The Clyde onshore wind farm has begun producing electricity for the national grid.
The £500 million Scottish and Southern Energy site in South Lanarkshire is still under construction, but its first turbine is already in operation.
The first section of the wind farm - the South section, with a capacity of 130MW - is due to be completed in November.
Construction work at the site is scheduled to be completed next year, with its total installed capacity set to reach 350MW.
Once in operation, the 152 turbines at the site will produce more than 1 TWh of electricity every year.