In recent years, the need for efficient and reliable power supply management has become increasingly important. Power fluctuations, such as overvoltage and undervoltage conditions, can significantly impact the performance and lifespan of electrical appliances and equipment. To address this issue, this project proposes a GSM-based overvoltage and undervoltage monitoring system using Arduino Uno. The researchers analyze and examine the monitoring system in a panelboard and aim in the following (1) calculation of the accuracy level of the system readings compared to the multimeter reading of the panel board, (2) assessment of the relationship between the connected loads and the voltage variation in the panelboard, (3) store locally of the data gathered in the panel board, (4) comparison of correlation of the GSM module and Data logger. The prototype has been installed in two settings mainly the College of Engineering and Information Technology Electrical Room and Electrical Engineering Laboratory, and observed the voltage and current of the panelboard for 7 days to acquire the necessary datato parameters. Based on the data gathered the researcher determine conduct a GSM test and set a value of overvoltage to greater than 210 V and undervoltage with a value of 207 V and below to check if the GSM work properly. Furthermore, the accuracy level of the voltages and current by comparing the measured data of the prototype to manual measurements of the multimeter. Comparison between the stored data in the SD card and the SMS sent by the GSM were also assessed to examine the correlation between the two variables. Voltage and Current Variation were determined by using a system with a motor loadand with a neutral load. Lastly, advantages and disadvantages of the monitoring system compared to manual operation were tabulated to assess the cost benefit analysis.