This project is design based on the paper "Optimal Location of FACTS for ATC Enhancement". The objective of this paper is to enhance the Available Transfer Capability (ATC) from source area to sink area in deregulated power system using Continuous Power Flow (CPF) method during normal and contingency cases with optimal location and control parameter of Flexible AC Transmission System (FACTS) devices such as Thyristor Controlled Series Capacitor (TCSC) or Static VAR Compensator (SVC) on IEEE 24 bus reliability test systems. Genetic Algorithm and Firefly Algorithm are used to determine the optimal location and control parameter of TCSC or SVC. ATC is dependent on many factors, such as the base case of system operation, system operation limits, network configuration, the specification of contingencies, etc. FACTS technology has a severe impact on the transmission system utilization with regards to those constraints on ATC.