PM Surya Ghar: Muft Bijli Yojana (PMSGMBY): Households will have access to collateral-free, low-interest loans at around 7% interest for the installation of residential rooftop solar (RTS) systems up to 3 kW. PM Surya Ghar: Muft Bijli Yojana (PMSGMBY): Households will have access to collateral-free, low-interest loans at around 7% interest for the installation of residential rooftop solar (RTS) systems up to 3 kW. Zee News :Business