Over the last two decades, electricity demand has increased substantially while the expansion of generation and transmission network has been limited due to environmental and/or economic constraints of building new generating plants and transmission lines. As a consequence, transmission lines are driven close to their transfer limits, and congestion often results. This paper proposes a method of locating series FACTS devices in a power system, with aim of alleviating congestion. Congestion rent is used to pinpoint lines suitable for TCSC placement. The proposed method is tested on the Western System Coordinating Council (WSCC) 9-bus test system, and results obtained show that locating FACTS devices optimally reduces the level of congestion in a power system