Answer : 4. "From rooftop solar panels"
Explanation :

Recently PM Modi launched Pradhan Mantri Suryodaya Yojana. This is a centrally sponsored scheme, under which rooftop solar panels will be installed on more than 1 crore houses, with the help of which people will get a clean source of energy. The objective of this scheme launched by the Prime Minister is to include poor and middle class persons under the rooftop solar program. Also its objective is to bring self-reliance in the energy sector.