“1 lakh rooftop solar installations every 6 days”: Union Minister Prahlad Joshi says PM Surya Ghar scheme has become “mass movement”. Lakh Rooftop Solar Installations Every 6 Days, Says Union Minister Prahlad Joshi - New Delhi [India]: The 'PM Surya Ghar: Muft Bijli Yojana' has transformed into a widespread public movement,.