Fig. 7 shows the MAPE of the conventional method (where the
AECB in educational facilities was established based on the electricity
consumption of the previous year) and the proposed method
(which were developed by combining SARIMA and ANN) for
determining the AECB by educational facility. First, if the conventional
method was used (i.e., application of the observed electricity consumption in the previous year (2010)), the MAPEs for elementary,
middle, and high schools were 1.84%, 1.23%, and 1.75%,
respectively. Second, if the proposed method was used (i.e., application
of the predicted electricity consumption using the hybrid
model), the MAPEs for all three types of educational facilities were
less than 0.3% (i.e., elementary school: 0.24%, middle school: 0.11%,
and high school: 0.19%). Thus, it has been proved that the proposed
method enables executives and managers in charge of budget
planning to establish the AECB in educational facilities more
accurately, compared to the conventional method.