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The article deals with the modernization process of automated control system of operating process of boiler unit at South Kuzbas hydro electric power station. The boiler unit has been modernized through the installation of automated control system and control on hierarchical arrangement consisting of the levels where the tasks of input and ouput control signals are distributed. Controllers produced by Ram Company and sensors produced by Elemer company were used for modernization of boiler unit. Automatic and process control was made on the base of MicroSCADA software. It has been currently estimated that the use of automation system will result in decrease in fuel consumption by 1 % and reduce nitrogen oxide and carbon monoxide emission by 3 %. System payback time would be no more than two years.