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Incident Energy is the energy released when an arc flash (electric arc) takes place in an electric panel. Arc-flash is a short circuit phenomena through the air that can possibly involve very high current or energy that can destroy anything around the spot. The incident energy is determined by the arc-flash current, the voltage, the distance between conductors (where the arc exists) and the duration of the arc-flash. However, this energy can endanger the safety of people working around the point of faults in the panel, especially technicians working for maintenance. Such events are still happened frequently in industries and many people become victims. Therefore, it must be anticipated and prevented to safe people working around and the panel itself. The aim of this paper is to examine arc-flash in a medium voltage utility panel at a power plant for safety reasons. In this paper the incident energy will be reviewed and analyzed based on standards and practical experiences and based on the results, the safety boundaries of the panel are calculated and the personal protective equipment (PPE) needed for the worker is determined. Therefore, by the application of these, the safety of people working around or close to the panel can be guaranteed. This study can also be used as a guidance for electrical engineer to examine or review the safe conditions of their electrical panels.