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There appear to be several potentially viable ocean-based alternative energy technologies that do not rely on petroleum products and directly produce no air, water or solid waste emissions. In spite of these positive environmental considerations, each of the aforementioned technologies (wind, waves, tides) may have site-specific environmental considerations that should be thoroughly evaluated before a full-scale system is constructed. Most of these technologies, particularly those based on generating electric power from waves or tides, are in the early stages of commercial development and will likely go through the small demonstration project phase before any large-scale facilities are constructed. 

We would like to present  proposals to combine tidal and wind power and install tidal stream turbines on the bases of offshore wind turbines. The hybridization of wind and wave energy could enhance cost competitiveness with onshore wind facilities because of synergies that include single permitting; shared foundation/mooring infrastructure; shared deployment and operation maintenance with common facilities, equipment, and personnel; and higher capacity. However, marine-based renewable energy technologies.

W.M.S.T. Weerasinghe