The Government has today backed a report which casts serious doubt over plans for a giant barrage across the Severn Estuary.
Ministers have agreed with a committee of MPs who said they could not recommend the £25 billion scheme.
The company behind the plans claims a barrage from Brean Down to South Wales could produce five per cent of the UK's energy.
But the committee says it's failed to provide enough evidence about what subsidies it would need, the impact on the environment, and potential job losses at the port of Bristol.
The news has been welcomed by environmentalists and wildlife experts.
A committee of MPs has chosen not to recommend plans for a giant barrage across the Severn Estuary.
The Energy and Climate Change Select Committee were not convinced that the economic case for the £25billion pound scheme put forward by a private consortium was strong enough.
They also expressed concerns over the environmental impact caused to the mudflats on the Severn.
Hafren Power, the company set up by investors hoping to build and operate the Severn Estuary barrage, has announced that five global companies are now working on the project.
They have expertise in engineering, construction, project management and logistics and are working with Hafren Power on its proposal to build a £25 billion, 18km (11 mile) electricity generating barrage across the Severn estuary.
Arup, Bechtel, DHL, Mott MacDonald and URS are currently assessing what will be required to manage the planning consents and environmental approval processes.
If the Barrage eventually gets the go-ahead, the nine-year build would be the biggest British infrastructure project since the Channel Tunnel.
A former Minister has urged the Government to get behind the Severn Barrage project.
It would cost a staggering twenty five billion pounds - of private sector money - and according to former Welsh Secretary Peter Hain, would generate five per cent of the country's entire electricity from tidal power.
However it's strongly opposed by conservation groups - who say it would damage internationally-protected mudflats - and by the port of Bristol. Today MPs heard both sides of the argument, as our political correspondent Bob Constantine reports.
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Falklands War Veteran Lee Townsend from Yate in South Gloucestershire and retired army major John Winskill from Durrington in Wiltshire are in a stable condition in hospital. They were travelling in a support vehicle involved in a head on crash in Peru. Two other people are thought to have died.
Andy Richards of the Unite union says there is "significant" public support in Wales for the Severn barrage. He said it was time to move on from the "scaremongering" and start to examine the detail of the proposal by Hafren Power, the firm behind the scheme.
Labour MP Peter Hain, told the Energy and Climate Change Committee that the prospect of a Severn barrage has been 'studied to death' and it's time it all went ahead. He said the project would create 50,000 jobs and provide flood protection to 90,000 properties.
Simon Bird, the boss of the Bristol Port Company has told a committee of MPs that building a barrage across the Severn estuary could be a "killer" to his business.
The boss of the Bristol Port Company has told a committee of MPs that building a barrage across the Severn estuary could be a "killer" to his business.
Simon Bird was giving evidence to the Energy Select committee which is looking at the 25 billion pound scheme to generate electricity from tidal power. Simon Bird said a build-up of silt behind the barrage make it harder for large ships could reach the port.
The Prime Minister, David Cameron, is said to be backing plans for the controversial Severn Barrage.
It's claimed the 30-billion-pound scheme would generate five per cent of Britain's energy needs and give the South West economy a huge boost. But conservationists claim it would have a devastating effect on wildlife