Abstract:
The purposes of this research were to 1) analyze electricity consumption of Pattaya City schools in 2012-2017, 2) to compare the performance and to analyze electricity consumption using the SARIMA model and the SARIMAX model, and 3) to forecast school electricity consumption for the 2018-2022 period. Data were the electricity consumption figures from January 2012 to December 2017. The SARIMA model was analyzed by using Minitab and the SARIMAX model was analyzed by using SPSS.
The results showed that 1) electricity consumption from January 2012 to December 2017 had an increasing trend in which September had the highest electricity consumption while April had the lowest, 2) the comparison of electricity consumption between SARIMA and SARIMAX models showed no difference, 3) the result of forecasting electricity consumption from January 2018 to December 2022 with SARIMA (0,1,1) (0,1,1)12 had an increasing trend. The forecast value of electricity consumption at the end of 2022 was approximately 4,137,752 kilowatt-hours, an increase from the year 2017 of approximately 193,341 kilowatt-hours per year. In September 2022, the maximum electricity consumption was approximately 431,315 kilowatt-hours, and April 2022 was the lowest was approximately 213,574 kilowatt-hours. The forecast estimates had Root Mean Squared Error (RMSE), Mean Absolute Percentage Error (MAPE) and Coefficient of Determination (R2) equal to 20091.242, 7.903, and 91.3 percent respectively.