More than 20 turbines are planned for the site.
Significant works are underway at a wind farm in Offaly.
The Derrinlough Wind Farm project has just seen overhead line masts installed to connect the site to the transmission system.
The site is located on Clongawny and Drinagh bogs in Offaly and will consist of 21 turbines, each with a blode tip height of 185 metres.
The wind farm is expected to export a maximum of 105 megawatts when complete.