Green hydrogen: definition and strategic guide for businesses in 2026

What is green hydrogen? Definition and principle

Green hydrogen is an energy carrier produced by water electrolysis, a process that splits water into oxygen and hydrogen without emitting any carbon dioxide at the point of production. It is called green when the electricity used for electrolysis comes from renewable generation: solar, wind, hydroelectric or geothermal.

This distinction is crucial for businesses. Today, more than 99% of hydrogen is still produced from unabated fossil fuels (source: IEA, Global Hydrogen Review 2026): around two-thirds from natural gas, so-called "grey" hydrogen, and roughly 20% from coal, while low-emission hydrogen accounts for less than 1% of global supply, even though installed electrolysis capacity doubled to over 4 GW in 2025. Grey hydrogen emits roughly 9 to 12 tonnes of CO₂ per tonne of hydrogen produced (source: IEA; Clean Energy Group).

Blue hydrogen relies on the same reforming process but captures and stores part of the emissions, and in regulated markets such as the UK it must meet the same low-carbon standards as green. Green hydrogen, by decarbonising production at source rather than depending on capture technologies, offers the clearest long-term trajectory and will play a leading role in delivering hydrogen that is genuinely low carbon.

Grey, blue, green: the three pathways at a glance

Grey, blue and green are the dominant pathways, but not the only ones: nuclear-powered electrolysis ("pink"), methane pyrolysis ("turquoise"), biomass-based routes and naturally occurring ("white") hydrogen also feature in the low-carbon landscape. What matters for compliance is not the colour label but the measured lifecycle carbon intensity (see the RFNBO section below).

For your organisation, the right pathway is a strategic decision shaped by your energy mix, your use cases, the regulatory framework and your cost structure. Where renewable electricity is abundant, green hydrogen is the option that best secures your supply while answering the mounting pressure on scopes 1 and 2 of your carbon footprint.

Decarbonising "hard to abate" industrial sectors

Some sectors pollute heavily (steelmaking, heavy chemicals, refining, glassmaking or cement) and cannot be electrified easily or economically. Here, green hydrogen replaces coal or fossil gas, both as a chemical reactant and as a high-temperature heat source. In steelmaking, for example, hydrogen-based direct reduction (H₂-DRI/EAF) can cut emissions by up to 90 to 95% compared with the conventional blast-furnace route (source: GH2; For Our Climate). Green ammonia production follows the same logic, substituting green hydrogen for its grey feedstock.

Heavy mobility: a credible alternative to all-electric

For heavy goods vehicles, ships or construction machinery, the electric battery reaches its limits: range, charging time, weight and infrastructure.

Hydrogen, stored under pressure, offers unrivalled gravimetric energy density. Fuel cells enable long journeys and refuelling in under 10 minutes. Heavy mobility is thus becoming a fast-maturing use case, supported by dedicated logistics corridors across Europe.

Energy storage and infrastructure resilience

The intermittency of renewable energy (solar, wind) poses a challenge that green hydrogen solves as a form of seasonal storage. Surplus electricity is converted into hydrogen, then released via turbines or fuel cells.

For industrial sites or data centres, this solution guarantees resilience against blackouts and reduces reliance on diesel generators.

Understanding the technology and the rules of the game

Choosing green hydrogen is not only an energy decision, it is a technology and compliance decision. Two fundamentals separate a well-designed project from a stranded asset: the electrolyser technology and the regulatory threshold that defines what counts as "renewable".

Electrolyser technologies: alkaline, PEM, SOEC

Three technologies dominate, with different trade-offs:

• Alkaline is the most mature and lowest-capex option, well suited to stable, continuous operation.
• PEM (proton exchange membrane) is more flexible and responds quickly to variable power, which makes it a good match for intermittent renewables, at a higher cost.
• SOEC (solid oxide) is the most electrically efficient but operates at high temperature and is less mature; it makes most sense when integrated with an industrial waste-heat source.

