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In page Ocean thermal energy conversion:

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Beneficial factors that should be taken into account include OTEC's lack of waste products and fuel consumption, the area in which it is available[citation needed] (often within 20° of the equator),[6] the geopolitical effects of petroleum dependence, compatibility with alternate forms of ocean power such as wave energy, tidal energy and methane hydrates, and supplemental uses for the seawater.[7]