This paper will show the hydro-electric power plant Dubrava's system and the way it works. Therefore, this paper, in its essence, is going through the technical details of the main parts of the turbine hall, the dam itself, process systems and the Operator's station. The emphasis of the paper is on the description of the systems that are necessary for the hydro-electric power plant to carry out its task. The work is divided into several sections. The introduction briefly describes the hydro-electric power plant Dubrava, its location, size and history of its construction. The second part describes the role of the command chain Varazdin that performs remote monitoring and management of hydro-electric power plants on the Drava with the aim of better utilization of water, and in accordance with the water management requirements in Croatia. Third section covers the basic technical specifications of the main parts of the turbine hall, such as the production units, operation, signalling of production unit and measurements. The fourth section provides an overview of key technical data of the main parts of the dam. The fifth section displays the process system of the hydro-electric power plant, and the sixth sections introduces the workings of the Operator's station. The seventh section deals with the list of events and alarms, and the eighth displays various inputs and outputs. It can be concluded that the hydro-electric power plant Dubrava is highly beneficial because it uses the potential of the Drava river to generate electricity. Further, it increases flood protection, improves drainage, enables gravitational irrigation of agricultural land and provides conditions for the development of sport and recreation.