Hydrogen has had more announced capacity than delivered capacity for most of a decade, and the reason is not electrolysis.
A gap between announcements and steel in the ground
The pattern is consistent enough to plan around. Projects are announced with capacity figures and dates. A minority reach a final investment decision. A meaningful number are quietly cancelled or indefinitely delayed, including several large and well publicised ones.
The reasons are economic rather than technical.
The product costs more than the incumbent. Hydrogen made by electrolysis from low carbon electricity generally costs several times hydrogen made from natural gas, and the gap depends heavily on electricity price and how many hours a year the electrolyser runs.
Buyers are scarce at that price. Projects need committed offtake to finance, and industrial buyers are reluctant to sign long term contracts at a premium without a regulatory reason to do so.
The chicken and egg problem is real. Production waits for demand, demand waits for infrastructure, infrastructure waits for volume. Breaking that requires either policy or a customer with no alternative.
The engineering has largely been demonstrated. What is unresolved is who pays the difference.
For workforce planning, the honest reading is that hydrogen capability is worth building, at a scale matched to projects that have actually reached investment decision rather than to announced pipelines. Anyone in this sector should also be able to read a project announcement and identify what stage it has actually reached, which is a skill in itself.
What the direction covers
The scope: hydrogen production, electrolysis, fuel cells, hydrogen storage and transport, and industrial applications.
Four areas.
Production. Electrolysis technologies, reforming with carbon capture, and the efficiency and durability questions attached to each.
Handling. Compression, liquefaction, storage, pipelines and materials compatibility.
Use. Fuel cells, combustion, and chemical feedstock applications.
Safety and standards. Which is a larger part of this direction than of most.
Why the molecule is difficult to handle
Hydrogen behaves in ways that surprise engineers who have worked with natural gas, and every one of these properties has a cost attached.
It leaks. The smallest molecule finds paths through seals, threaded joints and materials that contain other gases without difficulty. Leak detection and fitting design are different disciplines here.
It embrittles steel. Hydrogen diffuses into many steels and reduces their ductility, which can cause cracking under stress. This is a central materials problem for pipelines, vessels and compressors, and it constrains which existing infrastructure can be reused and under what conditions.
It carries little energy per unit volume. At atmospheric pressure hydrogen holds roughly a third of the energy of natural gas in the same volume, which is why it is stored at very high pressure, liquefied at extremely low temperature, or converted into a carrier such as ammonia. Each option costs energy: liquefaction alone consumes a substantial fraction of the hydrogen's own energy content.
It ignites easily and burns invisibly. A wide flammability range, very low ignition energy and a flame that is nearly invisible in daylight. The hazard is manageable and is managed daily in industry, but it is not the same hazard as natural gas and cannot be handled with the same habits.
Round trip efficiency is poor. Electricity to hydrogen to electricity loses a large majority of the input energy. That is not fatal where the alternative is nothing, and it is decisive wherever direct electrification is possible.
Where this sits in the domain
Hydrogen and fuel cell technology is the fifth of nine directions in Astra Trainer's energy, climate and nuclear domain. It connects to carbon management and industrial decarbonisation, where hydrogen is one of the few options for high temperature process heat and primary steelmaking, and to oil, gas and petrochemical systems, which is where nearly all existing hydrogen expertise currently sits.
It also connects to energy economics, markets and policy, since the viability of almost every project in this direction turns on policy support and electricity pricing rather than on engineering. You can see the nine directions here.
Where hydrogen makes sense, and where the case is weak
Being specific here is more useful than enthusiasm, and it protects an organisation from investing in the wrong application.
Strong: existing industrial hydrogen use. Refining and ammonia production already consume large quantities of hydrogen made from fossil sources. Replacing that supply with low carbon hydrogen requires no new demand, no new infrastructure and no behaviour change. It is the clearest case there is.
Strong: primary steelmaking. Direct reduction of iron using hydrogen is one of very few routes to substantially lower emissions from primary steel, and the alternatives are limited. Several projects are proceeding.
Plausible: chemical feedstock and high temperature process heat, where electrification is difficult and the process needs a molecule rather than electrons.
Plausible: long duration energy storage and seasonal balancing, where poor round trip efficiency matters less than the ability to store energy for months, which batteries cannot do.
Contested: heavy transport, shipping and aviation. Genuine candidates, competing against batteries in trucking and against synthetic and bio-derived fuels in shipping and aviation. The outcome is not settled and reasonable people disagree.
