This from Marinet, the marine network of the Friends of the Earth.
A Tidal Barrage for the Severn estuary is again a hot issue, with Britain's need to rapidly build up renewable energy generation. Barry lies close to the landfall of the proposed mega-barrage and the local FoE group (Barry & Vale) have looked into the various options. Our preference is for tidal current turbines, but we see the debate as continuing.
The rest of the article can be found here .....
MARINET : Renewable Energy from the Sea : Tidal Power in the Severn?
It's well worth a read.
Keith.