A British company, Tidal Lagoon Power, is proposing to develop a network of tidal lagoon power stations. It says that it could provide 10% of the UK’s power needs by building at least five full-scale tidal lagoons in UK waters by 2023,

Tidal lagoons are man-made sea wall structures that impound areas of water. As the tide rises and falls, the water is held back and its energy is harnessed as it passes through the turbines.

The first tidal lagoon is proposed for Swansea Bay would have a capacity of 320 MW and could generate 420 GWh a year for its design life of 120 years.

The company hopes to commence construction of the Swansea Bay Tidal Lagoon in 2015 and to complete it in 2017 or 2018.