OTEC is ocean thermal energy conversion. It is related to geothermal but can be used on 3/4s of the earth's surface. (much better) It takes the energy difference of surface water and deep water to create hot and cold places that power a heat engine. The sun supplies energy to this by heating the ocean saltwater. Lots of times an ammonia boiler is used but Stirling engines would also work.
http://www.otecnews.org/
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