Located in the Irish Sea with a total capacity of 659MW , the Walney Extension Offshore wind farm has a total of 40 MHI Vestas 8MW wind turbines and 47 Siemens Gamesa 7MW turbines . The farm is owned in a 50-50 split between Orsted with the second half divided between Danish Pension Funds PKA and PFA .

Beginning in September 2019 , the project has enough power capacity for 600,000 homes and covers around 145km2 of the Irish Sea .

As the fifth largest wind farm in the world , Shepards Flat which is located in Eastern Oregon , has a power capacity of 845MW . The farm , developed by Caithness Energy , consists of 338 GE 2.5XL turbines with each capable of producing 2.5MW capacity .

The farm powers 235,000 houses with the output being supplied to Southern California Edison . Work on the project started in 2009 at an estimated cost of US $ 2bn . The US Department of Energy loaned US $ 1.3bn to aid the investment in October 2010 . The farm then became fully operational in September 2012 .

66 December 2022