The Four Steps of Power-to-Liquid — From Electricity to Fuel

Every electrofuel production facility follows the same fundamental sequence, regardless of whether it produces e-kerosene, e-petrol, e-diesel or e-methanol. The four core steps are hydrogen production, CO₂ capture, synthesis gas generation, and Fischer-Tropsch fuel synthesis. Each step has its own efficiency profile, cost drivers and technology options — and each is the subject of active industrial development.

INERATEC’s microstructured Fischer-Tropsch reactors — developed at KIT, commercialised via spin-off · modular container-based design · ERA ONE Frankfurt Höchst: Europe’s largest PtL facility · full commissioning June 2025 · Photo: Unsplash

Fischer-Tropsch — The Core Chemistry That Has Not Changed Since 1925

The Fischer-Tropsch process was developed by German chemists Franz Fischer and Hans Tropsch at the Kaiser Wilhelm Institute in 1925. The core reaction is straightforward: carbon monoxide and hydrogen — the synthesis gas — react in the presence of a metal catalyst to produce long-chain hydrocarbon molecules. These molecules are chemically identical to those found in fossil fuels. The same process was used by Nazi Germany to produce synthetic fuels from coal, and by South Africa’s Sasol to produce fuels from coal and natural gas throughout the apartheid era.

What makes the modern Power-to-Liquid application different is not the chemistry — it is the feedstock. Instead of fossil carbon from coal or natural gas, the carbon comes from captured CO₂. Instead of fossil-derived hydrogen, the hydrogen comes from water electrolysis powered by renewable electricity. The result is a fuel that is chemically identical to fossil petrol or kerosene but produced with near-zero net lifecycle carbon emissions.

INERATEC ERA ONE — Europe’s Most Advanced PtL Plant

INERATEC’s ERA ONE facility at Frankfurt Höchst Industrial Park is currently the most advanced Power-to-Liquid plant in Europe. Fully commissioned in June 2025, it uses microstructured Fischer-Tropsch reactors — a KIT innovation — that are highly efficient, modular and container-scalable. The plant produces synthetic fuels including e-kerosene on a ton scale for the first time.

In 2026, INERATEC and Sasol Chemicals deepened their partnership with a signed Letter of Intent targeting a 15% boost in e-SAF yield through next-generation cobalt-based Fischer-Tropsch catalysts. The advanced catalyst, expected to be commercially available by 2026, will be deployed across INERATEC’s PtL plants. Sasol’s cobalt catalysts are the result of nearly a century of innovation, originating from the pioneering work of Fischer and Tropsch and brought to industrial scale by Sasol since the 1950s.

ERA ONE at Frankfurt Höchst Industrial Park — Europe’s largest Fischer-Tropsch PtL facility · commissioned June 2025 · INERATEC + Sasol cobalt catalyst · 3,500 t/yr e-kerosene capacity · Photo: Unsplash

The Heat Recovery Advantage — Why Exothermic Reaction Matters

One of the most economically important features of the Fischer-Tropsch process is that it is exothermic — it releases heat. In a well-designed Power-to-Liquid plant, this heat is continuously recovered and used in other process steps — particularly in the reverse water-gas shift reaction and in the electrolysis preheating. Norsk e-Fuel’s process design explicitly recovers the significant heat produced in the FT reactor, using it in upstream process steps to increase overall efficiency.

This heat recovery is not a minor optimization — it is central to the economic case for electrofuels. Research from Karlsruhe Institute of Technology shows that carbon-to-fuel conversion can reach 91% in fully electrified PtL configurations with proper heat integration, compared to 37% in biomass-only configurations. The difference represents the gap between an economically marginal process and a commercially viable one.

The Natural Hydrogen Game-Changer — Why Lorraine Changes All the Maths

Every economic analysis of electrofuels arrives at the same bottleneck: the cost of green hydrogen. At current electrolytic green hydrogen prices of €6.20 per kilogram in Europe, e-petrol costs approximately €3.40 per litre to produce and e-kerosene approximately €7.70 per litre — multiples of their fossil equivalents. The electrolyser electricity cost alone accounts for 60 to 70% of total production cost.

Natural geological hydrogen — if confirmed commercially viable at the REGALOR II borehole in Lorraine and potentially in the Belgian subsoil under the BE.Hydrogen programme — targets a production cost of €0.50 per kilogram. At that price, extracted from the ground without electrolysis and without electricity input, the entire economics of Power-to-Liquid fuels changes:

The Greater Region — Belgium, Luxembourg, Lorraine and Saarland — already has the industrial CO₂ sources (ArcelorMittal, TotalEnergies Feluy), the planned hydrogen transport infrastructure (HY4Link pipeline, EU PCI status), and the proximity to Europe’s largest automotive and aviation clusters. If Lorraine natural hydrogen is confirmed at scale in 2027, the Greater Region has every element needed for Europe’s first cost-competitive electrofuel production hub.

The Fischer-Tropsch process has been waiting a century for the right hydrogen feedstock. Natural hydrogen may be the answer that makes it commercially inevitable.