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 those times during which a controllable load is disabled. Off-peak hours are those times during which a controllable load is allowed to operate. Anticipated (pre-peak) hours are those times during which ETS equipment can be prepared for an upcoming on-peak (control) period, or a time when power companies can apply customized control of the ETS equipment. If uncertain as to whether this option is being used in your area, contact your local power company representative.