Nowadays, many thermal power plants are established for the generation of electrical energy. In this study, the design of a Gas Turbine Power Plant is analyzed in Ambarli, Turkey. Then, conventional and modern control techniques are applied for comparison. These controllers are conventional proportional and integral (PI), particle swarm optimization based proportional integral (PSO-PI) and fuzzy gain scheduled proportional integral (FGPI). The results show that, the performance of the proposed FGPI is better than the conventional controllers on settling time and overshoot of power outputs.