FACTS include a portfolio with controllable devices that can relieve congestions and improve the efficiency of the existing network. The exact type to be selected is determined by the nature of the bottleneck. There are often different options. The application of corrective control will in many cases benefit from the application of advanced information and control systems customized for the particular bottleneck. It is important that operation planning is provided with efficient security assessment tools such that full advantage can be taken of the installations. This is in particular important when handling congestions on the interface between different systems.