Table II shows an example of the energy-limit control table, in which the field of the ‘‘accumulated energy consumed of the last 4 weeks’’ is the actual amount of accumulated energy consumption in the last 4 weeks, and the field of the ‘‘userdefined total energy limit’’ is the expected energy consumption of the following 28 days which is 94% (=380/404.36) of accumulated energy in the last 4 weeks. The rows of weekday average and weekend average are, respectively, the average energy consumption in a weekday and in Saturday or Sunday during the past 4 weeks.