The existing production systems of renewable energy from fluid flows are either hydropower or wind power. They can take many forms such as the wind turbine and the tidal turbine for example.

These methods, in order to ensure high levels of performance, must always face severe conditions of service.

The unpredictable and sometimes quite violent characters of the nature, added to the outfits variable intensities and directions of ocean currents or air currents, are directly impacting the design of the conversion systems, by making it inevitably more complex.

This complexity, subsequently lead to the amplification of investments needed to convert these forces to useful energy.

Our aim objective trough this special issue, is to explore innovative techniques and methods that can contribute to the development of renewable energy, especially based on the wind-generated waves and the solitons phenomena. Tow parameters must be taken in consideration: the technical efficacy and the economical efficiency.