A 50:50 joint venture between energy companies RWE and Scottish and Southern Energy (SSE), the £1.6billion project was first awarded development rights by The Crown Estate a decade ago.
Offshore construction began in 2009, the first two turbines produced power to the National Grid in 2011, and the project was completed in 2012.
The 140 3.6MW Siemens turbines sit 23km off the Suffolk coast.
RWE Innogy CEO Dr Hans Bunting, said Greater Gabbard was for many years the largest wind farm under development anywhere in the world.
‘Greater Gabbard has been a pioneering project during this period and can proudly take its place as a major milestone in the development of the UK offshore wind industry’, he said.
Earlier this year, the RWE/SSE consortium settled a two-year legal dispute with engineering firm Fluor over monopiles and transition pieces at the site.