The United Kingdom has approved a 500-megawatt wind farm proposed by a group including Scottish Power PLC and Dong Energy A/S at Duddon Sands off the northwest coast of England.

Prime Minister Gordon Brown is to announce the go-ahead for the farm, off Cumbria, the Department for Business, Enterprise & Regulatory Reform said Thursday. Eurus Energy Holdings Corp. is also part of the group developing Duddon Sands, which will have a maximum of 139 turbines and supply as many as 372,000 homes.

The U.K., Europe’s windiest country, aims to get 15 percent of its energy from renewable sources by 2020, under a European Union proposal, compared with 1.8 percent last year. Start of construction at Duddon Sands, which will be one of Britain’s biggest offshore farms, will be “determined by supply availability” of turbines, Scottish Power spokesman Simon McMillan said by telephone. The project will take “several” years to complete once construction begins, he said.