Background & Objectives: Environmental crisis causes deep concern in different levels human societies and it is necessary to consider the environmental criteria in the development activities to solve this problem.  Due to the nature of the transferred fluid, the exploitation of oil transmission line and petroleum products has some potentially environmental risks and events. This study aimed to evaluate the environmental effects of the fuel transmission line to combined cycle powerhouse of Chabahar project using Iranian matrix-based method.

Materials & Methods: In this study, the environmental effects of the fuel transmission line to combined cycle powerhouse of Chabahar project was evaluated in all physical, biological and socio-economic and cultural environments in structural and exploitation phases.

Results: Total positive effects of study in structural and exploitation phases was calculated (+81) and total negative effects in physical, biological and socio-economic and cultural environments was assessed (-112) and the difference was (-31).

Conclusion: Due to the analysis, no average rating less than (-2) was found in all evaluation matrix's rows and columns. Therefore, fueling to combined cycle powerhouse project is approved.