http://www.ecotricity.co.uk/

notes

OTEC (ocena thermal energy conversion) using temperature gradients between surface water and deep water to generate electricity, with the posibilty of fresh water as a 'byproduct'

http://www.hawaii.gov/dbedt/ert/otec_hi.html

http://acre.murdoch.edu.au/ago/ocean/ocean.html

http://dsc.discovery.com/news/2008/02/07/raindrops-energy.html

see also;: Viridian Green, Solar Power, Pedal Power, Wind Power