Renewable energies characteristically use a source of energy which is

supposed to be inexhaustible and not release CO₂. Therefore, they seem to

be ideal solutions to this dual issue of production 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.