| Summary: | <p>It is very important to make forecasts to support future planning. In electricity field, for estimating the demand for electrical energy, there are several influential factors to be considered, e.g. economic growth, increased demand for electricity, and the capacity of power and electrical energy providers. The limited availability of data and variables causes the predictions made to be inaccurate. This paper focuses on the accuracy of forecasting with various numbers of variables to optimize the data held. The initial stage of this research is the division of clusters using the hierarchical clustering method to divide 24 administrative regions into 6 clusters, and to increase the accuracy of forecasting using principal component regression. Based on the results obtained, it can be seen that the MAPE values vary in each cluster. The use of 7 variables in forecasting, in general, shows better accuracy than the use of 6 or 5 variables. However, the difference between the number of these variables is narrow. In cluster 6, the MAPE value in 7 variables is 0.88% while in 5 variables the MAPE value is 0.91%. In cluster 1 and cluster 4, the use of 5 variables has a better value than the use of other variables. Thus, this model can be used and developed to do forecasting even though it uses limited data and variables.</p><p><strong>Keyword: </strong>Spatial Forecasting, Clustering, Principal Component Analysis</p><p><strong>JEL Clafissification</strong><strong>s</strong><strong>: </strong>C210, C25, C380</p><p>DOI: <a href="https://doi.org/10.32479/ijeep.11010">https://doi.org/10.32479/ijeep.11010</a></p>
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