This paper addresses some of the technical and economic aspects of coupling a tidal energy plant with a local electrical grid for hydrogen production. Here, the annual tidal current data are treated to obtain seasonal distributions. Three reference daily profiles are then deduced, representing for each season the highest, average, and lowest cases respectively. The corresponding hydrogen production is evaluated for both tidal plant alone and tidal-grid-connected configurations. The study particularly analyses the hydrogen price variation based on different seasonal daily tidal profiles and the target hydrogen production. The model can be used as a generic tool to estimate hydrogen production with the associated costs representing the core of the system optimization process.