This paper introduces a simplified but accurate enough annual energy loss evaluation method for branch circuits of a home and the like. The time-to-time and season-to-season changes in active and reactive power consumption for each appliance are considered. Considering that daily-load curves are quite different for weekdays and holidays, and also different for different seasons, sixteen daily-load curves are created to represent the daily power consumption characteristics for each kind of appliance, eight for daily active and another eight for reactive power consumption. Using only arithmetic calculations but considering the locations and characteristics of all connected appliances along the circuits of a home or building, makes the proposed method efficient and accurate enough. Accurate energy losses obtained by performing power flows for each time interval in the daily-load curves have demonstrated the correctness and efficiency of the proposed method. (C) 2010 Elsevier B.V. All rights reserved.