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Abstract Underground Hydrogen Storage (UHS) is a long-term storage solution which utilises hydrogen as an energy carrier to store large-scale excess renewable energy in the subsurface. Key petrophysical properties, such as wettability and interfacial tension of hydrogen and water have been discovered which provide a practical basis for simulation models. Our work directly measures relative permeability hysteresis during co-injection core floods of hydrogen and water with a capillary number of N c= 2.92× 10− 7. Segmented micro-CT images are used to determine saturation in the Bentheimer sandstone. Our results demonstrate that hydrogen relative permeability in sandstones is very low, with an end-point relative permeability of k r g 0= 0.049 at S wi= 0.24. Capillary trapping results in residual gas saturation of S gr= 0.4. Wettability analysis confirms the system is water-wet, with contact angles of 57° at S gr and …