Currently, renewable energy sources such as solar and wind energies are increasingly used in the Egyptian power system. However, the large-scale renewable energy source of the intermittent type requires better management with a proper understanding of the changing characteristics of the grid and its protection systems. Knowledge of the reliability of distribution networks is an important factor in system planning and operation for the development and improvement of power distribution systems. To achieve minimal interruptions in consumers' work, utilities must strive to improve reliability at a low cost. Most customer service outages are known to be caused by a malfunction in the distribution system. This article examines the impact of new national renewable energy projects in Egypt on the voltage profile and reliability indices of the Egyptian 500 kV power system. The Electrical Transient Analysis Program (ETAP) was used for investigations. © 2022 IEEE.