article_snippet: A £1billion tidal lagoon off the coast of south Wales will form the centrepiece of ambitious renewable energy plans to be unveiled today.
article_snippet: Scheme would be over an area of more than four square miles cordoned off by a breakwater, with power generated as the tides pass through turbines when going in and out.
article_snippet: Below the surface: This graphic shows how the structure would generate energy at high tide, left, and low tide, right, meaning that water will flow through four times daily .
article_snippet: Vast: Scheme would be over an area of more than four square miles of Swansea Bay in South Wales, creating a large tidal lagoon cordoned off by a huge breakwater .
article_snippet: a £1billion plan for the world's first tidal lagoon to generate electricity from turbines in Swansea Bay,
article_snippet: Scheme would need a six-mile sea wall
article_snippet: up to 65ft high - although only half of this would be noticeable from land at low tide, according to Tidal Lagoon Power.
article_snippet: The developers say the  project, along with four others, could meet 10 per cent of our electricity needs from the tides by 2023.
article_snippet: a six-mile sea wall could generate electricity 14 hours a day.
article_snippet: Tidal Lagoon Power believes the project will boost a UK supply chain and create a new export market if it gets the go-ahead.
article_snippet: Developers behind the project believe Developers behind the project could be the first step in developing lagoon technology that could meet 10 per cent of the UK's electricity needs from the tides by 2023.
article_snippet: Tidal Lagoon Power said Tidal Lagoon Power hopes that 65 per cent of expenditure will be in the UK, boosting a home grown supply chain and creating a possible future export market.
article_snippet: the project is claimed that building more, larger lagoons would bring economies of scale.
article_snippet: Other sites where lagoons are being considered, such as the Somerset coast, could have added benefits such as flood defences.
highlights_snippet: Scheme would be over area of four sq miles cordoned off by a breakwater .
  
highlights_snippet: Power generated as tides pass through turbines when going in and out .