A hydrogen supply chain optimised for cost alone looks very different from one optimised for emissions, jobs or safety. A study in the International Journal of Hydrogen Energy applies a multi objective model to the Brazilian state of Bahia and shows how the preferred production route and logistics shift as the objective changes. The authors are Leonardo Santana, Fernando Pessoa and Ana Barbosa-Póvoa.
How the hydrogen supply chain model works
The study proposes a multi objective mixed integer linear programming model for the strategic design and planning of a hydrogen supply chain over several periods. It evaluates four things at once: the levelised cost of hydrogen, global warming potential, social benefit and safety risk. Hydrogen losses are included in the mass balance and in the emissions calculation, so fugitive leakage counts against each pathway. Social benefit combines employment with regional socioeconomic factors.
Why Bahia is a useful test for a hydrogen supply chain
Bahia combines high renewable potential with strong differences in income and development between regions, which makes the location of production and the choice of transport as much a social question as a cost one. The state is the model’s single case study, so the results describe a planning method rather than a Brazilian forecast.
What changes between objectives
Minimum cost solutions favour centralised production labelled Bio SMR and truck based logistics. Minimum emissions solutions use more Bio SMR combined with carbon capture and storage and produce a more distributed network. Solutions weighted towards social benefit and safety are more decentralised still and rely more heavily on PEM electrolysis. A Pareto front analysis then identifies a knee point that balances all four objectives.
The pattern is the useful finding. Centralisation corresponds to the lowest cost, while the social and safety objectives push towards a more decentralised network. Electrolysis gains share mainly when those two objectives are weighted, which indicates that cost and emissions alone do not favour it in this setting.
Limits of the hydrogen supply chain results
The abstract reports no cost or emissions values, so it is not possible to say how large the trade offs are or how far the knee point sits from each extreme. Those figures are in the full paper, International Journal of Hydrogen Energy, article 158240. For readers following Brazilian projects, Germany’s backing for a €2 billion Brazil green hydrogen project shows where large scale electrolysis is already being financed.
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