In case your state gives you additional subsidies, you will get it after the final procudure done at the PM Surya Ghar Portal (National Rooftop Portal). After your final connections and all formalities are done, MNRE and states disburse your subsiies within one month. There is no need for any extra application to get state subsidies.

If you want to apply for residential rooftop solar project and live anywhere in India, you are entitled for a central govt subsidy of Rs 78,000/- if you are planning a project of upto 3kW or more. However, in case your state gives you additional susbsidy, you can get more. For example, a UP resident for a 3kW system can get Rs 78,000/- from MNRE and Rs 30,000/- from UPNEDA (UP govt). So, in total you will get Rs 1,08,000/- for a 3kW system or a system more than 3kW. It is because there is a ceiling for connections after 3kW.