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Abstract In this work, Particle Swarm Optimization (PSO) for the solution of the optimal power flow (OPF) with use of controllable FACTS devices is studied. Two types of FACTS devices, thyristor controlled series compensator (TCSC) and thyristor-controlled phase shifters (TCPS) are considered in this method. The specified power flow control constraints due to the use of FACTS devices are included in the OPF problem in addition to normal conventional constraints. The sensitivity analysis is carried out for the location of FACTS devices. This method provides an enhanced economic solution with the use of controllable FACTS devices. IEEE standard 30-bus system is taken and results have been compared with GA to show the feasibility and potential of this PSO approach.