<p>A tidal current energy converter generates electricity using a rotor with blades and a generator, harnessing the kinetic energy of tidal currents caused by tidal phenomena. Similar to a wind turbine, it drives a turbine using the flow of a working fluid. However, unlike wind turbines, whose power output is hard to predict, tidal current energy converters utilize the periodic flow of seawater, enabling consistent power generation and accurate long-term predictions. This study involved flow and integrated load analyses for the preliminary design of a 1 MW tidal current energy converter. A 3D Reynolds -averaged Navier-Stokes (RANS) analysis was conducted to assess flow characteristics, employing The shear stress transport (SST) turbulence model with tetrahedral and hexahedral computational grids. Additionally, integrated load analysis using Tidal Bladed examined the power performance and load characteristics of the 1 MW converter. A full-scale converter was installed in the Uldolmok Strait, and its power performance was evaluated. The power coefficients were determined to be 33 % from numerical analysis and 29.2 % from field tests.</p>