In practice, commercial PEM and alkaline systems consume roughly 50 to 60 kWh of electricity per kilogram of hydrogen (around 55 to 70% efficiency on an LHV basis), while SOEC can go meaningfully lower when it can draw on external heat (source: Topsoe; TS2, 2025). This choice drives capex, plant footprint and, above all, how well production can follow cheap, abundant renewable power.

The regulatory benchmark: RFNBO under RED III

To be counted as renewable, a Renewable Fuel of Non-Biological Origin (RFNBO), hydrogen must emit no more than 3.38 kgCO₂e per kg of hydrogen, a 70% cut versus a fossil comparator of 94 gCO₂e/MJ (source: IEA; Hydrogen Europe). RED III also sets binding RFNBO targets in industry: 42% of hydrogen use by 2030 and 60% by 2035 (source: IEA, RED III).

For a business, this threshold is not academic. It determines eligibility for subsidies, guarantees of origin and, increasingly, market access. Designing a project below the RFNBO limit is what turns "green intentions" into a bankable, compliant asset.

Profitability levers and financial support for businesses

In 2026, the economics of green hydrogen have changed. Electrolyser costs have fallen sharply: the price of Chinese alkaline systems dropped by around a third in two years, with PEM prices falling even faster, driven by industrialisation and economies of scale (source: Hydrogen Insight, 2024).

The cost gap is closing but not yet closed. Green hydrogen in Europe still costs roughly 7 to 9 €/kg today (source: Clean Hydrogen Observatory; Oeko-Institut, 2025), well above fossil hydrogen, but it is expected to fall towards 2.5 to 4 €/kg as electrolysis scales, with the EU targeting below 2 €/kg by 2030. The core profitability lever remains the sale of the hydrogen itself. On top of this, additional revenue pathways include monetising valuable by-products such as oxygen and capturing the available support mechanisms.

France is maintaining its ambitions through France 2030, targeting up to 4.5 GW of installed electrolysis capacity by 2030 (source: French government). Support combines CAPEX grants for regional hydrogen ecosystems, run by ADEME, with a new production-support mechanism that tops up revenue per kilogram of hydrogen over 15 years; its first wave, in 2025, allocated 778 M€ to 161 MW of electrolysis projects (source: Ministère de l'Économie; ecologie.gouv.fr). In addition, energy savings certificates (CEE) and the hydrogen guarantees of origin scheme make it possible to monetise environmental virtue.

We support businesses in putting together these complex applications within our digital energy solution.

How to steer the integration of green hydrogen into your organisation?

At Talan, we believe technology is not enough: it is systems integration and data-driven governance that make the difference. Our Positive Innovation approach combines strategic consulting, engineering and digital to turn green hydrogen into a profitable operational asset.

Feasibility audit and energy transition roadmap

Every project starts with a field audit: on-site electrolysis potential, the match between local renewable generation and needs, and the maturity of the use cases (heat, mobility, reactant). We analyse the project economics to confirm viability, and engage and identify off-takers to secure end-use demand. We then define a step-by-step roadmap and help you secure the return on investment.

Smart Energy Management: how AI optimises consumption

Hydrogen is not an end in itself: it must be produced when renewable electricity is abundant and cheap. That is the whole point of Smart Energy Management. Thanks to predictive AI, our platforms manage electrolysers, storage and end uses in real time. This approach is at the heart of our smart automation offer.

Securing the hydrogen supply chain through data

Producing green hydrogen is one thing. Distributing, storing and tracing it is another. The hydrogen supply chain involves new constraints (pressure, purity, safety, certification of origin). We deploy digital twin and blockchain solutions to guarantee traceability, flow optimisation and compliance. Discover our dedicated supply chain solutions.

All of these systems fit into a modular, scalable architecture that we deploy through your cloud ecosystem and our expertise in digital transformation.

Industrial use cases: from pilot to scale

Transport and hydrogen logistics (United Kingdom): Talan, through its subsidiary Gemserv, led the Ammogen consortium, a £6.7M project backed by the UK government. The goal: to develop what was, at the time, one of the world's largest and most efficient ammonia-to-hydrogen converters, with a production capacity of 200 kg per day of transport-grade hydrogen.

With tailored support, we can help secure the hydrogen supply chain at scale.