BBC: The latest plan to build a barrage across the Severn to generate electricity has been severely criticised by a committee of MPs.
Hafren Power had outlined a 25bn tidal scheme to generate up to 5% of the UK's electricity needs.
But the House of Commons Energy and Climate Change Committee said it could not recommend the plan.
It said that on both economic and environmental grounds the case remained unproven.
In 2010, the then Energy Secretary Chris Huhne pulled the plug on public efforts...