Solar power plants are most often connected to the distribution system, and their use leads to a load on the power grid in terms of voltage stability, frequency stability, voltage harmonics, etc. This thesis examines the values of the electricity quality parameters of the FESB solar power plant, in order to determine whether the parameters are within the permitted limits prescribed by the Croatian standard HRN EN 50160 and the Grid Rules of the Distribution System. The second chapter describes in general terms the quality of electricity defined by the HRN EN 50160 standard and the Grid Rules imposed by the distribution system operator. Electricity parameters are important indicators that determine its quality. In the event that one or more parameters are not met, and the most common cause may be the consumer, the power system is subject to a disturbance or/and system breakdown, and therefore the third chapter describes in detail the electricity quality parameters that need to be aligned with the HRN EN 50160 standard. The fourth chapter describes the FLUKE 435 device, the parts of which it consists of, and the function for using the device. In the last chapter, the values of the parameters of the FESB solar power plant were tested using the FLUKE 435 device. First, the design of the FESB solar power plant was described, and then the testing of the mentioned parameters was started. Indicative values of the parameters were obtained, which were graphically displayed and subsequently used to approach the analysis of the quality of electricity, in accordance with standards and regulations.