Weak: domestic heating. Heat pumps deliver several units of heat per unit of electricity. Making hydrogen, distributing it and burning it delivers less than one. Multiple independent reviews have reached unfavourable conclusions, and the case rests mainly on reusing existing gas networks.
Weak: most light vehicles. Battery electric vehicles are more efficient, cheaper to run and supported by far more infrastructure.
An honest hydrogen programme concentrates on the first group. A programme that begins with cars and home boilers is usually a policy artefact rather than an engineering plan.
The skills are transferable, which is the good news
The workforce picture here is more favourable than in most of this domain, and it is worth saying plainly.
Hydrogen is not a new industry in the way it is often described. It has been produced and handled at industrial scale for a century, in refineries, ammonia plants and industrial gas operations. The people who do that work already exist.
What they need is a layer rather than a retraining: electrolyser technology and its operating characteristics, the materials compatibility picture for infrastructure not originally designed for hydrogen, the specific safety differences from natural gas, and the commercial and policy framework that determines whether a project is real.
That is a training problem with a short path, and it is unusually well suited to structured, incremental learning delivered to people already working.
The roles, named
Electrolyser engineers. Stack design, system integration, balance of plant.
Process engineers for hydrogen production and purification.
Hydrogen safety engineers. A distinct and growing specialism.
Materials engineers for embrittlement and compatibility assessment.
Fuel cell engineers, for transport and stationary power.
Compression, storage and liquefaction specialists.
Pipeline and infrastructure engineers, including conversion assessment of existing networks.
Plant operators and technicians for production facilities.
Project developers and commercial analysts, because offtake and policy decide these projects.
Who can be trained into it
Industrial gas sector staff. The closest match anywhere. Production, compression, liquefaction, distribution and cylinder handling are already the daily work.
Refinery and ammonia plant operators and engineers. Already handling hydrogen at scale under process safety management.
Oil and gas process and pipeline engineers. Strong transfer, with materials compatibility and the safety differences taught explicitly rather than assumed.
Chemical engineers from any process industry.
Electrical and power electronics engineers. Into electrolyser power systems, which is a substantial part of an electrolyser plant.
Materials and corrosion engineers. Into embrittlement assessment, which is scarce and load bearing.
Process safety specialists. Into hydrogen safety, where existing methodology applies with new hazard data.
Hydrogen is a hazardous substance under strict regulation. It has a wide flammability range, very low ignition energy and a flame that is difficult to see, and it is handled at extreme pressures or cryogenic temperatures. Facilities are covered by major accident hazard, pressure equipment, dangerous goods and site safety regimes that vary by jurisdiction, and safe handling depends on site specific procedures, competence assessment and authorisation. Astra Trainer builds technical understanding. It does not provide hazard training, authorisation, or any permission to design, operate or work on hydrogen systems.
What to take from this
The unresolved question in hydrogen is commercial, not technical, and a large share of announced projects never reach investment decision.
Handling the molecule is the engineering difficulty: leakage, embrittlement, low volumetric energy density and a different ignition hazard from natural gas.
The strong applications are the ones already using hydrogen or lacking an alternative. The weak ones are those where direct electrification simply wins on efficiency.
Round trip efficiency is poor, which matters little for seasonal storage and decisively for anything that could be electrified instead.
And unusually for this domain, the workforce mostly exists already, in refining, ammonia and industrial gases. This is a conversion problem with a short path.
Why do so many hydrogen projects get cancelled?
Because low carbon hydrogen generally costs several times fossil-derived hydrogen, committed buyers are scarce at that price, and production, demand and infrastructure each wait on the others. The barrier is economic rather than technical.
What makes hydrogen hard to handle?
It leaks through joints that contain other gases, embrittles many steels, holds little energy per unit volume so needs extreme pressure or cryogenic temperature, and ignites easily with a nearly invisible flame.
Where does hydrogen clearly make sense?
Replacing existing fossil-derived hydrogen in refining and ammonia, primary steelmaking by direct reduction, some high temperature process heat and chemical feedstock uses, and long duration seasonal storage.
Why is hydrogen heating considered weak?
Because heat pumps deliver several units of heat per unit of electricity while producing, distributing and burning hydrogen delivers less than one. Multiple independent reviews have reached unfavourable conclusions.
Who converts well into hydrogen roles?
Industrial gas staff first, then refinery and ammonia operators who already handle hydrogen at scale, oil and gas process and pipeline engineers, chemical engineers, power electronics engineers into electrolyser systems, and materials engineers into embrittlement work.