  This article presents a case study demonstrating a non-intrusive method for
the well-being monitoring of elderly people. It is based on our real-time
energy measurement system, which uses tiny beacons attached to electricity
meters. Four participants aged 67-82 years took part in our study. We observed
their electric power consumption for approx. a month, and then we analyzed
them, taking into account the participants' notes on their activities. We
created typical daily usage profiles for each participant and used anomaly
detection to find unusual energy consumption. We found out that real-time
energy measurement can give significant insight into someone's daily activities
and, consequently, bring invaluable information to caregivers about the
well-being of an elderly person, while being discreet and entirely
non-intrusive.
