Reuters - Tue Mar 18, 2008 8:49pm EDT
By Alister Doyle, Environment Correspondent
TOFTE, Norway (Reuters) - Only up to powering light bulbs so far, "salt power" is a tantalizing if distant prospect as high oil prices make alternative energy sources look more economical.
Two tiny projects to mix sea and river water -- one by the fjord south of Oslo, the other at a Dutch seaside lake -- are due on stream this year and may point to a new source of clean energy in estuaries from the Mississippi to the Yangtze.
The experiments, which seek to capture the energy released when fresh and salt water are mixed, build on knowledge that has been around for centuries -- in one case imitating the process of osmosis used by trees to suck water from their roots.
Although they are far from being economically viable, if eventually successful they might help a long-term quest to diversify away from fossil fuels such as coal and oil, widely blamed for stoking global warming.
"We might well be able to find new promising solutions such as generating power naturally from osmotic forces occurring when salt and fresh water are mixing," Norwegian deputy Energy Minister Liv Monica Stubholt said in a speech earlier this month.
And rivers flow around the clock, an advantage compared to variable wind or solar power.
continues...
http://www.reuters.com/article/environm ... 0520080319
Salt could shake up world energy supply
Sustainable and renewable energy.
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