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The excitation system of the hydro unit is a static self-excitation system that uses thyristor rectifiers in a three-phase fully controllable bridge connection with a digital two-channel regulation system characterized by a very fast response (eng. high initial response ratio). The excitation system is powered by an excitation transformer connected to the busbars of the aggregate with a transmission ratio of 14.4/0.42 kV. The aim of this project is to show the characteristics of the old ABB UNITROL 5000 excitation system as well as the improvements obtained by installing the new ABB UNITROL 6000 excitation system of unit 1 at the Trebinje Hydroelectric Power Plant 1. The reconstruction of the excitation system was carried out as part of the regular annual overhaul of the hydroelectric power plant by representatives of the company "Advensys engineering" d.o.o. - Zagreb, through cooperation with the staff of the power plant. The basic scope of the system reconstruction consists of three units and includes the replacement of the control part of the excitation, the replacement of the excitation switch and the replacement of the excitation control panel.