Japanese electricity retail market is fully liberalized in April 2016. New entry electricity suppliers have started to supply electricity targeting hundreds or more of households and they need to plan supply and demand schedule in daily operation. However, there are not many studies which are subjected aggregated households’ electricity demand characteristics so that new entry electricity suppliers are not able to construct an accurate demand forecast model for daily operation. Therefore, this paper presents characteristics of households’ electricity demand targeting hundreds of households using about 700 households’ electricity demand. We evaluate electricity demand characteristics with different time span such as monthly, daily and hourly. We also evaluate electricity demand difference between weekday / weekend and holiday, or singularity in days such as a new year’s day or the bon festival season. We compare those characteristics with some of earlier studies to define generality of household’s data which we use. In addition, we calculate electricity demand fluctuation in different number of households to find out smoothing effect so that our data is large enough to define hundreds or more of households’ demand characteristics.
