Lightning Surge Analysis is one of major interest for electric utility companies. Particularly, for tall structure as EHV or UHV double-circuit towers, the surge characteristics become more dominant owing to the longer round-trip time of a traveling wave in the tower. In this book, the analysis of surge response have been carried out in the several arrangements. In all cases, the voltage measuring wire is placed at the perpendicular to the current lead wire. Each of the arrangement of the current lead wire affects the measured surge impedance of the vertical conductor and that has been explained details in this book. For the accurate analysis of lightning surge the Numerical Electromagnetic Code based on the Method of Moments is chosen, since it has been widely and successfully used in analyzing a tower system. Finally, this book presents some critical analysis concerning the simulation of electromagnetic transient in transmission lines caused by direct and indirect strikes of lightning, which will help the students, researcher and as well as relevant company to design the tower structure and protective device to protect various electric appliances that is used in our everyday life