The current crisis of fossil energy is one of the major reasons that led to utilizing sustainable energy; on top of which is solar energy. The trend of new cities in Egypt is a major factor supporting such energies. Hence, active solar technologies varied greatly and spread in some local regions in the end of the 20^th  century. With the defect in the method of supplying cities with electrical energy, it became necessary to look for other systems or technologies of energy. Many types of technologies were developed, in addition to the emergence of new visions of handling them effectively and rapidly, on a global scale. As technologies became various and sophisticated, they have an obvious reflection on sustainable development of cities, in general, and new cities in particular. Starting from studying the local needs of active solar technologies, and describing the spatial study domain; this paper aims to explore the convenience  and the possibility of applying such technologies to New Assiut City; by comparing them in light of their technological and architectural requirements, and the urban needs of the city. Hence, the paper is started with the motives: the need for sustainable energy technologies – solar energy as a qualitative domain- to supply energy, because of the defect in the current approach. This is followed by a technical description of the major technologies reached so far, the requirements and the return of each technology. To achieve the aim of the research, New Assiut City was reviewed as a spatial domain of the study, together with the climatic features, design and urban determinants that affect the technologies being studied. Through this theoretical approach, the commutative relationship- between the technology requirements and the city needs- is being explored, by comparing them within the application axes in the city. Then,  the convenience and the possibility of applying such technologies to a city is deduced; which is the aim of the study. The paper is ended with a discussion of the role of the selected solar technologies, their contribution and the possibility of application to the city being studied; with determining the challenges to activating such technologies.