It really sounds cool to generate our own power and be absolutely independent of the grid, doesn’t it?

But hold on, not so fast.

For factories and commercial establishments, the feasibility to run entirely on rooftop solar is still lower, and should be considered only in the rarest of cases.

So, while it is unlikely that our homes or factories will run solely on rooftop solar power in the near future, here are some estimates on how much solar can supply.


  • Houses: Rooftop Solar Can Supply Most of Your Needs – For many houses, rooftop solar has the potential to contribute up to 80% of their total electricity consumption.
  • Offices & Commercial Establishments: 10-40% – For offices and commercial buildings, rooftop solar has the potential to contribute up to 40% of their electricity consumption. For an IT company in Chennai that Solar Mango assisted in implementing a rooftop solar power plant, the contribution from solar worked out close to 35%.
  • Factories & Manufacturing Units should not expect much from rooftop solar alone. For factories and other units that use heavy machineries and large amounts of electricity, the contribution from rooftop solar alone might be quite insignificant.
Consider the case of the pharma company that Solar Mango assisted. Even though they had a large rooftop area of 8,000 sq.m, the contribution of solar power from their rooftop worked out to less than 5% because of the massive power consumption by the factory – about 21,00,000 units per month!


As a commercial or industrial unit, you might be disappointed that you cannot get a majority of your electricity demand from rooftop solar.

But despair not. You can have solar contribute considerably more for your power demand by going beyond just your rooftop. This is what we deal with in Question 2.4.


Stuff to Remember

Rooftop solar power alone is unlikely to contribute all the power you need for your office or factory. For commercial facilities, it could contribute up to 40% in select cases. For factories with high power consumption, rooftop solar alone can contribute only less than 10% of total demand in most cases.