1 ن الرحيم ه الرحم بسمن الرحيم ه الرحم بسم Evaluating the Central Electricity Grid System in Comparison with Decentralized Solar Panels for Residential Power Supply in Egypt Prof. Dr. Hani Sa'ad Professor of Architecture in Al-Azhar University Eng. Hala Mohamed Raslan Assistant Lecturer in Beheira High Institute for Engineering and Technology Abstract: The rapid population growth in Egypt has resulted in a large escalation of demand for new settlements out of the old valley. The main obstacle in establishing new settlements is the absence of infrastructure. Installing the traditional central electricity grid systems demands huge capitals and investments which exceed the abilities of the Egyptian economy. Electricity is also a problem in existing populated areas which suffer either the expensiveness or the cutoffs of electricity, especially in hot summer months. This paper suggests that decentralized, self installed solar power supply can help providing cheap, clean and sustainable power resources for both populated and isolated areas. It is found that decentralized solar energy system is cheaper, more sustainable than centralized systems. This can help improving the quality of life in Egyptian cities and help expanding into new communities in the Egyptian desert. 1. Introduction : Electricity is the main key for any desired social or economical development. Recently it became a problematic issue in Egypt because of the shortage of fuel required for its generation. Electricity expensiveness and recurrent cutoffs are also a problem which affected Egypt's social, economical and even political life. The centralized traditional electricity grid is unable to expand to every house in Egypt and is also expensive and polluting the environment. So, we study the feasibility of using decentralized solar power systems in the Egyptian urban, rural and desert