In certain places where utility power is unstable and unreliable, many buildings have adopted their own private generators as a backup power source to provide a continuous and uninterrupted power source.
Rental office buildings, high end residential buildings, rented factories and shopping centers.
To meet the needs of such a requirement, by necessity a system is created to bill for the utility power and generator power separately, as generator power is more expensive. Thus there is a need to register the power usage for both utility and generator power separately as well.