A hydrogen generation electricity system for producing electricity from hydrogen using a hydrogen carrier substance, the system comprising:
- a reaction chamber arranged for generating a H2 gas stream by converting the hydrogen carrier substance, wherein the reaction chamber comprises an inlet arranged for receiving the hydrogen carrier substance;
- an output conduit for exiting the H2 gas stream from the reaction chamber;
- a fuel cell arranged for producing electric energy by converting hydrogen;
- a humidity determining unit arranged for determining a humidity level of the H2 gas stream;
- a water providing means for providing H2O to the reaction chamber;
- and
- a water vapour control means arranged for controlling the water vapour level in the reaction chamber in response to the determined humidity level of the H2 gas stream,
- wherein the output conduit is arranged for supplying the H2 gas stream from the reaction chamber to the fuel cell, and
- wherein the generated H2 gas stream comprises hydrogen and water vapour.