The first phase of the 630MW array is complete and it is exporting electricity to the national grid.
Project director Richard Rigg, said: “This is the final major milestone of the construction phase and the culmination of more than two years’ offshore construction work which began in March 2011 with the installation of the first foundation.
“It has been a complex operation but I am delighted that the commissioning of the wind farm has now been completed on schedule, despite the worst of the winter weather.”
The project has started handing over to the operations and maintenance team, which will be completed in the summer when the last shallow array cable has been buried.
Tony Cocker, chief executive at E.ON UK, said: “It’s been a tough time for the team working on site.
“The recent bad weather and north easterly winds have whipped up the waves preventing access to the site so this milestone is true reward for their hard work.”
Dong Energy owns 50 per cent of the consrotium behind the London Array windfarm. Eon UK has a 30 per cent stake, while Masdar owns 20 per cent.