A wind farm consists of groups of wind turbines that have the task of generating electricity using wind. The wind turns the wind turbine from which mechanical energy is obtained by conversion, and through the generator we get the desired conversion from mechanical to electrical energy. In this final paper, the parts of wind farms, its working principle and types of wind farms were defined and explained, as well as the main part of the task: an overview of the Croatian power system that has technical requirements for connecting wind farms to the transmission network. The processed relevant determinants related to the connection of new users to the transmission network were analyzed from the documents Network Rules of the Transmission System and Rules on Connection to the Transmission Network. From the documents, we analyzed the process and the amount of documents that must be obtained in connection with the construction, and the preparation of individual studies to the various influences that we must adhere to when connecting with regard to frequency, voltage, etc.