Statkraft - Osmotic Power Plant - Free energy - How it works

Osmotic power is clean, renewable energy, with a global potential of 1600 to 1700 TWh - equal to China's total electricity consumption in 2002.
To find out more go to: http://www.statkraft.com/energy-sources/osmotic-power/

When freshwater meets saltwater, for example where a river flows out into the sea, enormous quantities of energy are released. This energy can be utilised to generate power through the natural phenomenon of osmosis.

Osmosis is the transport of water from an area with low concentration of dissolved substances (e.g. salt) through a membrane to an area with a higher concentration. The membrane is semi-permeable. It allows some substances to pass through, but stops other substances.
Nature will seek to equalise the difference in concentration between the two sides of the membrane. It is this mechanism which enables plants to absorb moisture through there leaves and retain it.
As water is drawn through the membrane one way only, a pressure is generated on the "inside", which in an osmotic power plant can be utilised to generate electricity.

To find out more go to:
http://www.statkraft.com/energy-sources/osmotic-power/

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[jayakarthigeyan]

is the water from the sea pumped up to the plant... and what kind of generators are used,

why so many pipes are required?

[gricka31]

@squige7854 no, you need a porous barrier which has holes big enough to let water through but small enough to not let salt ions through. osmosis occurs at a concentration gradient