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In this paper, an auto tuned load frequency controller based on Fuzzy Wavelet Neural Network (FWNN) and Shuffled Frog Leaping Algorithm (SFLA) is employed to damp the deviations of frequency and tie line power due to the load disturbances in a multi-area power system. Optimal tuning of the FWNN parameters is very important to improve the design performance and achieve a satisfactory level of robustness, for a particular operation. In this work, a new systematic tuning method is developed for designing the FWNN load frequency controller. For this, the error between the desired system output and output of control object is employed to tune the FWNN parameters. Tuning rule is accomplished based on SFLA approach by minimizing a combination of control error. To show the effectiveness of the proposed method, some numerical results are presented for a two area power system considering governor saturation and the results are compared to the obtained results by a classic PI controller and a fuzzy load frequency controller. Moreover, the robustness of the proposed method is tested against change of parameters. The simulation studies show that the designed controller by proposed method has a very desirable dynamic performance, better operation and improved system parameters such as settling time and step response rise time even when the system parameters change. [ABSTRACT FROM AUTHOR]