The source of energy or electricity have a greater impact on the overall environmental performance of a WW treatment as well as the nutrient recovery system. The energy source must have a significantly reduced carbon footprint to have a less impact on the environment . Replacing fossil fuels with renewable energy can have a significant impact towards the reduction of GHGs. In this regard, a stepwise (25%) incremental share of renewable energy was used to analyse the effect of reduction in GWP.