Swansea Bay's tidal lagoon brings 'exciting times' to Wales
7 February 2014 Last updated at 07:39 GMT
A £850m tidal lagoon planned for Swansea Bay means "exciting times" for Wales, an expert has said.
Roger Falconer, professor of water engineering at Cardiff University, backed the idea, which proposes to provide power for 120,000 homes for 120 years.
Tidal Lagoon Swansea Bay Ltd says it is the first step towards developing technology that could meet 10% of the UK's electricity needs from the tides.
The six-mile-long U-shaped seawall will go from Swansea docks to near Swansea University's new Fabian Way campus.
He spoke to Mai Davies.