operational AEP calculations are simpler than preconstruction estimates because actual measurements of wind plant power production at the revenue meter replace the complicated preconstruction estimate process (e.g., meteorological measurements, wind and wake-flow modeling, turbine performance, estimates of wind plant losses). However, the two methods do share several similarities, including regression relationships between on-site measurements and a long-term wind speed reference, the associated long-term (windiness) correction applied to the on-site measurements, estimates of future interannual variability, and estimates of uncertainty in the resulting AEP calculation. The shared components between operational AEP calculations and preconstruction estimates [@iec15] are listed in Table \[tab:unc\_cat\].

  Uncertainty component                 Description
  ------------------------------------- ---------------------------------------------------------------------------------------------------------------------------------------
  On-site measurements                  Measurement error in met mast wind speeds (preconstruction) or power at the revenue meter (operational)
  [Reference wind speed data]{}         Measurement or modeling error in measured or modeled long-term reference wind speed data
  Losses                                Error in estimated or reported availability and curtailment losses
  Regression                            Sensitivity in the regression relationship between on-site measurements and reference wind speeds
  Long-term (windiness) correction      Sensitivity in the long-term correction applied to the regression relationship between on-site measurements and reference wind speeds
  Interannual variability of resource   Sensitivity in future energy production because of resource variability

The uncertainty values from each 