The new investment is worth 4.7 billion kronor ($400 million) and will put Vattenfall firmly on the power grid map as one of the UK's leading producers of wind-powered electricity, the company said in a statement on Thursday.
"As the British government sees the extension of land-based wind power as an important component to economic growth and supports its development, the British markets is profitable for us," said Peter Smink, head of Vattenfall's sustainable energy projects.
The first park of 76 wind turbines will be built in south Wales, near Neath Port Talbot and Rhondda Cynon Taf. Installed capacity of 228 megawatt would allow the park to service the annual electricity needs of about 140,000 homes, if the turbines run at full capacity without any snags. Electricity generation could begin at the end of 2016, the company predicted.
Some 18 wind turbines are currently being erected at the Clashindarroch Wind Farm in Aberdeenshire in east Scotland. The park should be up and running by the start of 2015, the company said.
Vattenfall began investing in UK wind farms in 2008 and runs Thanet, off the Kent coast in southeast England, which is one of the world's biggest off-shore wind farms.