ABSTRACT Load Frequency Control (LFC) is an important control problem encountered in interconnected power systems. Most of the LFC studies are concerned with the design of different controller types and validating the design using the commonly available power system models in the literature. In this project, a model was built for the selected power system. The LFC model was developed for a single area power system and for an interconnected power system consisting of two areas. The conventional integral LFC technique was reviewed, and its advantages and disadvantages were highlighted. Another LFC design using PDD technique was used to overcome the disadvantages of the integral technique. In this LFC design, Particle Swarm Optimization (PSO) was used to optimize the parameters of the PID controllers. In the last part of the project, fuzzy logic control was used to design the load frequency controller. PSO was also used as an optimization technique to optimize the parameters of the fuzzy logic control. Thus, this controller has been called Fuzzy Swarm load frequency controller. Design of PID-swarm and Fuzzy-Swarm LF controller were carried out using MATLAB/Simulink and Fuzzy Logic toolboxes. The designed controllers were compared with the commonly available controllers .