Current global efforts to decarbonize the generation of electricity are mainly focused on the use of renewable resources such as wind and solar, and due to this less attention tends to be paid to energy generation utilizing waves and tides. This tendency is based primarily on the difficulty that arises due to the medium of the marine environment, which adds complications to the design, construction, and operation of generation units on the sea in comparison with the onshore cases.

However, these difficulties have not prevented engineers from taking advantage of the huge potential that the marine environment presents for the generation of clean energy. An example of this is the construction and operation of offshore wind farms and the design and construction of novel wave and tidal devices in recent years. These marine power plants have provided valuable insights for the industrial community and researchers into renewable marine energy systems. However, there is still a lot of room for improvement for a correct and efficient exploitation of these types of installations.

This special issue aims to bring together contributions from researchers working in the field of marine (offshore wind, wave, and tidal) renewable energy systems, in order to outline the current state of the art and highlight the emerging trends and challenges in this field, ranging from mathematical modelling to methodological aspects. Both high-quality original research and review papers are welcome.

Potential topics include but are not limited to the following:

• Robotics and control algorithms for marine renewable energy systems
• Signal processing algorithms for marine renewable energy systems
• Mathematical modelling of marine renewable energy conversion systems
• Mathematical modelling of renewable energy resources (waves, tides, and offshore wind)
• Risk and reliability mathematical models for marine renewable energy systems

Business mathematical models including Levelized Cost of Electricity (LCOE) projections for marine renewable energy systems