How efficient does a wind turbine or a wind farm perform under real operating conditions? We evaluate turbine power performance using precise measurements and accredited assessments. Our independent evaluations provide reliable data for manufacturers, developers, investors, owners and operators. Supporting technical decisions, requirements and long-term performance assessment. We combine detailed measurements concepts with site-specific assessments to ensure that power output is evaluated under representative conditions. From prototype testing and verification to ongoing performance assessments, we provide transparent and reliable results.