This course is addressed to students eager to know more about renewable sources of thermal energy in the seas and oceans as well as in the coastal area. We will study the potential of ocean energy sources and processes of thermal energy conversion with widely used installations and equipment such as solar thermal panels and photovoltaic panels, cycles of solar electric conversion, hydrothermal (marine) heat pumps, the energy use of ocean or coastal biomass. Among the installations still in development, the cycles of OTEC (Ocean Thermal Energy Conversion) and osmotic (based on the difference in salinity) plants will be studied.