This paper presents the steps taken to ensure the ilummination of the city of Cluj: with oil in 1827, based on gas in 1890 and finally the electrification project that began after 1904. There are rendered the steps taken in the development of electrical engineering in Transylvania, both by providing technical characteristics of the hydroelectric groups and generators used at different times, and by the descriptions of the solutions used in electricity generation and transmission. As well a significant contribution is played by the provided statistics on the growth rate of installed capacity requirements and also by the evolution of the demographic factor in Cluj area. It is highlighted the special contribution of Professor VASILESCU - CARPEN, rector of the Polytechnica University of Bucharest, in the development of the energetics in Cluj, as well as that of the local personalities who were part of the Joint Board of Administration, which provided management and distribution of electricity in Cluj. Living in the spirit of Central Europe many of its personalities brought significant contributions to the development of electrification in the area. The establishment of the Faculty of Electrotechnics in Cluj-Napoca is related to the name of Professor Liviu MANDUC, the paper presenting the stages of his career, and of that of the school of Cluj. Another personality, on which the authors insist upon is that of Professor Nicolae PATACHI, which is today at the venerable age of 92 years.