Vattenfall has installed the first of 76 Siemens 3MW turbines at the 228MW Pen Y Cymoedd windfarm in South Wales, UK.
Installation work on the site started in January, with plans to complete the installation of a further 75 turbines by the end of this year.
The project is located on land managed by Natural Resources Wales within Rhondda Cynon Taf and Neath Port Talbot.
Vattenfall Pen y Cymoedd wind energy farm project director Will Wason said: "There is still some way to go but I'm pleased that Siemens and the team have safely erected the first of 76 wind turbines.
"As Wales's largest onshore windfarm, Pen y Cymoedd will have a big impact on annual carbon emissions and help secure home grown energy."
When operational later this year or in early 2017, the windfarm will generate enough energy to power more than 140,000 homes in the UK per annum, or 10% of homes in Wales.
The clean electricity generated at the project will reduce more than 200,000t of CO2 emissions per year based on government assessments of carbon dioxide emissions per unit of power generated in 2013.
A joint venture of Jones Bros and Balfour Beatty is responsible for providing the civil works for the windfarm.
ABB is carrying out the implementation of grid connection for the project.
Image: The first of 76 Siemens 3MW turbines has been installed at the 228MW Pen Y Cymoedd windfarm. Photo: courtesy of Vattenfall.