The main benefit of solar compared to using coal or other polluting sources is the reduced Green House Gas emissions, less effect on the local water bodies, less affect on the coal mining etc. Extracting energy from sunlight reduces several such harmful effects which are otherwise involved when we produce energy from fossil fuels like coal, oil and gas. Many of these fossil fuels are exhaustible sources of energy and also their use leads to air pollution and increased global warming.

A cosumer cannot sell his/her electricity generated from his residential rooftop solar to any party other than the local electricity distribution company. Under the net-metering arrangement under the PM Surya Ghar the surplus energy is taken your power company and they also compensate it accordingly. However, in commercial projects, solar project developers earn money from solar projects. But usually to make money and profits from solar plants, you need to invest more and go through other formalities

The additional surplus solar energy produced in rooftop solar setups in a grid-connected rooftop solar system is given to your electricity distribution company. The total number of surplus units not used by you and sent to the grid is also adjusted in your bill. So for example 100 units of surplus solar energy is not used by you and was sent to the grid, the electricity company while generating your bill will reduce 100 units from your total energy that used from the grid.