Solar power systems are finite resources—they can only produce so much energy consistent with the size of the system, and most utilities limit system size to the historical energy usage average at the site.

How do solar panels affect electric bill?

Electricity Use However, with a home solar system, your electric bill only includes the number of kilowatt hours youve used from the grid. They dont add in any electricity used from your solar panels. So, if you only used power generated by your solar panels, the amount of electricity use on your bill would be zero.