Hydrogen long-haul: Mercedes GenH2 hits 10,000 km in Alpine heat

Fuel Cell Trucks Face Real Heat

Daimler Truck returned to the Swiss Alps this summer with four Mercedes-Benz GenH2 Truck prototypes. The company tested how its hydrogen fuel cell trucks performed under heat, altitude, and real-world load demands. The trials followed winter testing in Sweden and pushed the vehicles into new extremes.

The routes in Valais ranged from 600 to 2,478 meters in elevation. Temperatures topped 95°F (35°C). Thin mountain air added stress on the fuel cell system. The objective was to prove reliability under these punishing conditions and capture data for the next development phase.

What Daimler Tested

The focus went beyond durability. Engineers tracked:

• Driving behavior during steep climbs.
• Electric drivetrain performance under heavy load.
• Thermal management of batteries and fuel cells in extreme heat.
• System interaction between fuel cell, battery, and hydrogen tanks.
• Efficiency of Predictive Powertrain Control (PPC) software.

The PPC software uses geobased route data to detect climbs miles ahead. It adjusts the fuel cell output before the truck reaches the slope. This keeps the high-voltage battery charged and ensures enough power for efficient ascents.

Real-World Metrics

Over several weeks, the four fuel cell trucks achieved:

• 10,000 kilometers (6,214 miles) of testing.
• 146,000 meters (479,000 feet) of elevation gain.

Refueling took place via liquid hydrogen from a mobile Air Products station using the sLH2 standard. Refueling times were competitive with diesel.

The test confirmed stable drivetrain output even during extended climbs and prolonged high temperatures.

Next Development Steps

The prototypes are approaching maturity. Daimler will build a small fleet of 100 trucks in 2026 at its Woerth plant in Germany. These trucks will run in daily customer operations. The objective is to test real-world logistics conditions before scaling up.

Mass production is scheduled for the early 2030s. The initial rollout will target Europe, focusing on heavy-duty long-haul freight where batteries face range and payload challenges.

Why Hydrogen Trucks Matter

The move toward CO2-neutral transport requires alternatives to diesel. Battery-electric trucks are effective for city delivery and medium duty. But for long-haul freight, fuel cell trucks hold advantages:

1. Longer range compared to heavy battery packs.
2. Higher payload capacity thanks to lighter hydrogen tanks.
3. Fast refueling, competitive with diesel, when using liquid hydrogen.

For Daimler, hydrogen fuel cells represent one part of a dual strategy alongside battery-electric trucks.

Competitive Context

The Mercedes-Benz GenH2 Truck faces competition across the hydrogen segment:

• Volvo Trucks is developing fuel cells in partnership with Daimler.
• Hyundai operates its XCIENT Fuel Cell trucks in Switzerland.
• Toyota and Kenworth have tested fuel cell trucks in U.S. ports.

The Alpine test results are significant because they prove progress toward real-world readiness. Buyers in the heavy freight market prioritize durability, range, and total cost of ownership. Daimler is demonstrating movement in that direction.

Economic Factors

Hydrogen costs remain high. Prices often exceed $10 per kilogram in Europe and the U.S. A long-haul truck requires 60–80 kilograms per fill. That equals $600–$800 per refueling.

Diesel is still cheaper per mile today. Daimler is betting on scaling, infrastructure growth, and government incentives to close the cost gap.