The development of future generation computer systems based on approximate models of human thinking and their use is one of the main tasks of science today. The ability to make correct decisions in the face of incomplete and unclear information is the main property of human intelligence. However, to take into account various types of uncertainties that necessarily arise in the mathematical description of reality, it is necessary to use Fuzzy logic . This article presents a generalized method for assessing power quality indicators in distribution networks using fuzzy logic. This allows you to significantly expand the possibilities of taking into account fuzzy information and increase the accuracy of the assessment. In conditions of limited and unreliable information about processes, as well as incomplete and inaccurate knowledge and subjectivity, an effective solution to the problems of improving the transmission and distribution of electricity can be achieved through an approach that is based on comprehensive analysis and the use of modern technologies and methods.