Green hydrogen vs battery-electric for heavy transport

Two technologies, two different questions

It helps to start by naming what each technology is good at, because the public debate often pits them against each other as if one must replace the other across every duty. In practice they answer different questions.

Battery-electric trucks store energy directly as electricity in a battery pack and drive an electric motor. Green hydrogen fuel-cell trucks carry hydrogen in tanks, convert it back to electricity in a fuel cell on board, and drive the same kind of motor. Both are zero-tailpipe; both can be genuinely clean only if the energy behind them is clean — green hydrogen made with renewable electricity, batteries charged from renewable power.

The right way to choose is to put a real duty cycle on the table — payload, distance between refuels, terrain, how long the vehicle can stand still, and where it operates — and ask which technology serves it without forcing an unreasonable compromise.

Energy density: where hydrogen leads

Energy density is the first place the two diverge. Hydrogen carries far more usable energy per kilogramme than a battery does, so a hydrogen truck can store the energy for a long haul without the weight penalty a very large battery would impose.

For the heaviest classes, this matters twice over. A battery sized for a very long, very heavy duty adds mass that eats into payload, and payload is what a fleet is paid to carry. Hydrogen keeps more of the gross vehicle weight available for freight on those extreme duties.

For most freight, though, the density gap is not decisive. A battery pack matched to a corridor with planned charging stops carries enough energy for the run while keeping payload competitive. The penalty only becomes punishing at the long, heavy, remote end of the spectrum — which is exactly the duty where hydrogen earns its place.

Refuelling and recharging time

Turnaround is where hydrogen has a clear, intuitive advantage: refuelling a hydrogen truck is closer to refuelling a diesel one — minutes, not a planned stop.

Battery recharging time depends heavily on the cell chemistry and the charger. This is the single biggest reason chemistry choice decides whether a hard duty is viable for battery-electric at all. A power-optimised chemistry like Japanese LTO charges to about 80% of capacity in roughly 6 minutes and accepts very high charging power, which turns a recharge into a short pause rather than a lost shift.

On the charger side, CCS2 fast charging already scales from 240 / 360 kW for light classes up to 800 kW / 1.6 MW for heavy trucks and buses, with dual-gun megawatt stations built for corridor stops. With the right chemistry and the right charger, the practical gap between refuelling and recharging narrows sharply for corridor and depot operations — though hydrogen still leads where there is simply no time or space to pause.

• Hydrogen: refuelling in minutes, diesel-like turnaround, no dwell-time planning.
• Battery (Japanese LTO): about 80% charge in roughly 6 minutes at high power, but needs a charger present.
• CCS2 charging spans 240 / 360 kW for light duty up to 800 kW / 1.6 MW for heavy duty.
• Opportunity and megawatt corridor charging can extend range across a route without a long stop.

Infrastructure maturity

Today, the charging side is the more mature of the two. High-power CCS2 charging is a known standard, the hardware is in production across the full power ladder — 360 kW, 800 kW and 1.6 MW — and corridor and depot deployments are operating now. A fleet can plan a battery-electric corridor against infrastructure that already exists or can be built with proven equipment.

Bulk green-hydrogen production, distribution and high-throughput refuelling for road freight is still building out. The case for hydrogen is strongest where a single large, predictable, heavy-duty load justifies dedicated production and storage close to where the fuel is used — rather than relying on a broad public refuelling network that is not yet in place.

This is why infrastructure maturity should be assessed route by route, not in the abstract. A dense freight corridor with charging hubs is a different proposition from a remote mine or a long intercity haul with no charging between endpoints.

Round-trip efficiency and cost

On energy efficiency from source to wheels, battery-electric has a structural advantage that does not go away. Charging a battery and discharging it to a motor loses relatively little energy along the way. Green hydrogen takes a longer path: electricity makes hydrogen by electrolysis, the hydrogen is compressed and stored, and a fuel cell converts it back to electricity on board. Each step loses energy, so substantially more renewable electricity is needed to move a hydrogen truck the same distance as a battery-electric one.

For a fleet, that efficiency gap usually shows up as running cost. Cost has to be read over a vehicle's life, not at the sticker, and three lines move it: the asset, the energy and the upkeep. Battery-electric generally carries lower fuel cost per kilometre because of its efficiency advantage, and a long-life chemistry reduces the battery-replacement burden — Japanese LTO is rated at 20,000+ cycles with capacity at or above 70% after 20,000 charge and discharge cycles, which spreads the pack cost across far more kilometres.

Hydrogen's economics improve where energy density and fast refuelling unlock duties a battery cannot serve, where high utilisation justifies dedicated refuelling, or where the payload preserved by a lighter energy store is worth more than the efficiency lost. The honest comparison is per-duty, not blanket: for most freight today, battery-electric is the lower-cost path; for the heaviest and longest duties, hydrogen can be the only path that works. Whichever fits, a per-kilometre service model can hold the energy price and the maintenance risk inside one contract, so the cost line stays predictable across a quarter rather than moving under the operator.

Which duty suits which technology

The clearest way to choose is by duty. The table below maps common heavy-transport patterns to the technology that tends to fit, on the measures above.

As a rule of thumb: corridor and depot-based freight with predictable routes and time to charge favours battery-electric; the heaviest, longest and most remote duties — where there is no time to pause, no charging between endpoints, or payload is paramount — favour green hydrogen.

Where Ampinity stands

Ampinity builds both sides of this, and treats them as complementary rather than competing. The position is straightforward: green hydrogen fits the heaviest and longest duties — the hauls and the heat that electrification cannot reach — while battery-electric covers most freight running today.

On the battery side, the trucks run on Japanese LTO with CCS2 charging up to 800 kW / 1.6 MW, sized to real payloads and gradients across four GVW classes from 10 to 55 tonnes. The chemistry's fast charging, long cycle life and −30 °C operation are what make fast corridor and opportunity charging a practical answer for heavy freight, not a compromise.

On the energy side, green hydrogen is approached as production and storage engineered for real industrial demand — the buyer whose load runs past where electrification reaches. It sits alongside the other clean-energy lines, including compressed bio-gas (CBG) made from agricultural residue, each sized to a load the company already carries.

The two are offered as one system rather than a choice the customer has to assemble. Battery-electric trucks come with eTaaS, where the truck, its energy, corridor charging and servicing arrive as a single per-kilometre rate; green hydrogen is offered as production and storage for the heavy-duty loads a battery cannot reach. A fleet can bring a duty cycle and be matched to whichever path fits.