Typically, power companies are capable of sending one signal for peak control of selected devices. There are some instances; however, where power companies are capable of sending multiple signals for control purposes. In these situations, it is possible to have on-peak hours, off-peak hours, and anticipated peak (pre-peak) hours.
On-peak hours are times during which a controllable load is disabled. Off-peak hours are times during which a controllable load is allowed to operate. Anticipated (pre-peak) hours are times during which ETS equipment can be prepared for an up coming on-peak (control) period, or a time when power companies can apply customized control of the ETS equipment.
Power companies selectively use anticipated peak (pre-peak) signals. If uncertain as to whether this option is being utilized in your area, contact your local power company representative.