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The use of hydrogen (H₂) as a substitute for fossil fuel, which accounts for the majority of the world’s energy, is environmentally the most benign option for the reduction of CO₂ emissions. This will require gigawatt-scale storage systems and as such, H₂ storage in porous rocks in the subsurface will be required. Accurate estimation of the thermodynamic and transport properties of H₂ mixed with other gases found within the storage system is therefore essential for the efficient design for the processes involved in this system chain. In this study, we used the established and regarded GERG-2008 Equation of State (EoS) and SuperTRAPP model to predict the thermo-physical properties of H₂ mixed with CH₄, N₂, CO₂, and a typical natural gas from the North-Sea. The data covers a wide range of mole fraction of H₂ (10–90 Mole%), pressures (0.01–100 MPa), and temperatures (200–500 K) with high accuracy and …