Campion, Shapiro-Bengtsen reported that where a substantial portion of electricity generation relies on fossil fuels, e-fuel production using renewable power demonstrates significant advantages in terms of GHG intensity. However, even with 47% renewable power in the mix, the life cycle emissions remain only 25% lower than those of traditional grey methanol. The findings indicate that the GHG footprint of e-fuels remains higher than that of grey fuels, particularly in regions with a larger share of fossil-based grid electricity. This review highlights the significance of transitioning to cleaner energy sources to optimize the sustainability of e-ammonia production.