Tidal barrages

What are tidal barrages?

Big dams built across river estuaries

How do tidal barrages work?

As the tide comes in it fills up the estuary. The water is then allowed out through turbines at a controlled speed

How are tides produced?

Tides are produced by the gravitational pulls of the moon and the sun

How are tides used to generate electricity?

A tidal barrage

What kind of pollution does tidal barrages produce?

No pollution

What are the problems with tidal barrages?

Preventing free access by boats

How reliable is wave power?

Tides are pretty reliable = they happen twice a day without fail and always near to the predicted height

What are the disadvantages of wave power?

The height of the tide is variable so lower tides will provide significantly less energy than the bigger 'spring' tides

How expensive is wave power?

Initial costs are moderately high