Hydro generator design is a significant issue in terms of safety, efficiency, and energy production sustainability.One of the most crucial issues about design criteria is to satisfy the needs of the project's critical speed. In this work, the critical speed calculation of an 11 MW Hydro Power Plant was investigated with several design steps. Numerical solution methodologies were implemented using ARMD™. A generator design was developed, and the implementation of the rotor was carried out in Antalya, Turkey. Vibration and displacements of the hydro generator are adequate. The generator unit is active for 3 years and had never encountered runaway speeds. No critical speed or resonance speed is anticipated for the designed hydro generator unit.