Methanol production is one promising way to minimize the ecological impact of the conventional steelmaking process. This synthesis needs additional hydrogen, preferably produced from a green power source. In this paper, the influence of different power supply scenarios, gas storage volumes, and hydrogen production capacities on the overall carbon saving potential - defined as carbon binding ratio - from a flexible methanol production case will be investigated. A mixed-integer linear programming model with rolling horizon is used to calculate the optimal production plan.