You see clearly the years when the big farms had to deal with serial defects  - very early on at Horns Rev (where all the gearboxes had to be replaced within the first year or two), and after a few years at Nysted (where the gearbox problems were less publicized but did require large scale action with the same performance impact as on Horns Rev). Anf both are now performing at high levels (and have given their respective manufacturers, Vestas and Siemens, massive experience which they are now using profitably on their new turbine models)

Wind power