Due Diligence

Review of existing site assessment studies

For a wind farm project in its planning phase it is often necessary to review the existing site assessment studies and energy yield calculations. anemos compares the given reports in detail and prepares a review report in consideration of the requirements of the German Technical Guideline 6 (“TR6”) and other relevant guidelines.


The focus of the comparison and plausibility check is on the following aspects:

  • comparison of all given coordinates, turbine types, power and thrust coefficient curves, for the existing, the planned and the reference turbines
  • input data such as orography, roughness and obstacles
  • wind information (measurements, wind statistics, wind distribution, etc.)
  • methodology, simulation models
  • reference periods
  • long-term correlation
  • possible energy loss calculations caused by restrictions due to shade impact or sound emissions, bat flight or sector management
  • plausibility calculations
  • energy yield calculations, power curves, wind farm efficiency
  • uncertainty analysis
  • information on the wind volatility

Your contact person

Lasse Blanke

Lasse Blanke
Tel.: +49 (0)4131 83 08-118
lasse.blanke@anemos.de


In addition, anemos reviews and evaluates the reports and sites based on its own long-year experience. Thus, we go beyond the formal requirements of the Technical guideline. Own analyses and calculations are usually not part of the review, but can be agreed upon with the client on an individual basis.

Evaluation of existing wind farms - Production-DD

The evaluation of existing wind farms is based on its production data, if those are available for a sufficient time. These are long-term correlated, in order to estimate the most probably mean long-year energy yield. As such an analysis is directly based on the energy production, most of the uncertainty aspects of a site assessment study can be avoided.


The following steps are part of the analysis:

  • data collection
  • consistency check
  • long-term correlation
  • weighting of the individual results based on given criteria
  • uncertainty estimation

The reports include all individual results as well as a detailed documentation of the analyses.


Your contact person

Dennis Peltret

Dennis Peltret
Tel.: +49 (0)4131 83 08-106
dennis.peltret@anemos.de

Operating data analysis

An operational data analysis investigates the performence of each individual wind turbine. Based on the so called SCADA (Supervisory Control and Data Acquisition) data usually available as 10-minute resolution, detailed tests can be performed with respect to the requirements and necessary parameteers. What would have been produced without still stand times? How much energy loss was attributed to curtailments due to licensing requirements? Is the power curve reasonable? What is the temporal, technical or energetic availability?


The following steps are part of the operational data analysis:

  • data collection
  • categorisation of different performence behavior
  • detection of untypical performence behavior
  • calculation of temporal, technical and energetic availability
  • daily and monthly means
  • long-term correlation
  • weighting of the individual results based on given criteria
  • uncertainty estimation

Your contact person

Dennis Peltret

Dennis Peltret
Tel.: +49 (0)4131 83 08-106
dennis.peltret@anemos.de


The reports include all individual results as well as a detailed documentation of the analyses.


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