Electricity transmission systems are crucial for contemporary societies, as they ease the use of overhead power lines supported by transmission towers. These towers are engineered to fulfill both electrical and structural demands, considering factors like conductor weight, environmental impacts such as wind and earthquake loads, and potential extraordinary stresses such as cable breakage. However, due to the prevailing belief that transmission line towers are not highly susceptible to earthquakes, seismic considerations have often been overlooked in their design and analysis. This study addresses this gap by evaluating the seismic performance of TL towers. The primary goals are: (i) to find any structural weaknesses for different conditions accounting nonuniform span, cable breakage, and cable breakage along with some bracings broken that may compromise its safety, and (ii) to provide practical recommendations for improving the seismic performance of such power transmission. The research involved creating a finite element model of a typical transmission tower and analyzing it with data from recorded earthquake ground movements. A four-legged square transmission line tower, seismic zone five in India at a height of 21 m, was analyzed using finite element (FE) software.