The project involved constructing the wind turbines and their foundations, building two offshore substations and installing two undersea power cables, one for each phase, and two short onshore cables to connect to two existing onshore electrical substations for connection into the UK National Grid.

[16] The wind farm was officially opened on 9 February 2012 by the new energy secretary, Ed Davey, MP,[5] although the last of the 51 turbines in Walney 2 were only activated in April 2012.

[17] In November 2014 DONG Energy was given development consent for an extension to the Walney offshore wind farm.

[20] In April 2018, the final turbine of the 87 installed for Phase 1 was completed, with full operation commencing in September 2018.

[21] In 2014 a dive vessel, owned by Danish firm Offshore Marine Services, was carrying out routine inspection work when an anchor cable broke and the ship hit one of 102 turbines installed at the Walney Offshore Wind Farm.

The UK’s Maritime and Coastguard Agency surveyed the crash site and reported that a surface sheen stretching 33 feet wide and 0.7 nautical miles long was trailing the vessel.