First phase The first phase was built by C-Power, at a cost of
€153 million. It was
commissioned in June 2009. The first phase of what will ultimately be a 325 MW wind farm was completed in September 2008. The six
REpower 5 MW turbines, which were installed on concrete
gravity foundations, were linked to the Belgian power grid, giving a total rated capacity of 30 MW for the first stage. The full story of the design, engineering, construction and installation of the Thorntonbank Wind Farm (first phase) is told in an illustrated book that was published in November 2010.
Second and third phase In these phases, a total of 48 additional wind turbines of 6.15MWp were installed. Phase 2, completed in October 2012, comprises the installation of 30 of the 48 wind turbines. In the third and last phase, completed in September 2013, the remaining 18 wind turbines were installed, bringing the total capacity to around 325 MW. == Environmental assessment ==