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Identifying potential locations for installation of solar power plants is a critical step in utilizing sustainable energy resources. In this study, a GIS-based Multi-Criteria Decision Analysis (GIS-MCDA) technique is used to generate maps that represent potential areas for solar power plants in four provinces with different climate conditions in Iran. The concept of risk is included in the GIS-MCDA process using the Ordered Weighted Averaging (OWA) model. The OWA model can provide various risk-taking (optimistic) and risk-aversion (pessimistic) scenarios to determine the suitable power plant areas. The results of this study indicate that provinces located in an arid climate such as Yazd contain a more suitable area for the solar power plants compared to wet climate provinces (e.g., Mazandaran). The sensitivity analysis of results show that the criterion "fault" has the minimum effect while the criteria "slope" and "road network" have the maximum effects on the area of the highly desirable class. • The GIS-MCDA is used to evaluate the locations for establishment of solar power plants. • The evaluation process involves the locations in different climate conditions. • An OWA-based technique is utilized to incorporate risk in solar energy assessment. • The sensitivity of results to each criterion is evaluated. [ABSTRACT FROM AUTHOR]