Energy, water, and environmental impacts assessment of electricity generation in Iran

This paper uses a hybrid life cycle assessment method to assess the energy, water, and environmental impacts of high-voltage electricity generation in Iran based on Cumulative Energy Demand and ReCiPe 2016 methods. The aim is to determine the share of renewable and nonrenewable technologies in the associated impacts in order to inform policymakers about proper mitigation strategies. Assessments based on a cradle-to-gate approach showed that producing 1 kWh high-voltage electricity by Iran's public sector is accompanied by 511 g-CO2-eq. green -house gas emissions, 9.52 MJ energy consumption, and 37 l water use. Natural-gas-firing single-cycle power plants (PPs), followed by natural-gas-firing combined cycle PPs, have the highest contributions to the life-cycle impacts of electricity generation in this country. Moreover, the consumption of liquid fossil fuels (diesel and heavy fuel oil) during the shortage of natural gas in cold seasons further escalates their contributions. The share of wind and hydropower plants in the resulting impacts was trivial by comparison. Findings suggested that an adequate supply of PPs with natural gas during clod seasons can partly lower water and environmental impacts of high-voltage electricity generation, but increasing the share of renewables in the electricity mix can consid-erably reduce most energy, water, and environment-related impacts.

Automated summary

This study adopts a hybrid life cycle assessment method to evaluate the energy, water, and environmental impacts of high-voltage electricity generation in Iran. The findings indicate that natural gas-fired power plants contribute the most to the life-cycle impacts of electricity generation, while wind and hydropower plants have minimal contributions. The study suggests that ensuring an adequate supply of natural gas during cold seasons can partially reduce water and environmental impacts, but increasing the share of renewable energy can significantly reduce the overall impacts.