Several cities and towns in the country are experiencing a substantial growth in their peak electricity demand. Municipal Corporations and the electricity utilities are finding it difficult to cope with this rapid rise in demand and as a result most of the cities/towns are facing severe electricity shortages. Various industries and commercial establishments e.g. Malls, Hotels, Hospitals, Nursing homes, institutions. organizations, industrial, commercial & residential complexes developed by the builders and developers in cities and towns use diesel generators for back-up power even during the day time. These generators capacities vary from a few kilowatts to a couple of MWs. To meet with the increasing demand for power, Solar Photovoltaic Power Plant (SPV) is being proposed now a day. In order to utilize the existing roof space of buildings, it is recommended to promote roof-top SPV systems on buildings.