This paper is a review of literature with an analysis on a selection of scienti c
studies for detection of non-technical losses. Non-technical losses occurring
in the electric grid at level of transmission or of distribution have negative impact on economies, affecting utilities, paying consumers and states.
The paper is concerned with the lines of research pursued, the main techniques
used and the limitations on current solutions. Also, a typology for
the categorization of solutions for detection of non-technical losses is proposed and the sources and possible attack/vulnerability points are identifi ed. The selected literature covers a wide range of solutions associated with
non-technical losses. Of the 103 selected studies, 6 are theoretical, 25 propose
hardware solutions and 72 propose non-hardware solutions. Data based
classi cation models and data from consumption with high resolution are
respectively required in about 47% and 35% of the reported solutions. Available
solutions cover a wide range of cases, with the main limitation found being the lack of an uni ed solution, which enables the detection of all kinds of non-technical losses
