Presented byT.SRAVYA(KU)

CONTENT:

INTRODUCTION CURRENT SITUATION WORLDWIDE DISTRIBUTION HOW IT WORKS ADVANTAGES DISADVANTAGES CONCLUSION

INTRODUCTION

Tidal energy is the energy from the sea. A few years ago, "tidal power" meant "tidal barrage",

but these days there are other options as well The tide moves a huge amount of water twice each

day and harnessing it could provide a great deal of

energy - around 20% of Britain's needs. The energy supply is reliable and plentiful

Current situation   Tidal Energy is sustainable, clean, reliable, widely Tidal Energy is sustainable, clean, reliable, widely

distributed, and can offer significant benefits to many distributed, and can offer significant benefits to many marine nations.marine nations.

Tidal Energy can be captured in an efficient Tidal Energy can be captured in an efficient and cost-effective way.and cost-effective way.

Tidal Energy is not yet recognized by the United Tidal Energy is not yet recognized by the United Nations as an energy resource that should receive Nations as an energy resource that should receive support and funding for its developmentsupport and funding for its development.

Tidal Energy is a clean, renewable source of Tidal Energy is a clean, renewable source of energy--such as solar, wind, biofuels, and low-head energy--such as solar, wind, biofuels, and low-head hydro-- and deserves official international support hydro-- and deserves official international support and funding for its developmentand funding for its development

The WorldwideThe Worldwide Distribution of Distribution of Tidal Energy Tidal Energy

How it works:  

The largest tidal power station in the world (and the only one in Europe) is in the Rance estuary in northern France, near St. Malo. It was built in 1966.

December 2008: A "Tidal Reef" across

the Severn Estuary is being proposed.

Advantages

Once you've built it, tidal power is free. It produces no greenhouse gases or other waste. It needs no fuel. It produces electricity reliably. Not expensive to maintain. Tides are totally predictable. Offshore turbines and vertical-axis turbines are

not ruinously expensive to build and do not have a large environmental impact.

Disadvantages

A barrage across an estuary is very expensive to build, and affects a very wide area

Only provides power for around 10 hours each day, when the tide is actually moving in or out.

There are few suitable sites for tidal barrages

Tidal Power is renewable Doesn't cause pollution, doesn't need fuel A tidal barrage is very expensive to build Only works when tide is going in or out A tidal barrage affects a large area There are very few places that you could sensibly

build a Tidal barrage Underwater turbines may be a better bet than a

barrage - they are cheaper and don't have the huge environmental impact