According to GreenTech Media, Ocean Thermal Energy Conversion is after wave and tidal energies the third form of ocean power. Albeit it was discovered a century ago, there have been few attempts at tapping this energy source.
To Wikipedia, OTEC ” uses the temperature difference that exists between deep and shallow waters to run a heat engine. As with any heat engine, the greatest efficiency is produced with the largest temperaturedifference.”
If you are interested in more news on what seems a promising technology and energy source, please check out www.otecnews.org.