A controversial plan for a 10 mile barrage across the Severn Estuary could be the biggest tidal power scheme in the world.

It could generate the same amount of power as two nuclear power stations.

As public protests mount against a gas pipeline being built across Wales to supply the country's fuel needs, would a scheme on this scale be a real green alternative?

Its advocates, including the Assembly Government, say we should take the £14 billion Severn Barrage seriously if we want to secure energy sources for the future not involving fossil fuels.

This week, a new report from environmental campaigners warns this vast engineering project - as big in scale as the Euro Tunnel - will cost too much to build, will damage the local environment, and won't deliver enough power in time to help the planet.

On Wales@work Sarah Dickins and guests examine the case for and against the proposed Severn Barrage.