Gas power plants are widely used to produce power in the world because of their low cost, speed of installation and rapid response to electricity changes in the electrical network. These stations are negatively affected by the temperature of the air. In hot days of summer, the demand for electric power increases while the capacity of the gas turbine deteriorates. In this paper, an analysis of the measured values recorded for a gas power plant with a design capacity of 264 megawatts located in Al-Korymat, southern Egypt. By using this data, the cooling degree-hours were calculated based on the ambient temperature and relative humidity recorded in the station. The cooling degree-hours gave an idea of the potential for using a fogger and an evaporative cooler to cool the gas turbine air in this region. The results showed that gas turbine can operate 12 hours in case of base temperature 20 ºC with 7750-degree-hours in July. Through the recorded values, the results of the analysis showed that operating the fogger during the peak hours of high temperature in summer gives a power of 16 megawatts higher than the power just before operating the fogger. The electrical efficiency increased by 3.5%. When the fogger is turned on at air temperature of 38 ºC, the specific fuel consumption decreases by 1.8%, and when the compressor inlet temperature drops from 35 ºC to 18 ºC, the exit temperature from the compressor decreases from 445 ºC to 413 ºC, which is a decrease of 7.2%