The projects 228MW Pen y Cymoedd in South Wales and 1,200MW Triton Knoll Offshore wind farm are being developed by Swedish power firm Vattenfall and RWE Npower Renewables, respectively.

Secretary of State for Energy Edward Davey noted that the Vattenfall and RWE Npower Renewables demonstrate ability of the UK to attract inward investment.

"These two projects will attract billions in investment into the UK, support hundreds of skilled green jobs in Lincolnshire, Norfolk and in the county boroughs of Neath Port Talbot and Rhondda Cynon Taf whilst providing homes with clean energy," added Davey.

RWE Npower Renewables is developing Triton Knoll wind farm with an investment of £3.6bn with the 288 turbines, while Vattenfall will invest £400m to construct 76-turbine Pen y Cymoedd wind farm.

Vattenfall is intending to commence the construction of the project in 2014 and power generation by 2016. The company has also committed annual investment of £1.8m for community funds over the 25 year life of the wind farm.