From Aspiration to Economics: What Has Actually Changed
Green hydrogen — hydrogen produced by electrolysis of water powered by renewable electricity — has been positioned as a cornerstone of the global decarbonisation strategy for the better part of a decade. The fundamental chemistry is straightforward and well-established: pass electricity through water, split it into hydrogen and oxygen, collect the hydrogen for use as a fuel or industrial feedstock. The challenge has been economics rather than technology. Green hydrogen produced by water electrolysis has cost several times more per unit of energy than the grey hydrogen produced from natural gas that it is intended to replace, and the capital cost of electrolysers has been sufficiently high that the levelised cost of production remained uncompetitive across almost all potential application markets without substantial policy support. The credibility of green hydrogen as a near-term industrial decarbonisation tool has consequently oscillated with the optimism or pessimism of the analyst making the cost projection, and the market has learned to treat green hydrogen cost forecasts with significant scepticism after a decade of projections that consistently underestimated cost reduction pace while overstating deployment pace.
The evidence that the green hydrogen cost curve is now genuinely moving comes from the combination of electrolyser cost data, renewable electricity price trajectories, and the commercial terms of green hydrogen supply agreements being announced with increasing frequency. The capital cost of alkaline and proton exchange membrane electrolysers has fallen substantially from the levels of five years ago, driven by manufacturing scale-up, supply chain development, and design optimisation that have progressed further and faster than many analysts expected. In regions with abundant and cheap renewable electricity — the Middle East, North Africa, Chile's Atacama Desert, Australia, and the US Southwest — the all-in cost of green hydrogen production from dedicated renewable generation assets has fallen to levels approaching commercial competitiveness with grey hydrogen at current natural gas prices, particularly when carbon costs under tightening regulatory frameworks are included in the comparison.
The Industries Where Green Hydrogen Economics First Close
The industrial decarbonisation applications where green hydrogen economics are closing first are those where the alternative to hydrogen use is another form of hydrogen — making the comparison a direct green versus grey cost differential — or a process with no viable electrification alternative. Ammonia production is the largest and most commercially advanced application: approximately half of global ammonia production uses hydrogen as a feedstock, and the nitrogen fertiliser industry represents a significant proportion of the total addressable market for green hydrogen as a grey hydrogen substitute. Green ammonia projects — integrating electrolysis, air separation, and Haber-Bosch synthesis in a single renewable-powered complex — are at various stages of development across the Middle East, Australia, Chile, and Oman, with the most advanced approaching final investment decision. The commercial case rests on tightening carbon pricing, sustainability requirements of fertiliser buyers, and the declining cost of renewable electricity and electrolysis capacity.
Steel decarbonisation represents the second major industrial application, in the form of direct reduced iron production using hydrogen as the reductant rather than the coal-derived gases that conventional blast furnace steelmaking employs. The hydrogen direct reduced iron route produces essentially zero process CO2 emissions, and the electric arc furnace steelmaking that processes the resulting sponge iron can be powered by renewable electricity. SSAB in Sweden, ThyssenKrupp in Germany, ArcelorMittal across multiple sites, and Voestalpine in Austria are all at various stages of hydrogen-based direct reduced iron development, with SSAB's HYBRIT project having produced the world's first fossil-free steel. In European markets subject to the EU ETS and the Carbon Border Adjustment Mechanism, the cost gap between hydrogen-based steel and conventional blast furnace steel is narrowing to commercially bridgeable levels that make investment decisions viable within current policy frameworks.
Electrolyser Manufacturing: The Bottleneck Becoming a Market
The electrolyser manufacturing industry — which produces the core technology of green hydrogen production — is undergoing a structural transformation driven by the scale of investment being directed into green hydrogen projects globally. The electrolyser market was, until recently, a small-scale engineering business serving a niche industrial gas market with relatively low custom equipment volumes. The pipeline of announced green hydrogen projects has created demand projections requiring electrolyser manufacturing capacity to scale by orders of magnitude from current levels, and capital investment is being directed into manufacturing scale-up by established electrolysis technology companies including Nel, ITM Power, and Cummins, and by large industrial gas companies including Air Liquide, Linde, and Air Products that are vertically integrating into electrolyser production.
The manufacturers achieving the most aggressive cost reduction are in China, where state support for green hydrogen development has driven electrolyser manufacturing investment at a pace and scale that has placed Chinese suppliers in a position to offer electrolyser systems at costs substantially below those of European and North American competitors. The competitive dynamic between Chinese electrolyser manufacturers and their Western counterparts — in which Chinese cost advantages are offset by supply chain security concerns, technology transfer risks, and procurement preferences for domestic or allied-nation suppliers in some markets — will be a defining feature of the global green hydrogen supply chain over the next five years. The resolution of this competition will significantly influence the pace of green hydrogen cost reduction and the geographic distribution of electrolyser manufacturing value.
Policy Architecture and Project Investability
The commercial deployment of green hydrogen at industrial scale is dependent on a policy architecture that bridges the cost gap between green and grey hydrogen during the period in which cost reductions are being driven by scale and learning curve effects rather than by an unaided market. The US Inflation Reduction Act's clean hydrogen production tax credit — providing up to $3 per kilogram of hydrogen produced with sufficiently low lifecycle carbon intensity — has been the most significant single policy development for green hydrogen project economics, making US-produced green hydrogen commercially competitive with grey hydrogen at current natural gas prices in a range of project configurations. The EU's Hydrogen Bank, which provides competitive grants to green hydrogen projects through an auction mechanism, and the green hydrogen import support frameworks being developed by Germany, Japan, and South Korea are collectively creating a policy environment in which green hydrogen project financing is becoming structurally more achievable.
The industrial decarbonisation inflection that green hydrogen represents is not yet a market reality at scale, but the combination of falling production costs and maturing policy support means that the gap between current commercial reality and the projected scale of green hydrogen deployment is narrowing at a pace that justifies genuine industrial planning around hydrogen as a decarbonisation pathway. The companies and countries that are investing in green hydrogen supply chain development now — before the cost curve has fully closed — are positioning themselves to benefit from first-mover advantages in a market that will be substantially larger in five years than it is today, and whose structure and competitive dynamics are still being established in ways that create durable advantages for early participants with the financial capacity and strategic conviction to act ahead of certainty.