Non-technical losses shatter economy of distribution utilities causing financial loss. Network oriented methods of non-technical electricity losses detection and localizationprovide detection costs reduction. Compared with data-oriented methods focused on power consumption profile anomaly detection, network-oriented methods are able to localize non-technical losses invariably due to their relevance with electrical energy balance based on metered values. Depending on calculation procedure, network-oriented methods can be subdivided to the steady state calculation methods and state estimation methods. The paper demonstrates that state estimation methods provide more accurate non-technical losses calculation and localization compared with steady state calculation methods.