There are essentially 3 proposals for a barrage:

1 The Shoots, near the 1st Severn Bridge.
2 Weston Cardiff (Lavernock)
10 miles long, most commonly quoted. 7yrs to construct.
CO2 saving - 5.6 MT C)2/yr (based on displacing gas)
CO2 payback - 8 months
3 Minehead - the largest.

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