The power generator system generally consists of equipment to generate electricity, control systems, and monitoring systems. The monitoring system is usually located in a control room, which is located quite far from the generating equipment, so many use SCADA (Supervisory Control and Data Acquisition) as a solution for this. Design of a prototype monitoring system for synchronization of generators to the PLN line was carried out on a SCADA-based MHPP (Mini-Hydro Power Plant). The SCADA system presents data in the form of graphs and writings whose values are in the form of data from GPC-3 Hydro and PLC. The protocol used for communication is Modbus TCP/IP. The results of the tests that have been carried out prove that the created SCADA system is capable of monitoring RTU data from both GPC-3 Hydro and PLC in real-time while the generator is operating. The indicator is the suitability of data values between SCADA and Modbus which is connected to GPC-3 Hydro and PLC and is supported by the suitability of the time values recorded in the alarm table data and graphs.
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