www.elecon.ipp.pt 50 Towards Efficient European and Brazilian Electricity Markets First ELECON Workshop Institute of Engineering - Polytechnic of Porto, Porto, Portugal, September 24-25, 2013. Study of Proposed Identification of Non-Technical Losses of Electricity in Brazil Danilo Gastaldello a , André Nunes de Souza b , Tiago Forti b , Zita Vale c , Pedro Faria c a University os São Paulo (USP), São Paulo, Brazil b São Paulo State University (UNESP),São Paulo, Brazil c Polytechnic Institute of Porto (ISEP/IPP),Porto, Portugal Abstract The electric utilities have large revenue losses annually due to commercial losses, which are caused mainly by fraud on the part of consumers and faulty meters. Automatic detection of such losses where there is a complex problem, given the large number of consumers and the high cost of each inspection, not to mention the wear of the relationship between company and consumer. Given the above, this paper aims to briefly present some methodologies applied by utilities to identify consumer frauds. Keywords: Non-technical losses, identification and classification, electrical energy consumer 1. Introduction In the last years, the Brazilian system had many changes, passed the period of the privatization of the generation companies, transmission and distribution of electric energy, this results in the creation of a competitive market in the national scenario. The investments made by the private companies have with main aim a great improvement of theirs technical and financial performance, through more productivity, efficiency and profitability [1]. Commercial losses or non-techniques are those associated with marketing of the energy supplied to the user and refer to the energy delivered but not billed, generating a loss in the revenue. Are also defined as the difference between total losses and technical losses, and are mainly related to illegal connections in distribution system [2].