Growing concern over the threat of global climate change, and the ineluctable depletion of raw energy resources have led to an increased interest in research and development of renewable energy technologies. The ocean provides a wide potential energy resources, and as renewable energy technology develops, investment in ocean energy is likely to grow. Research in ocean thermal energy conversion, wave energy, tidal energy, and offshore wind energy has led to promising technologies. This paper aims to give an overview of the development of a design methodology of a production line based hydroliens connected to the electrical grid. We also present the principle of recovery of the energy of tidal currents by the turbines and the main component elements of the conversion chain of a hydroliens, a mechanical sensor (turbine), an electric generator, static converters and means of energy storage.