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In page Ocean thermal energy conversion:

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OTEC plants use very large flows of warm surface seawater and cold deep seawater to generate constant renewable power. The deep seawater is oxygen deficient and generally 20-40 times more nutrient rich (in nitrate and nitrite) than shallow seawater. When these plumes are mixed, they are slightly denser than the ambient seawater.[1] Though no large scale physical environmental testing of OTEC has been done, computer models have been developed to simulate the effect of OTEC plants.