[en] This report discusses methods of calculating loss costs in transmission grid systems and distribution networks in Norway and updates previous specific loss costs. For this updating, the stylized network on which the specific loss costs are calculated have been modified. The number of radial levels have been reduced by combining the 132 kV and the 66 (47) kV networks. In addition to reducing the number of main levels, it was decided to introduce a stronger differentiation at the distribution level. The principle of alternative loss costs at distribution level has been extended by introduction of a third alternative for distribution networks which concerns cable grids in regions of intermediate area load, in addition to cable grids with high area load and overhead cables. It is found that the loss costs have not changed much for the highest levels since 1992. For the distribution network, however, there is a considerable increase in loss costs. Networks containing energy-intensive industries are not considered. 14 refs., 19 figs., 41 tabs