Abstract: As the nonrenewable energy sources is about to end, future of human energy needs is in renewable energy (solar, wind, hydro etc). Solar energy are using all over the globe at micro as well as utility scale. A wide variety of tools exist for the analysis and dimensioning of both Grid connected and stand-alone photovoltaic systems. System designers and installers use simpler tools for sizing the PV system. Mostly scientists and engineers typically use more involved simulation tools for optimization. In present study design, optimization of a grid connected solar power plant at commercial rooftop as well as on utility scale in INDIA is to be discussed. Design, simulation, Optimization is going on simulation facility like PVSYST.

Keywords: PVSYST, panel, tilt, field type.