Vestas has secured a 235 MW order of V150-4.2 MW turbines and V136-3.45 MW turbines in 3.6 MW operating mode from Invenergy to power the Sapphire Sky wind project in Illinois, USA. The order includes supply and commissioning of the turbines, as well as a 10-year Active Output Management 5000 (AOM 5000) service agreement, designed to ensure optimised performance of the asset.