Renewable energies characteristically use a source of energy which is supposed to be inexhaustible and not release C02. Therefore, they seem to be ideal solutions to this dual issue of productio n and preservation of the environment. Some available energy sources are mechanical ocean energy which use marine currents or waves and hydropower energy using river currents. This report is a state of the art, including market and technologies potentially used to produce energy from currents and waves. A focus on regulation in France is proposed to complete the survey.