PM Surya Ghar Muft Bijli Yojana is now inviting applications to provide 300 units of free monthly electricity to 1 crore households. The Centre gives subsidies up to Rs 78,000 but it depends on the capacity of solar panels one installs. If the householder can't afford the remaining amount, he or she can get a loan from the bank. Rooftop solar PV systems can be installed on any type of roof having sufficient load-bearing capacity. On a clear sunny day, a 1 kW solar power plant can generate 4 to 5.5 units in a day.