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