WAT is a post-processor of calculations by WAsP and WAsP Engineering and the main purpose is to facilitate IEC site assessment. In addition WAT predicts annual energy production with uncertainty and including effects of sector management and other technical losses. WAT also facilitates the terrain and obstacle assessments needed for IEC standards on power-performance measurements.

IEC 61400-1 site assessment

  • Extreme wind speed
  • Wind shear
  • Flow inclination
  • Wind speed distribution
  • Effective turbulence intensity including effects of sector management
  • Extreme ambient turbulence intensity
  • Terrain assess and Cct turbulence structure correction factors
Annual Energy Production
  • Air-density correction of power curves 
  • Wake effects
  • Wind sector management
  • Turbine availability
  • Internal transmission loss
  • Grid curtailment
  • Uncertainty and conservative  P90 and P75 AEP estimates
IEC 61400-12-1 for in-situ power-curve measurements
  • Obstacle assessments
  • Terrain assessment
IEC 61400-12-2 for power-curve by nacelle anemometry
  • Obstacle sub-division
  • Effect of wind-direction fluctuations on usable measurement sector
  • RIX–numbers for terrain assessment