Decarbonization of electricity generation is crucial especially for energy-intensive technologies such as steel mill gas-based methanol production. The Energy System Development Plan is able to forecast the contribution of electricity producers to the power mix in a quarter-hourly resolution. Integration of this forecasts in life cycle assessment enables to prospectively assess the impact on climate change of steel mill gas-based methanol production. The analysis shows that if using power in hours with a high share of renewable energy, the global warming impact of steel mill gas-based methanol production can be lowered.