This technical report provides a method for measuring power output versus wind speed for an entire wind farm. This is distinct from IEC 61400-12-1 and 61400-12-2 which are intended to provide methods for measuring power performance of an individual Wind Turbine Generator (WTG). The Download button above will direct you to the American National Standards Institute webstore where you will be able to complete your purchase. Disclaimer: This document is proprietary and its use is subject to a legally binding license agreement and disclaimer (the “Agreement”) which can be found online here, as it may be updated from time to time.