The PVGIS version 5.1 models provide data for photovoltaic energy and weather conditions. This version fixes several issues of the previous version. On this website a simple wind model is used to obtain wind power statistics as well. It using resampled wind speed data at a height of 10 meter - and this puts some limitations on obtained accuracy. The wind model takes into account elevation, rotor height and temperature, and the corresponding wind curve is shown in the stats/wind model menu for each location. Since the wind data is evaluated for a single location only, more optimal sites with higher wind speeds may exist nearby. Also different classes of windmills exist, tuned for higher or lower wind speed profiles - and such a tuning is not done. Hence, we recommend using the obtained PVGIS wind power statistics only to get a crude indication of wind power potential. Alternatively, a wider set of wind turbines is supported on www.renewables.ninja with open data available for a wider set of locations world wide.

Several issues are known for the ERA-interim data set, which is used for wind speed at a height of 10 meter in PVGIS release 5.1. These are summarized on following web-page: confluence.ecmwf.int/display/CKB/ERA-Interim+known+issues. Since ERA-interim works with a grid, we see wind artifacts, especially in coastal areas. The next table compares a few locations with clear artifacts between PVGIS and Renewables.ninja:

PVGIS location	Renewables.ninja country	PVGIS/ERA-interim wind artifact
Lisbon, Portugal	Portugal	elevated wind speed 2005-2009
Athens, Greece	Greece	elevated wind speed 2005-2009
Copenhagen, Denmark	Denmark	elevated wind speed

Hence we recommend to use PVGIS post-processed wind data as an indicator only, and consult/use Renewables.ninja post-processed wind data when more detail is needed, and/or www.renewables.ninja for world wide wind power coverage.