Development rights were secured from the
Crown Estate in 2003. The project was originally developed by Greater Gabbard Offshore Winds Limited (GGOWL) which was a joint venture between
Airtricity and
Fluor. Airtricity was subsequently bought by
Scottish & Southern Energy who then bought out Fluor's 50% stake. Fluor were contracted to design, supply, install and commission the balance of the plant. The project was given the go-ahead in May 2008 and work started in June. In July 2011 erection of the turbines was two-thirds complete, with all the pile foundations installed. In October 2009, Seajacks Ltd delivered its 7,000 tonne Leviathan vessel to Fluor Ltd which sailed to
Harwich to prepare the hook-up and commissioning of an in-field substation and then installation of the turbines. The first foundations were installed in autumn 2009 with the first of a total of 140 turbines installed in the spring 2010. Electricity generation began on 29 December 2010 and construction was completed on 7 September 2012. The project was developed in partnership by
Innogy and
SSE. In November 2013 the project capacity was reduced to 68 turbines producing 340 MW. In March 2014, SSE announced that it would be pulling out of the project. but in December the company revealed that it was still seeking potential investment partners. In October 2015 Innogy secured the financing of the project with three other investors each taking 25% of the project:
Macquarie Capital,
UK Green Investment Bank and
Siemens Financial Services.
Siemens Wind Power was awarded the turbine supply contract to deliver 56 SWT-6.0-154 turbines. At its September 2018 inauguration, Galloper is rated at 353 MW. It is owned by Innogy SE (25%), Siemens Financial Services (25%), Sumitomo Corporation (12.5%), ESB (12.5%) and a consortium managed by Green Investment Group and Macquarie Infrastructure and Real Assets (25%). Innogy SE led development and construction of the wind farm. == Operation ==