Table 1: The shortlist

Project Generating capacity (GW) Estimated cost
Cardiff-Weston barrage 8.64 £20.9 billion
Shoots barrage 1.05 £3.2 billion
Beachley barrage 0.625 £2.3 billion
Bridgewater Bay lagoon 1.36 £3.8 billion
Fleming lagoon 1.36 £4.0 billion