salt water and fresh water, seperated by a membrane can turn turbine

only fresh water can move through membrane, forward osmosis, this increases pressure on salt water side, turning turbine
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(excellent technology for Alaska and British Columbia)


First osmosis power plant goes on stream in Norway 16:50 26 November 2009
"The world's first prototype came on stream this week. Sited on the banks of the Oslo fjord in southern Norway, it generates electricity using the natural process that keeps plants standing upright and the cells of our own bodies swollen, rigid and hydrated. Osmosis occurs wherever two solutions of different concentrations meet at a semipermeable membrane. The spontaneous passage of water from dilute to concentrated solutions through the membrane generates a pressure difference that can be harnessed to generate power."

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Ancient carpentry level -- a hose with water in it -- water levels match-up -- add salt, changes gradient and tensile pressure, pushing out fresh water from hose. Alternative, Ocean water pump technology allows alternative approaches to mixing salt and fresh.water. Ocean water, land water divide. http://www.ecogeek.org/component/content/article/2301