The factors used in demand forecasts depend on the forecasting horizon. For very short-term demand forecasts, i.e., periods of 6 h or less, it is sufficient to use only historical data of the time series [13].
For instance, Huang and Shih [15] use a univariate time series model to forecast short-term electricity demand. Taylor [16] uses an exponential smoothing model to forecast up to one day ahead.