Abstract: Photovoltaic is a technical term for generating electricity from light. In the present day scenario of electricity generation, it is fast becoming an important industrial product. Presently the PV market is dominated by wafer based crystalline Si cells, but is hampered by high cost. Nanotechnology is worldwide regarded as a key technology for innovations and technological progress in almost all branches of economy. The paper presents the designing of PV system for a commercial organization to meet its load demand with conventional solar cell and nano solar cell. Moreover, the cost comparison of conventional PV system and nano PV system carried out in this paper shows the superiority of nano solar cells over others in terms of cost and efficiency.