There is a growing need for energy conservation through energy consumption in offices that have increased 40% from 1990 in Japan. Previously reported electric-power-consumption measurement systems are small for homes [1–3]. We have developed a practical system for a large-scale office. Simple and low power consumption smart power strip having a fail-free power measurement sensor was developed. System software on a server that collects power consumption data from smart power strip makes these visible to motivate user about energy conservation. A block diagram of the developed system is shown in Fig. 1.
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