Control device, control system, control method and program

A control device comprising:

• a controller configured to,
• when a prediction value of an electricity fee is greater than a target value of an electricity fee and a difference between the prediction value and the target value is less than a first threshold, execute either one control of an electric power saving control for electric equipment and a charge-discharge control in which electric power supplied from the commercial electric power source is stored in a storage battery in a first time slot and the electric power stored in the storage battery is supplied to the electric equipment in a second time slot in which a unit cost of the electric power supplied from the commercial electric power source is greater than that in the first time slot, and
• when the prediction value is greater than the target value and the difference is greater than the first threshold, execute the electric power saving control and the charge-discharge control.

A control method comprising:

• selecting, as a first-stage control, either one control of an electric power saving control for electric equipment and a charge-discharge control in which electric power supplied from a commercial electric power source is stored in a storage battery in a first time slot and the electric power stored in the storage battery is supplied to the electric equipment in a second time slot in which a unit cost of the electric power supplied from the commercial electric power source is greater than that in the first time slot;
• and
• executing the first-stage control, when a prediction value of an electricity fee is greater than a target value of an electricity fee.

A non-transitory computer-readable recording medium storing a program for causing a computer to function as:

• a selector configured to select, as a first-stage control, either one control of an electric power saving control for electric equipment and a charge-discharge control in which electric power supplied from a commercial electric power source is stored in a storage battery in a first time slot and the electric power stored in the storage battery is supplied to the electric equipment in a second time slot in which a unit cost of the electric power supplied from the commercial electric power source is greater than that in the first time slot;
• and
• a controller configured to execute the first-stage control selected by the selector, when the prediction value of an electricity fee is greater than a target value of an electricity fee.