Thyristor controlled series capacitor (TCSC), the first generation of flexible AC transmission system (FACTS), can control the line impedance through the series introduction of a thyristor controlled reactor across a fixed capacitor with the transmission line. Application of TCSC controller is to control the power flow, to damp out the power oscillations or to improve the transient stability. This paper concentrates only on power flow control over the transmission line using TCSC device. A 3 phase 400 kV Kalpakam and Khammam transmission line is considered for this analysis. Results are analyzed for sudden increase in load for cases without and with implementing TCSC controllers. The complete system is modeled in MATLAB/SIMULINK platform. © 2013 IEEE.