Integrating floating solar photovoltaic (PV) systems with wireless power transfer (WPT) charging stations represents a cutting-edge advancement in smart city infrastructure, this approach eliminates the need for conventional plug-in methods and helps reduce carbon emissions. It offers a sustainable solution for powering Autonomous Underwater Vehicles (AUVs) in urban aquatic settings, reduce dependence on the power grid and minimize environmental impact. This chapter highlight the potential of this integrated renewable energy system to revolutionize urban aquatic management, improve the quality of urban life, and promote sustainable practices within smart city frameworks. The findings advocate for further exploration of this innovative solution to maximize the benefits of autonomous marine technologies improving the overall quality of urban life in smart city. 3 kW UWPT system was implemented with series series compensation topology with the coupling coefficient of 0.2 to attain efficiency over 96%. SS compensation and buck converter is implemented to provide constant voltage charging method to charge the AUV battery with 60% SOC. Simulation outcomes validated the theoretical analysis of the proposed method.