For Brabant and Noord, the results of the time series model are given in Table 9 and Figs. 6e8 below. The average percentage errors of the forecast for 2010 are 3.32% for Brabant and 3.63% for Noord grids. In this case, the maximum absolute errors are significantly reduced compared to the regression model. However, this model does not outperform the regression model, since the average percentage error is larger in this case. The advantage of the time series model is that the maximum errors are smaller, due to the smoothing effect, as can be seen in Table 9. In this case, the maximum error is slightly above 20%.