Sites with abundantly available water (and H2) resources probably profit from using the simpler SPO concept, which comes along with higher hydrogen consumption. Main advantage is that the required number of unit operations and equipment is low, while excess hydrogen is purged into the atmosphere or used for energy generation. However, sites with scarce availability of H2, may profit from its efficient usage, for which the RO concept with lower hydrogen consumption is beneficial. However, this process variant entails additional equipment, which increases weight, transport costs, process complexity, and the risk of failure.