The main objective of load frequency control (LFC) is to minimize the deviations in frequency and tie line power due to different load disturbances. This paper presents load frequency control of multi area interconnected power system with three single area systems using conventional controllers and artificial intelligence(AI) based techniques – Fuzzy and Artificial Neural Networks. The advantage of AI based controllers is that it can handle the non linear ties and at the same time it is faster than other controllers. Studies are carried out with Fuzzy and Fuzzy PID and compared with conventional controllers and finally concluded that AI based controllers gives better performance. The techniques are implemented in MATLAB/SIMULINK.