A Time of Day Energy meter or a Time of Usage Energy meter is an Energy meter which measures the energy consumed and also the time of day it was consumed.
The time of day energy meter, is used in many countries where the consumer is charged based on the time of the day the power was consumed. The Time of Day Energy meter gives it output in the form of slabs with the energy units and the time. The utility then applies the cost per unit depending on the time and the customer gets the final bill.
The Time of day helps encourage customers to use power during the off-peak hours. It is also used in Power wheeling in which private power producers use the transmission lines of a utility to transfer power.