The TidGen Power System generates emission-free electricity from tidal currents and connects directly into existing grids using smart grid technology. The power system consists of three major subsystems: shore-side power electronics, mooring system, and turbine generator unit (TGU) device. This submission includes the preliminary turbine hydrodynamic design, with supporting CFD analysis, structural analysis, and design description for TidGen versions 1.0 and 2.0.