Question

How is tidal energy collected?

Answer 1

the wind

Answer 2

turbines are placed underwater in areas which have high tidal movement. These turbines are designed to capture the energy produced by the tidal movement and is then transformed into electricity.
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.
Although the energy supply is reliable and plentiful, converting it into useful electrical power is not easy.
There are eight main sites around Britain where tidal power stations could usefully be built, including the Severn, Dee, Solway and Humber estuaries. Only around 20 sites in the world have been identified as possible tidal power stations, because they need a large bay or estuary with a narrow outlet to the sea.