Homeowners looking to compare energy prices could get more options with the proposed Severn Barrage and it could also create jobs around Port Talbot.
The project could cost £20 billion to build if it is approved and Port Talbot might become a construction hub as its deep waters could make it suitable for materials to be shipped in and out by builders and contractors, reports the Western Mail.
A series of separate barrage plans are being considered by the government and either one could generate enough electricity to cater for five per cent of the UK's national demand.
According to the paper Roger Falconer, professor of water management and director at Cardiff University's hydro-environmental research centre, told Cardiff Breakfast Club: "I think we have tremendous opportunity here in Wales and it is for engineers, scientists and others to deliver the UK's marine renewable energy targets."
A decision on the barrage proposals is due next year and could take around seven years to build if it is authorised.
Expanding renewable energy projects across the UK forms part of the government's plan to ensure energy security.
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