Industry growth, increased power consumption, the installation of new feeders, and the extension of existing feeder lines have all contributed to an extraordinary increase in electrical energy demand at the Debre Birhan substation. The transmission line from Legetafo to Debre Birhan has a primary voltage of 230 kV and a current of 800 A. The transmission line's rating is around 184 MVA. Over the last year, the transmission line from Legetafo to Debre Birhan has had an average peak line load of 159.4 MW. There are several methods for increasing the transmission line's power transfer capacity. TCSC is the first among them. The Thyristor-Controlled Series Capacitor (TCSC) is a series compensator that is used in transmission lines to control the active power flow, increase net transferable power, reduce losses, and Instead of building new transmission lines, lower costs. In this thesis, the design and analysis of TCSC have been implemented and tested to increase the net transferable power. This work was done on a 230 KV double-circuit transmission line from Legetafo to Debre Birhan. The degree of series compensation is typically 30 % to 70%, and in this thesis, 70% of the line reactance is chosen for compensation. A separate fuzzy logic controller is used in each operating mode to control the firing angle of the TCSC. The TCSC's analysis and design were based on two scenarios. The first scenario involves placing TCSC at the sending end of the transmission line, while the second scenario involves placing TCSC at the receiving end of the transmission line. The TCSC capacitive modes are performed in both scenarios. When the TCSC is placed at the transmission line's sending end in capacitive mode, the active power flow increases from 140 MW to 180 MW, while the reactive power flow decreases from 74 MVAr to 20 MVAr. The total apparent power is 181 MVA. When the TCSC is placed at the receiving end of the transmission line in capacitive mode, the active power flow increases from 140 MW to 200 MW, while the reactive components fall from 74 MVAr to 10 MVAr, resulting in a total apparent power of 200.25 MVA. The results are better when TCSC is placed at the receiving end of the transmission line. The overall cost, including the installation cost of TCSC and the cost of the TCSC devices, is 76,294,400 ETB. The net annual return of the devices after installation is 466,207,200 ETB. The payback period of the devices is 2 years. Keywords: Thyristor Controlled Series Capacitor, Power Flow, ANN, Fuzzy Logic Controller, MATLAB/SIMULINK