The experts from Pavana GmbH assess the impact of external factors on wind conditions at your particular wind farm site:
- Wind data measured at or near the site provides the basis for this assessment. The usability of the data is determined based on an assessment of whether it is representative of the site. This depends on the terrain, vegetation and the extent of the planned wind farm.
- The wind data that is representative of the site is adjusted to produce a long-term representative value (usually between 10 and 20 years). Using a suitable flow model, the long-term representative wind data is then modelled at the positions of the planned turbines at their hub height.
- Next, these position-specific wind conditions are combined with the performance characteristics of the planned wind turbine and a potential energy yield is calculated for each single wind turbine at these positions.
- Using another physical model, the loss through wakes from other turbines is determined. The result is the yield for the farm. Losses for other location factors and system conditions are deducted from this. These include network and transmission losses, the unavailability of the wind turbine, infrastructure or grid, and operating restrictions that are required to reduce acoustic noise or imposed for the protection of birdlife.
The results of this expert report essentially constitute the valuation basis of a wind farm with a view to the energy yield. They underpin the profitability analyses and the rating of the location-specific site quality as a basis for the remuneration level in the current Renewable Energy Sources Act (EEG). They are therefore a safe bet.