Power flow control techniques have been practiced, from using inductors, capacitors, transformers and load tap changers in the earlier days of electrical engineering to power electronics-based solutions in recent years. Even though the costs and complexities of the available solutions vary widely, the basic underlying theory of power flow control is still the same as it has always been. The question is which solution one should employ. The answer depends on knowing what the true need is. The power industry’s pressing need for the most economical ways to transfer bulk power along a desired path may be met by building new transmission lines, which is a long and costly process. Alternatively, it may be quicker and cheaper to utilize the existing transmission lines more efficiently. The key is to identify the underutilized transmission lines and harness their dormant capacities to increase the power flows to the lines’ thermal limits using the most cost-effective and time-tested solutions. Also, the grid congestion can be mitigated by holding the power flow in a line at its limit, instead of tripping the line and possibly initiating a cascaded failure of the grid, resulting in a blackout. The presentation is designed to provide the basic principles of power flow control theory, an overview of the most commonly used power flow controllers, and future trends. The first commercial-grade Sen Transformer is designed, manufactured, and tested. The test results are as always expected. The audience will hear from an expert who actually designed and commissioned a number of power electronics-based FACTS controllers since their inceptions in the 1990s. Co-sponsored by: Syed Ahmad Speaker(s): Dr. Sen Virtual: https://events.vtools.ieee.org/m/472231