The project was initially developed by RWE Npower Renewables. The original plan was for 240 turbines with a nameplate capacity of 1,200 MW, which could have made it the largest offshore wind farm in the world. In July 2013 the government approved a plan for 288 turbines generating 1,200 MW. In January 2014 the developer RWE npower announced that it had now chosen to progress with a reduced plan which ranges between 600 and 900 MW, rather than the maximum of 1,200 MW. In February 2015 Statkraft acquired a 50% stake in the project.