SITE COMPLIANCE calculates the seven main checks required in site suitability assessments according to the IEC61400-1 ed. 3 (2010) standard or alternativly ed. 2 (1999). For each main check the module evaluates if a particular wind turbine class (e.g. IIA) complies with the actual site and layout conditions.

SITE COMPLIANCE helps identify critical risks in a wind farm project, and includes easy export of results to fulfill input required by most wind turbine manufacturers.

Easy IEC calculations

The module calculates the seven main checks at hub height of each wind turbine position as required in IEC 61400-1 ed. 3 (2010):

  • Terrain complexity
  • Extreme wind
  • Effective turbulence
  • Wind distribution
  • Wind shear
  • Flow inclination
  • Air density

Several calculation methods are possible for each main check. Results of multiple methods for a check are easily compared to help choose the most appropriate method and test how results depend on model setup and choice of data. The module also includes calculation of the supplementary checks:

  • Seismic hazard
  • Lightning rate
  • Extreme and Normal temperature range

Prior to calculating the main checks users must select on-site measurements (if any), wind turbines and the flow models to use. Full integration to the flow  models WAsP and WAsP Engineering 3 is included in the module with easy-to-use interfaces. Thus, dedicated WAsP and WAsP Engineering calculations are run inside the SITE COMPLIANCE module, if licenses to one or both of these flow models have been purchased separately. The flow models define the flow field (i.e. variation) of wind speed, turbulence and flow inclination utilized in calculation of the main checks.


The calculation options in SITE COMPLIANCE to calculate the IEC checks have been certified by TÛV SÛD for consistency with the requirements in the EC 61400-7 ed. 3 standard.

Input Data

SITE COMPLIANCE is a versatile module and may be used with quite different input data. A typical user has one or more on-site masts (Meteo Objects) and a WAsP license. This is enough to perform all of the seven IEC main checks. If the user also has a WAsP Engineering 3 (WEng3) license, extra calculation options are available.

A full site compliance evaluation may also be performed when no site mast is available. In this case a WAsP license, a cali- brated wind statistics (in a Site Data Object) and a WEng3 license are required to calculate the seven main checks. All main checks may also be completed with only a representative site mast (Meteo Object) and no flow models. This setup is mainly relevant for small sites in very simple terrain or offshore.

Flexible and easy to use

The main purpose of the module is to offer users a tool, which makes it easy and fast to calculate all the seven main checks in a consistent and IEC compliant way. Yet the module still allows easy change of important model assumptions to analyze their effect on the results. This is ensured by letting the user define all the input data: site masts, WTGs and results of flow models prior to calculating the checks.


The main report page of SITE COMPLIANCE summarizes the outcome of the seven main checks for the park, clearly highlighting critical risks, i.e. checks where the chosen turbine model does not comply with the conditions on the site. The report summarizes all the main assumptions in the calculations and presents the results turbine for turbine.

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