the growing technical community around the technology.
The European advantage
Europe’s industrial base gives it a natural lead in hydrogen combustion adoption. The continent has:
+ A dense network of heavy trucking and logistics operators
+ Established combustion engine supply chains
+ Stringent CO2 reduction targets that incentivise practical solutions over aspirational ones
+ Existing hydrogen production and distribution projects (particularly in Germany, the Netherlands, and Scandinavia)
While battery electric vehicles dominate the passenger car narrative, the heavy transport sector — responsible for a disproportionate share of transport emissions — has no credible all-electric solution for long-haul, high-payload operations. Hydrogen combustion fills this gap.
Challenges ahead
The technology is not without hurdles. Hydrogen combustion produces NOx emissions, requiring aftertreatment systems. Hydrogen storage on vehicles remains bulky compared to diesel. And the hydrogen refuelling network is still in its infancy.
But these are engineering problems, not fundamental barriers. The engine technology itself is proven. The supply chains exist. What’s needed is infrastructure investment and regulatory support — both of which are accelerating.
The bottom line
Hydrogen combustion engines won’t replace electric passenger cars. They don’t need to. Their market is heavy transport, construction, mining, and off-highway applications — sectors that represent a $20 billion opportunity by 2036.
In the noise around battery factories and fuel cell stacks, hydrogen combustion is the sleeper technology that could decarbonise the hardest-to-abate sectors of transport. Europe, with its industrial heritage and regulatory tailwinds, is best positioned to lead.
Sources: Future Market Insights, MarketsandMarkets, IMechE H2-ICE Conference 2026, S&P Global Automotive Insights.
