Osmotic Power Plant In Norway
Youtube text: Osmotic Power – The energy is based on the natural phenomenon osmosis, defined as being the transport of water through a semi-permeable membrane. This is how plants can absorb moisture through their leaves — and retain it. When fresh water meets salt water, for instance where a river runs into the sea, enormous amounts of energy are released. This energy can be utilized for the generation of power through osmosis. At the osmotic power plant, fresh water and salt water are guided into separate chambers, divided by an artificial membrane. The salt molecules in the sea water pulls the freshwater through the membrane, increasing the pressure on the sea water side. The pressure equals a 120 metre water column, or a significant waterfall, and be utilized in a power generating turbine.
Statkraft prototype Tofte/Norway
A 10 kW prototype was realized in 2008. A commercial scale implementation is expected to become operational in 2015. This is expensive technology.
[wikipedia.org] – Prototype Tofte/Hurum, Norway (10 kW)
Promotional video from Norwegian power company Statkraft explaining the principle of getting electricity from the combination of sweet and salt water.
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 here. 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.