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Tidal power

Although tidal power is a source of energy that is not well developed, several plants have recently been built to take advantage of the natural gravitational pull of the sun and moon on the oceans. Tidal power is a form of power generation in which the tide produces energy by driving a generator.

Tidal energy can be exploited in two ways. One is based on the height difference between high and low tide. Water is trapped at high tide and runs through a conventional hydroelectric power plant at low tide. This method is limited to locations in which there is a large tidal range, or vertical difference between tides.

The other method is to exploit the speed and mass of tidal currents, in other words the kinetic energy of tidal water. At present, tidal energy projects and ocean current projects are still at a developmental stage. The Norwegian electricity company Hammerfest Strøm installed a prototype of a tidal power station at Kvalsundet in Hammerfest in 2003. The area between Scotland and the Orkney Islands is suitable for construction of around 40 tidal water turbines, and the plan is for Hammerfest Strøm to supply 40 000 British households with power from 2011.

Read more:
http://www.tidevannsenergi.com/
http://www.hydratidal.com/
http://www.seageneration.co.uk/
http://www.lunarenergy.co.uk/
http://www.nrk.no/nyheter/distrikt/nordland/1.6634014
http://nysgjerrigper.no/Artikler/tidevannet-lager-fremtidens-strom