According to an embodiment, the power supply forgetting detection device creates a power usage pattern by the power amount calculated from the past amount of power data in the consumer premises, whether the customer has to go out on the basis of said power usage pattern I have a go out judging section judges. Also, the power supply forgetting detection device embodiments, receives the current power amount data in the customer facility, when the customer by the road determining portion is determined to have to go out, the received power amount data Based on, and has a forgetting detection unit detects a forgetting of the power of the electrical equipment of the customer facility.
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