This study employs CFD to evaluate the efficiency of Savonius-type hydrokinetic turbines with both 2-blade and 4-blade configurations in submerged conditions. It focuses on investigating how the number of blades affects turbine efficiency and power production, utilizing advanced numerical simulations conducted via ANSYS software. Results indicate a clear superiority of the 2-blade configuration, demonstrating higher torque and power output compared to the 4-blade setup. Analysis of pressure and velocity contours elucidates flow dynamics and pressure distribution around turbine blades, emphasizing the pivotal role of blade count in turbine behaviour. This research yields valuable insights into optimisation of turbine design, thereby advancing the development of sustainable energy generation technologies. Understanding the performance nuances of Savonius turbines holds significant implications for enhancing energy generation efficiency in underwater environments, contributing to the broader realm of renewable energy applications.