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Box 7.2 Power produced and land used by wind farms – a rough calculation
Pages 11

The offshore potential is much less constrained. For example, between 100 and 150 TWh p.a. could in theory be obtained from sites in shallow water off East Anglia, i.e. over a third of the UK electricity requirements, and more from sites further out. Indeed in theory offshore wind could supply all the electricity the UK needs.