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In the present study, the energy, exergy, environmental, and economic (4-E) analyses of Rajai's combined cycle power plant with applying environmentally friendly technologies have been performed. To this end, three scenarios have been considered: (1) without auxiliary systems; (2) with modified guide vane system; (3) integrated guide vane system and inlet air fogging. The angle was increased from 84 $$^\circ $$ ∘ to 86 $$^\circ $$ ∘ to modify the guide vane opening angle of the compressor. Besides, inlet air fogging is used to reduce the compressor's inlet temperature. The results show that the highest exergy destruction ($$\~34\% $$ \~ 34 %) occurred in the combustion chamber. The corresponding values for HRSG and gas turbine are 21% and 26%, respectively. With a modified guide vane system, scenario 2, the cycle's first law efficiency is enhanced by 0.56% compared to scenario 1. In addition, in scenario 3, the second law efficiency increased by 0.67%, and the exergy destruction decreased by 0.85%. By using the proposed system, an increased income of $${h_i}$$ h i .85 per megawatt-hour was gained. Regarding the $$C{O_2}$$ C O 2 emission and fuel consumption, a reduction of 1.65% and 1150 $${m^3}/h$$ m 3 / h was observed. [ABSTRACT FROM AUTHOR]