The Palace of Arts in Budapest provides space for smaller exhibitions, theatre rooms and for 3 bigger institutions. The quality of the electric energy of such a significant establishment on European level is an important question in the operation of the building. The determination of the required capacity, the consumption, the harmonics as well as the observation of the reactive and effective power and, nevertheless, recording the power disturbances make up a big part of the project. We chose the UMG 605, because it perfectly suits to the requirements of the network parameters determined by the Hungarian MSZ EN 50160 standard. Providing the right quality of electric power for the establishment is a key question for the operator because of the theatre and the TV broadcasts. In order to make analysis more precise the entire data are saved in a database. The communication between the monitoring station and the devices is carried out on the inside network via Ethernet port. The mobile device, which is developed by the Hunyadi Kft. and which is part of the project, makes the single measurements possible. JANITZA current transformers are included in the mobile device next to the UMG 605.