Osmotic power
By Hans Nilsson / Published on Fri, 2006-10-06 05:56Statkraft in Norway has, for some time, developed concepts for osmotic power, i.e. the power from the differences in pressure between salt seawater and sweet freshwater, the latter passing through a membrane (see figure below).
The potential is far from negligble. The Norwegians estimate their potential to be 12-25 TWh annually corresponding to 10-20% of their present generation capacity. For Europe, they estimate it to be 200-250 TWh, according to an article in the Swedish magazine ERA.
The same source says that they have managed to boost the membrane capacity from 0.1 W/sqm to 2 W/sqm, and that they aim for 5. The membranes are said to be produced in the Netherlands where there is also a similar idea developed within a project called Wetsus.
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