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As the global climate crisis intensifies with rising carbon dioxide (CO₂) concentrations, blue hydrogen (H₂) produced through the integration of CO₂ capture technologies is emerging as a promising alternative energy source and is challenging traditional fossil fuels in the de-fossilization paradigm. Gas hydrate could be one of the feasible storage medium for energy-efficient H₂ storage, due to its potential for eco-friendly features and high H₂ storage capacity. However, extreme thermodynamic formation conditions for pure H₂ hydrate need to be mitigated for practical application. Here, we demonstrate a novel approach by blending a ‘gas-phase modulator’ with H₂, specifically a C₂H₆ (70%) + C₃H₈ (30%), to enable hydrate-based H₂ storage under moderate thermodynamic formation conditions. In this study, we systematically examined thermodynamic stability, crystallographic structure, guest occupation behavior …