Meanwhile, Friends of the Earth Cymru have hit back at Hain's plans for the Severn barrage saying it has "the potential to be environmentally devastating."
The Director of the environment group, Gareth Clubb, said the tidal barrage would "destroy" vast areas of habitat and "devastate" fish and bird life.
The group says it agrees that using Wales' natural resources for renewable energy is important in tackling climate change, but believe that the barrage could be the "wrong solution."
– GARETH CLUBB, THE DIRECTOR OF FRIENDS OF THE EARTH CYMRU
Tidal energy can be captured by other means with much less damaging consequences, and could be giving us green energy far sooner than the 20 years it will take to build this barrage.