The software EMTP is developed and commercialized by the EMTP Alliance. EMTP is a full-featured and technically advanced simulation and analysis professional software for power system transients. The package is a sophisticated computer program for the simulation of electromagnetic, electromechanical and control systems transients in multiphase electric power systems. EMTP is used worldwide as a reference tool by the main actors of the power system industry (EDF, RTE, Hydro-Québec and many others). It is suited for a wide variety of power system studies whether they relate to project, design and engineering, or to solving problems and unexplained failures. It’s capability to efficiently and quickly perform simulation of very large power systems, its numerical robustness and the stability of the simulation engine contribute to make of EMTP the reference for power systems transients. EMTP features a wide variety of modeling capabilities encompassing electromagnetic and electromechanical oscillations ranging in duration from microseconds to minutes.