Hydrogen can be produced by splitting water with electricity, a process known as electrolysis. In principle this yields a clean fuel whose only by-product when used is water. The idea is elegant, yet hydrogen does not power cars, homes, factories or grids at large scale today. The reasons are rooted in physics, economics and infrastructure rather than a simple lack of interest or technology.
Energy Losses at Every Step
Electrolysis is never 100 percent efficient. Converting electrical energy into chemical energy stored in hydrogen typically retains 60 to 80 percent of the input, depending on the technology and operating conditions. The hydrogen must then be compressed, cooled or converted into a denser form for storage and transport. Each of those steps consumes more energy. When the hydrogen is finally turned back into useful work through a fuel cell or combustion, further losses occur.
The full chain from renewable electricity to final energy service can leave only a fraction of the original electricity available as usable power. Direct use of that same electricity in a battery, heat pump or electric motor is usually far more efficient. For many applications the round-trip penalty makes hydrogen an expensive way to move energy.
Cost Is Dominated by Electricity
The largest single component of green hydrogen cost is the electricity required to run the electrolysers. Even with falling renewable power prices, the quantity of electricity needed remains high. Capital costs for electrolysers, compressors, storage vessels and related equipment add further expense. Current production costs for electrolytic hydrogen remain several times higher than hydrogen made from natural gas in most markets.
Learning rates and manufacturing scale have improved some components, yet the fundamental dependence on large volumes of low-cost, continuously available electricity limits how quickly the overall price can fall. Targets of very low-cost green hydrogen have repeatedly proven harder to reach than early projections suggested once real project data, financing costs and system integration are included.
Physical Properties Create Infrastructure Challenges
Hydrogen has excellent energy content by weight but very low energy content by volume. At atmospheric pressure it occupies far more space than natural gas or liquid fuels for the same energy. Practical use therefore requires high-pressure compression, liquefaction at extremely low temperatures, or conversion into carriers such as ammonia. Each approach adds cost, energy use and engineering complexity.
Hydrogen can also embrittle certain metals and is prone to leakage because of its small molecular size. Pipelines, tanks, valves and end-use equipment must be designed or adapted specifically for it. Building a new dedicated network or extensively modifying existing gas infrastructure is capital-intensive and slow. These physical realities raise both the cost and the timeline for widespread deployment.
Scale and Competition with Direct Electrification
Global electrolytic hydrogen capacity remains modest compared with the volumes that would be required to replace a meaningful share of fossil fuels. Most hydrogen produced today still comes from fossil sources. Scaling electrolysis to the level needed for “powering everything” would demand enormous additional renewable generation, electrolyser manufacturing and supporting infrastructure, all developed in parallel with demand.
In many end uses, direct electrification is already cheaper and more efficient. Battery electric vehicles, electric heat pumps and electric industrial processes avoid the conversion losses inherent in a hydrogen pathway. Hydrogen is more competitive in niches where batteries or direct electricity struggle: certain high-temperature industrial processes, long-duration seasonal storage, or long-haul transport where weight and refuelling time matter. Even in those areas, cost and infrastructure remain significant hurdles.
Water, Materials and System Integration
Large-scale electrolysis requires substantial volumes of purified water and can face local constraints in water-scarce regions. Some electrolyser designs rely on scarce catalysts such as iridium, creating potential supply bottlenecks if deployment accelerates rapidly. Integrating intermittent renewable power with continuous or flexible electrolyser operation adds further system design challenges and costs.
Where Hydrogen Still Makes Sense
None of these barriers means hydrogen has no role. It remains valuable as an industrial feedstock, a potential route for storing surplus renewable electricity over long periods, and a candidate fuel for applications that are difficult to electrify directly. Progress continues in electrolyser technology, project development and targeted policy support. The gap between laboratory possibility and everyday ubiquity is explained by the cumulative effect of efficiency losses, high energy and capital costs, difficult storage and transport, and stronger competing solutions for many uses.
Hydrogen from water is real and technically feasible. It is not yet cheap, efficient or convenient enough to power everything. Closing that gap requires continued cost reduction, infrastructure build-out and careful matching of hydrogen to the applications where its properties offer genuine advantages over direct electrification.
What applications do you think hydrogen is best suited for, and where do you see direct electricity or other solutions as more practical? Share your view.
Frequently Asked Questions
Can hydrogen really be made from water?
Yes. Electrolysis uses electricity to split water into hydrogen and oxygen. When the electricity comes from renewable sources the hydrogen is often called green hydrogen.
Why is it still expensive?
Electricity dominates the cost. Additional expenses for equipment, compression, storage and transport keep the final price higher than fossil-based hydrogen or direct use of electricity in many cases.
How efficient is the process?
Electrolysis itself is typically 60 to 80 percent efficient. Further losses occur during compression, storage, transport and conversion back to useful energy, reducing the overall system efficiency.
Why not just use batteries instead?
For cars, short-duration storage and many buildings, batteries and direct electrification are usually more efficient and already cheaper. Hydrogen is more relevant where batteries face limits of weight, duration or high-temperature process needs.
Is infrastructure the biggest barrier?
It is one of the major barriers. Hydrogen’s low volumetric density and material compatibility issues make pipelines, tanks and refuelling networks costly and complex to build at scale.
Will hydrogen eventually power most things?
Most analyses suggest it will play a selective role rather than replace electricity or other fuels across the entire economy. Its best opportunities lie in hard-to-electrify sectors and long-duration storage.
Reference links:
https://cleantechnica.com/2025/11/10/why-hydrogen-isnt-cutting-costs-like-solar-or-batteries/
https://www.nature.com/articles/s44359-025-00050-4
https://pubs.rsc.org/gc/article/27/23/6690/893644/The-hydrogen-economy-fairytale
https://www.innovationnewsnetwork.com/renewable-hydrogen-major-promise-or-a-missed-opportunity/73611/
https://link.springer.com/article/10.1007/s44373-025-00043-9
https://www.gem.wiki/Hydrogen_Electrolysis
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