Robin Rigg Wind Farm: bigger turbines

 

Robin Rigg wind farm was visible on the horizon in the sunshine from Southerness Point. I looked up the turbines. Like Watchtree, they are Vestas but this time V90. The serial number refers to the diameter: they have 90m diameter whilst the V47s at Watchtree are 47m. The wind speed for cut in, rated and cut out are the same. These big turbines generate 3MW as opposed to the 660kW of the smaller ones. The swept area of the big ones is 3.67x the smaller (6362m^2:1735m^2). However 660 x 3.67 = 2.4Mw so there is more to extra power generated than just the extra wind energy gathered.