Financial impact of penalties applied to Brazilian energy distribution companies by exceeded of the limits of performance of power supply continuity

The regulation of power quality in Brazil has had a number of changings and adjustments aiming at the continuous improvement in the quality of product and quality of service. Related to this issue, this paper presents an analysis of the methodologies currently applied to evaluate and define limits of performance of the quality of service provided from power utilities. From tables and graphs given is going to be assessed the financial impact caused by financial penalties applied for violation of limits of performance. This paper also presents a preliminary fuzzy modeling, which is used to obtain new limits of performance considering technical and operational aspects of distribution networks.