Hydrogen is an industrial feedstock and energy carrier, not a primary energy source. It can be produced from fossil fuels, biomass or electricity and then used in chemicals, refining, steel, shipping fuels, storage or fuel cells. Its value depends heavily on how it is made and where it is used.
Most hydrogen is still fossil-based
Global hydrogen production is dominated by natural gas and coal and creates substantial emissions. Low-emissions production is growing from a very small base. Calling hydrogen clean without naming its production method is misleading.
Green hydrogen has large conversion losses
Electrolysis converts electricity into hydrogen, which may then be compressed, liquefied, transported or converted into ammonia and back into energy. Each step loses energy. Direct electrification is usually more efficient where a wire or battery can perform the task.
Use hydrogen where alternatives are weak
The strongest cases may include replacing fossil hydrogen in fertiliser and refining, reducing iron ore for steel, and producing some aviation or shipping fuels. Heating ordinary buildings and powering most passenger cars are generally harder to justify where efficient electric alternatives exist.
Project announcements are not final investment decisions
The low-emissions hydrogen pipeline has repeatedly been revised downward as projects encounter high costs, uncertain customers and infrastructure delays. Announced capacity should not be counted as future production until financing and demand are secured.
Infrastructure is expensive
Hydrogen can embrittle some metals, has low volumetric energy density and requires specialised storage and leak management. Existing gas networks cannot always be converted cheaply or safely. Ports and industrial clusters may be more practical than a universal distribution network.
Leakage and climate effects
Hydrogen is not itself a greenhouse gas in the same way as carbon dioxide, but leakage can alter atmospheric chemistry and indirectly affect warming. Methane leakage is also crucial when hydrogen is produced from natural gas with carbon capture.
Water and local impacts
Electrolysis requires clean water and electricity. Water demand may be manageable globally but significant in arid project locations, especially when desalination and competing industrial use are considered. Large renewable installations also require land and transmission.
Fuel cells are useful in specific niches
Fuel cells can provide quiet, efficient power where stored hydrogen is already justified. Their economics depend on fuel cost, utilisation and maintenance. They are not automatically preferable to batteries or direct grid connection.
Subsidies should target emissions, not colour labels
Policies should measure lifecycle emissions and additional clean electricity rather than rely only on names such as green or blue. Support is most defensible where hydrogen replaces an unavoidable high-emissions process, not where it competes with a simpler electric solution.
A smaller, more credible hydrogen future
Hydrogen is likely to be important in selected industrial and fuel applications. The idea of a universal hydrogen economy overstates its efficiency and infrastructure advantages. The right question is not whether hydrogen is good, but where its losses are worth accepting.