POWER MONITORING SYSTEM

PROBLEM TO BE SOLVED: To provide a power monitoring system capable of reducing an electric power charge.SOLUTION: A monitoring server includes cumulative actual usage calculation means for calculating a cumulative actual usage of power used during a period from a starting point to a predetermined point in a power charge calculation period, cumulative actual usage determination means for determining whether or not the cumulative actual usage to the predetermined point exceeds a target value, after the predetermined point in the power charge calculation period, and target usage alert generation means for generating a target usage alert that the cumulative actual usage to the predetermined point exceeds the target value when the cumulative actual usage determination means determines the cumulative actual usage exceeds the target value. Determination by the cumulative actual usage determination means takes place after the lapse of the first period in the power charge calculation period, and after the lapse of the second period after the lapse of the first period in the power charge calculation period. The second period is set shorter than the first period.