Hydrogen Fuel

What is hydrogen fuel — types, production, and energy content

Hydrogen (H₂) is the lightest and most abundant element in the universe, but it does not occur freely on Earth — it must be produced by separating it from compounds like water (H₂O) or natural gas (CH₄). As a fuel, hydrogen has an energy density of approximately 33.3 kWh per kg (or 120 MJ/kg) — three times higher by mass than petrol (43.2 MJ/kg). However, hydrogen is a gas at ambient conditions and requires high-pressure compression (700 bar for vehicle fuel tanks) or cryogenic liquefaction to achieve a practical energy density by volume.

Hydrogen for transport is produced through several pathways, each with a different carbon footprint and cost. The colour coding (green, blue, grey, pink, turquoise) is an industry shorthand — not a formal standard — but widely used:

• Grey hydrogen — from natural gas via steam methane reforming (SMR) without CCS. ~10 kg CO₂ per kg H₂. Cost ~USD 1.50–2.00/kg. Currently ~95 % of global hydrogen production.
• Blue hydrogen — SMR with carbon capture and storage (CCS). ~2–3 kg CO₂/kg H₂ if capture rate is high. Cost ~USD 2.00–3.00/kg.
• Green hydrogen — electrolysis of water powered by renewable electricity. Near-zero lifecycle emissions. Cost ~USD 4–8/kg today, projected to fall to USD 1–3/kg by 2035 with electrolyser cost reduction and cheap renewable electricity.
• Pink hydrogen — electrolysis powered by nuclear electricity. Near-zero lifecycle emissions. Cost similar to green but with nuclear baseload characteristics.

The hydrogen fuel economics news article covers the cost trajectory and market development in depth. For current petrol and diesel prices to compare against, use the FuelTheGuide Explorer.

How hydrogen fuel cells work in vehicles

In a hydrogen fuel cell electric vehicle (FCEV), hydrogen stored in a high-pressure tank is fed to a fuel cell stack where it reacts electrochemically with oxygen from air. The reaction — the reverse of electrolysis — produces electricity, water, and heat. The electricity powers an electric motor; the only exhaust is water vapour.

The fuel cell stack itself contains hundreds of individual cells, each a thin layer sandwich of polymer electrolyte membrane (PEM) between anode and cathode. Hydrogen is oxidised at the anode (releasing electrons and protons), electrons flow through the external circuit generating electricity, protons migrate through the membrane, and both combine with oxygen at the cathode to form water.

FCEVs share the quiet, smooth electric motor characteristics of battery EVs but have faster refuelling (3–5 minutes to fill a hydrogen tank versus 20–40 minutes for fast-charging a BEV), longer range (600–850 km vs 300–500 km for most BEVs), and carry less weight in energy storage. The trade-off: hydrogen refuelling infrastructure is far less developed than EV charging — there are ~1,000 hydrogen stations globally versus ~2 million EV charge points.

Current hydrogen fuel cell passenger vehicles include the Toyota Mirai (FCEV, ~650 km range) and Hyundai Nexo (~600 km range). Heavy commercial vehicles — trucks and buses — are seen as the more commercially compelling near-term application, given their range requirements and tolerance for fewer but larger fuelling stations. Compare to EV running costs in our EV running costs guide.

Hydrogen fuel cost per kg vs petrol per litre — the economics

The economics of hydrogen as a transport fuel depend on comparing the retail cost per unit of usable energy delivered to the wheels. A useful comparison:

Battery EVs are currently the cheapest option per 100 km on energy cost alone — hydrogen is broadly cost-competitive with petrol at current European prices, but more expensive than diesel and significantly more expensive than home-charged electricity. The hydrogen advantage emerges in use cases where battery weight, charging time, or range are limiting factors: long-haul trucks, aviation (hydrogen-powered aircraft are in development), shipping, and industrial heat.

For a full cross-fuel running cost comparison see fuel cost per km calculator and the EV running costs guide.

Hydrogen refuelling infrastructure — current status

The hydrogen refuelling station (HRS) network is the primary barrier to mass FCEV adoption. As of 2026:

• Europe: ~450 HRS, concentrated in Germany (~120), France (~60), Netherlands (~40), UK (~20). The H2 Mobility consortium plans to expand to 1,000+ stations by 2030, prioritising corridor motorway coverage for heavy trucks.
• Japan: ~170 HRS — the densest network relative to population, reflecting Toyota and Hyundai FCEV sales volumes. Government subsidy supports station construction.
• USA: ~55 HRS, almost entirely in California under the California Air Resources Board (CARB) mandate. Outside California, hydrogen refuelling is essentially unavailable.
• China: Growing rapidly — ~300+ HRS, driven by heavy truck FCEV mandates in certain provinces and large-scale domestic electrolyser manufacturing.

The H2 Stations Map provides a live, interactive map of global hydrogen refuelling stations. Heavy-duty applications (bus fleets, port equipment, long-haul trucking) are ahead of passenger cars in commercial deployment because centralised refuelling removes the network infrastructure challenge.

What is hydrogen fuel and what does the hydrogen fuel price look like?

What is hydrogen fuel? It is the lightest element used as an energy carrier — not a primary energy source but a manufactured fuel produced from water (via electrolysis) or natural gas (via steam methane reforming). The current hydrogen fuel price at retail stations ranges from EUR 10-14 per kg in Europe and USD 10-20 per kg in the United States. Because a fuel cell vehicle uses roughly 1 kg per 100 km, hydrogen is broadly cost-competitive with petrol on a per-kilometre basis in high-tax European markets, but not yet in the US where petrol is cheaper. The IEA Global Hydrogen Review tracks production costs, infrastructure deployment and policy incentives across major markets, while the U.S. EIA hydrogen explainer covers American production pathways and costs.

The hydrogen fuel price is expected to fall substantially over the next decade as green hydrogen electrolyser manufacturing scales up and renewable electricity costs continue to decline. The European Commission's hydrogen strategy targets 10 million tonnes of domestic green hydrogen production by 2030, which would significantly expand refuelling infrastructure and drive retail prices downward. For heavy-duty transport — trucks, buses, port equipment — hydrogen's fast refuelling time (3-5 minutes versus 20-40 minutes for battery EV fast charging) gives it a structural advantage that is likely to sustain commercial demand even as passenger car adoption remains slow.