Time of use (TOU) pricing is a billing practice of utility companies, in which differing costs per unit of usage or demand are applied to selected periods of the day.

TOU periods are broken into time based categories:

  • Super Peak A period of time where usage/demand is expected to be in excess of On Peak levels, utility companies place a premium cost on this usage/demand. An example of a Super Peak period is the early afternoon hours during the summer.

  • On Peak The period of time when usage/demand is at its maximum. Prices per unit of energy and demand for the On Peak period are typically high. The middle of the day during the week is a common On Peak period.

  • Mid Peak The periods of time when usage is significant, but less than maximum.  Energy/demand prices are higher than off-peak. Mid-peak periods typically occur between On Peak and Off Peak periods.

  • Off Peak The period of time when energy usage is expected to be at its minimum. Energy/demand prices are typically lowest for the off peak period. Examples of Off Peak periods are nights and weekends.

This option allows you to define costs on a time of use basis for Energy Charge and Demand Charge cost options. For example, if you do not select the Demand charge option (i.e. there are no demand charges) you will not be able to define TOU demand charges.

  1. In the Rate Wizard - Feature Selection page, select the Time of use pricing option.


  1. In the Rate Wizard - Time of Use Pricing page, select a TOU definition from the drop-down list.


By default, only TOU definitions associated with the selected vendor for the rate you are creating appear in the Time of use name list. It is recommended that you choose a TOU definition associated with the selected vendor as the necessary definitions have been previously defined for the rate you are creating.

    • If you wish to select another vendor's TOU definition, select the Show for all vendors option.

    • You can create a new TOU definition by clicking . The Create Time of Use dialog box appears. Follow the instructions for Creating a Time of Use Definition.

    • You can modify a TOU definition by selecting the appropriate definition from the drop-down list then clicking . The Time of Use Properties dialog box appears. Follow the instructions for Modifying a Time of Use Definition.

  1. Continue building the rate. The demand charge and energy charge will have TOU definition portions.



Select a billed demand calculation method option.

    • Each period individually This option tells the rate to calculate each TOU period's (On-Peak, Off-Peak, etc.) own cost and add it to the total demand cost. The recorded On-Peak period demand is multiplied by the cost per unit of On-Peak demand, and the recorded Off-Peak period demand is multiplied by the cost per unit of Off-Peak demand.

    • Period of maximum demand This option tells the rate that demand is not TOU dependant. In this case, the cost per unit of both On-Peak and Off-Peak demand should be set to the same value. The single highest peak demand reading, regardless of which period it occurred in, is used to calculate the demand cost.

    • Selected period This option allows you to tell the rate that only one peak period is to be evaluated. Select the appropriate peak period in the Period drop-down list. Only the period you choose is used to calculate demand costs.

  • Energy Charge

  • No labels