Windpower 2.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the program is PelaFlow Consulting. The program is categorized as Education Tools.
Commonly, this program's installer has the following filename: Windpower.exe. The most popular version among Windpower users is 2.0. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
WindPower is an interactive computer program that can be used to calculate the performance of wind turbines ranging from small domestic units with rotors of a metre or two in diameter up to the largest commercial units with rotor diameters of around 100 metres in diameter. It can be used for both horizontal axis wind turbines (HAWTs) and vertical axis wind turbines (VAWTs).
You may want to check out more software, such as StatPlus 2007, GenScn or Illusionae, which might be similar to Windpower.