Résumé : The Ocean has provided a new way in the quest for renewable energy. One potential source of energy is the tidal current. The objective of this paper is to carry out a review of systems for the recovery of tidal energy and its conversion into electricity which represents one of the most interesting renewable energy resources precisely Marines Current Turbine MCT. In the first part of this work, a comprehensive description of marine current is performed, in which the physics of tide, the marine current prediction and the tidal Current Kinetic energy extraction models are given. In the second part, a detailed assessment of various state of art MCT systems (horizontal axis, vertical axis, and oscillating Hydroplane Systems), along with their classification and qualitative comparison, is presented. In the last part of this work, an outline of direct-drive electrical generator topologies is sketched in order to identify suitable generator concepts for direct-drive MCT. The comparison of different generator systems in literature is discussed with the criteria based on the energy yield, cost, weight and maintenance problem.