 This paper examines the environmental impacts of three energy portfolios in Iran. The first portfolio is based on current energy consumption levels, while the second and third portfolios assume a future scenario where energy consumption increases by 50%. The authors use life cycle assessment, LCA, to measure the environmental impacts of each portfolio. They find that the second portfolio, which assumes a higher level of renewable energy sources, has the lowest environmental impacts. In this scenario, the authors also examine the potential economic benefits of using renewable energy sources. They find that the second portfolio would result in a net benefit of billion per year, while the third portfolio would result in a net benefit of zero billion per year. This article was authored by Amir Hossein CD and a bullfazel Amadi.