Chi-Chi earthquake in Taiwan and the Wenchuan earthquake in China are listed among the earthquakesrnwhich cause collapse of transmission tower. Currently, in Ethiopia, there is an electric transmissionrntower under construction on earthquake prone area, Wolaita Sodo. This transmission tower is expectedrnto carry electric current up to Kenya. Considering the effects that are going to be incurred if foundationrnfailure occurs, analyzing the effect of seismic loading will be vital for this project and furtherrnconstructions.rnIn this thesis, a 3D FEM analysis using ABAQUS software was performed to study the lateralrndeflection of the foundation of the above mentioned electric transmission tower using a singlernpile subjected to dynamic loading. 15 m long pile with varying diameters of 0.8 m and 0.6 m, keepingrnother parameters constant has been considered.rnFor the seismic loading, probabilistic seismic hazard analysis (PSHA) has been performed for thernspecified area. Peak ground acceleration of 0.16 g and 0.233 g has been obtained from the seismic hazardrnanalysis for design basis earthquake and Maximum considered earthquake respectively. Accelerationrntime history data has been obtained from PEER ground motion database.rnLayered soil with Mohor-Coulomb soil model has been used. To consider the continuity of the ground,rnthe infinite boundary has been used. Scaled acceleration time history has been applied at the base of thernmodel.rnThe dynamic response of the piles resulted in deflections of 72.02 mm and 63.7 mm for 0.6 m and 0.8rnm diameter piles respectively, which exceed the acceptable limits of recommendations. Increased pilernsize shows reduction in deflection and increment on soil resistance. The displacement of the pile whilerngoing from top to end shows reduction and this result agrees with literatures.