Electricity forecasting contributes to have an idea of the electricity needs for the expansion of the electric system, the availability of the power plants according to the installed capacity and the way of the electric system operation. Therefore, this work studied the three time series approximations and their combinations considering two analyses: the first one considers different historical data baseline for the Brazil (SIN) and its subsystems to forecast the electricity demand from 2021 to 2025, then the percent error with EPE predictions are calculated for the same period. The second approach analysis the percent error of the electricity demand from 2014 to 2019, with the real historical data for the Brazil (SIN) and its subsystems. The results indicates that the Regression with Seasonality has the best approaches, and the combination of the time series methods helps to reduce the error of the approximations. In addition, choice of the historical data has an important role to have a better approach by time series analysis.

Energy, Vol. 247

Carlos E. Velasquez, Matheus Zocatelli, Fidellis B.G.L. Estanislau, Victor F. Castro

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