This study shows how the adaptation of the strategies to provide renewable electricity to mobility via sector coupling can unlock significant optimization potential and increase the chances for penetration of renewable energies and decarbonisation in the mobility sector. The coupling of cheap CO2 supply (e.g., from biogas upgrading in this study) and excess electricity that cannot be absorbed by the mobility sector unlocks favourable scenarios, minimizing the cost of energy storage and ensuring an optimal solution for the continuity of energy supply.