The reliability of the power system heavily depends on the ability to maintain frequency Stability, especially in regions like North Sulawesi and Gorontalo (Sulut-Go), which face dynamic load characteristics and the integration of fluctuating renewable energy sources. This study aims to evaluate the application of Automatic Generation Control (AGC) as a secondary frequency control solution to maintain the Stability of the Sulut-Go power system. In this study, several parameters are adjusted, including the B constant, Kp, and Ki values, where the use of a PI controller is preferred over a PID controller because the PI controller is more suitable for long-term control issues that commonly occur in AGC systems in power plants, unlike the PID controller, which is more sensitive to short-term disturbances and may cause undesirable fluctuations. Simulation results using the DIgSILENT PowerFactory software show that the application of AGC can improve system frequency affected by disturbances or load fluctuations. Based on the AGC parameter settings, the study found that setting the B_constant value to -4 (AGC 2) resulted in faster recovery time and better frequency Stability compared to other settings. Furthermore, simulations conducted without AGC showed that the system took a longer time to return to the nominal frequency of 50 Hz. The success of AGC in this system not only improves frequency Stability but also reduces the risk of outages due to power imbalance and load fluctuations. This study highlights the importance of adjusting AGC parameters to the local characteristics of the power system and the challenges posed by the integration of renewable energy plants. The findings are expected to serve as a technical foundation for the development of a more responsive and sustainable load control system in the energy transition era