The presentation analyses two hydrogen infrastructure projects for heavy-duty mobility in Spain. The first case concerns a pioneering hydrogen generation and refuelling station for bus fleets, integrating on-site PEM hydrogen production with photovoltaic power contribution, as well as compression, storage, and dispensing within a single facility. The second case examines a hydrogen dispensing station designed for hydrogen storage and vehicle refuelling within a strategic industrial and innovation hub.

The novelty of the paper lies in the comparative engineering analysis of two distinct hydrogen refuelling configurations, drawing on direct experience from basic engineering and owner’s engineering, the work focuses on practical solutions for system integration, safety, operability, and project execution.

The paper highlights lessons learned in renewable power interfacing, plant layout, package interconnection, hazardous area classification, regulatory compliance, and reliability-oriented design. The comparison provides practical recommendations to reduce integration risks and support the scalable deployment of hydrogen infrastructure for heavy-duty mobility.