Scottish Power has completed the extension to Hare Hill wind farm in East Ayrshire.
A total of 35 new turbines have been added to the original 20 which have been generating renewable electricity since 2000.
Almost 1,000 workers and support staff were inducted on the windfarm over a 16 month period, with a peak monthly workforce of over 165 people.
It will now also contribute approximately £3.7 million in total to East Ayrshire Council and New Cumnock Community Council for the benefit of local community projects over the next 25 years.
The new turbines are capable of generating up to 30 megawatts (MW) of green electricity, taking the full site up to a capacity of 43 MW.
Hare Hill Extension is part of a two-year £650 million investment plan by Scottish Power Renewables to build eight new onshore windfarms in Scotland, which will deliver nearly 500 MW of new renewable electricity for the national grid.
Ken Peberdy, Onshore Director, Scottish Power Renewables, said: “Hare Hill was amongst the earliest commercial windfarms in Scotland, and the site has been making an important contribution to Scotland’s green energy goals for nearly 20 now. It is well located with good wind speeds and access to the grid, which made it an ideal site for an extension.
“Beyond our current £650 million investment programme, we plan to continue scoping and developing new sites, as we believe that onshore wind remains a critical component of any future energy mix that seeks to reduce both emissions and costs for consumers.”