I presume that it is not quoted on any stock exchange. Why take the risk on an unlisted, and therefore illuiqid, security. I believe you would be better off, if you want to invest in Windfarms, putting it into a listed security with known revenues, history etc. e.g. Gamesa or Vestas Wind,(I am not recommending these - just listing as examples if you want to look them up) .
Valuations of wind-related shares are stronly correlated to the oil price - i.e. if oil drops, wind-related shares drop.