Telegraph: The tidal power at the mouth of the River Severn has the potential to generate up to 5 per cent of the UK’s electricity needs. At the moment the Government is currently looking at 10 different proposals on how to harness the power, including a tidal reef and a barrage. A barrage from Cardiff in Wales to Weston-super-Mare in Somerset on the other side of the river, is the most well known option. However it is unpopular with conservationists who say that the 10 mile dam will be …