When Freshwater Meets Seawater, Look Out!

by Robert Williams, Publisher
Friday, October 9, 2009

Get this. Energy is now being generated from the collision of seawater and river water. It’s called osmotic power. And the world’s very first plant to generate such power is expected to open next month at Tofte, outside of Oslo by Norway’s state-owned electricity company, Statkraft.

It’s ingenious. The power is generated by energy retrieved from the difference in the salt concentration between seawater and river water.

How’s it work?

Both components – saltwater and freshwater – are funneled into separate chambers, divided by an artificial semi-permeable membrane. The salt molecules in the seawater pull the freshwater through the membrane, increasing pressure on the seawater side.

The pressure comes in the form of a 120-meter water column or waterfall that can be utilized in a power-generating turbine. (Read the entire article from the Cleantech Group here. )

Statkraft said the world could potentially derive about 1,600 to 1,700 terrawatt hours per year from osmotic power – the equivalent of half the European Union’s total power production.

Voila! Another way to harness the Earth’s resources for much-needed clean power.

David Fessler, our energy expert, knows we’re at the tipping point. With the increasing emissions coming from the BRIC countries (not to mention our own contribution), a sensible alternative energy solution is absolutely “mission critical.”

Check out his report on global warming.

Ahead of the tape,

Robert Willaims

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