Denmark to build world's first 'energy island' in North Sea 5 Feb 20215 February 2021 Last updated at 13:27 An impression of the island, surrounded by offshore wind turbines, 260m (850ft) in height A project to build a giant island providing enough green energy for three million households has been given the go-ahead in Denmark. The world's first energy island will be as big as 18 football pitches, but there are hopes to make it three times that size. It will serve as a base for 200 giant offshore wind turbines. It is the biggest construction project in Danish history, costing an estimated 210bn kroner - that's roughly £24 billion!