Ministry of New and Renewable Energy (MNRE) provides an online calculator to help consumers understand how much power can be generated based on the consumer's budget, or the expense required to install a certain solar panel capacity as per the available roof top area
"Solar Rooftop Installation Interest Form is made available online by Ministry of New & Renewable Energy (MNRE) to facilitate submission of interest, so that the Ministry representatives may contact for further guidance and installation"
Ministry of New and Renewable Energy (MNRE) provides an online list of agencies under Grid Connected Rooftop of Solar Photovoltaic across India, searchable by State & Agency type
It will help to get an estimate of installation of Small Power Plants using solar in your premise. It is a calculator for installing Solar Rooftop Power Plants based on your budget or space available or KW required.