Long-term Correction done in the pre-construction energy yield report carried a considerable source of uncertainties caused by:
A completely new energy yield estimation with much more sources of information is recommended to reduce uncertainties in long-term correction. Regarding the new energy yield estimation, one of the data sources is the historic real performance already done in PART 2.
The other data source is the new measurement wind data acquired in the period of construction of the wind farm until now, which can more than double the total period of measurement. This means that the more historic wind information you get, the less uncertainties in the long-term correction you have.