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Hydrogen production technology continues to evolve as larger projects move from demonstration to commercial operation. New research published in 2026 provides an updated comparison of the two most widely deployed electrolyzer technologies: alkaline and proton exchange membrane (PEM).
Data referenced by John Cockerill from BloombergNEF and the World Bank shows that alkaline technology continues to dominate current deployment, while PEM systems are scaling to increasingly large installations.
For transport-related hydrogen projects, the comparison is particularly relevant because production efficiency, operating flexibility, output pressure and infrastructure costs can all influence the economics of hydrogen supply.
According to the research, alkaline systems account for around 84% of electrolyzer projects currently under construction worldwide.
The technology has been used industrially for decades and has also evolved significantly. Recent developments include advanced zirconia-based separators, nickel-alloy electrodes, improved stack architecture and digital monitoring systems.
Pressurized alkaline systems are designed to produce hydrogen at elevated pressure, potentially reducing the need for additional downstream compression.
At system level, BloombergNEF's 2026 data indicates that Western alkaline systems consumed approximately 54.6 kWh per kilogram of hydrogen in 2025, compared with around 55.1 kWh/kg for Western PEM systems.
PEM technology offers a more compact architecture, high current density and rapid response to changing power inputs.
These characteristics can be useful in applications where space, hydrogen purity or dynamic operation are important considerations.
PEM installations have now exceeded 50 MW in several projects, although the research notes that long-term operating data at this scale remains limited.
PEM systems also rely on materials including iridium and platinum, creating additional cost and supply-chain considerations.
One of the most important findings concerns how electrolyzer performance is measured.
There are currently no universally applied industry standards for calculating parameters such as degradation, efficiency, minimum operating load and restart times. As a result, figures from different manufacturers may not always be directly comparable.
The latest data also suggests that some previously published expectations for PEM restart times and lifetime are being revised as more operating information becomes available.
For buyers and project developers, this makes real-world references increasingly important when evaluating electrolyzer systems.
There is no single electrolyzer technology that provides the best performance under every operating condition.
Project developers need to consider factors including electricity cost, renewable-energy variability, hydrogen pressure requirements, available space, installation scale and expected operating profile.
For hydrogen infrastructure supporting mobility applications, these parameters can influence not only hydrogen production costs but also compression requirements, storage architecture and overall system design.
As hydrogen projects continue to scale, comparing technologies on the basis of complete system performance rather than individual specifications will become increasingly important.
