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Recently, many industries are using Supervisory Control and Data Acquisition (SCADA), especially in the electrical industry. SCADA system is a computer based in control and monitoring system. This research is proposed to design a Human Machine Interface (HMI) on the SCADA system for power plant. However, due to the high cost of HMI as used in the industry, a simulator HMI was built. The objective of this study is to design HMI simulator by using Visual Basic to simulate controlling process as similar as in the real plant. The strategy to examine the performance of HMI simulator is manipulates data from analogue data contained in a three-phase plant simulator and converted into the real SCADA scale and displayed. Based on the experiment, the performance of HMI simulator is following what it should be, where the entered data from the RTU to the HMI is running well and can displayed on a computer.