Hasn't East Midlands Airport recieved approval to site 4 of them on the Aiport itself to offset their energy costs...... Odd thing is or am I being cynical, they could just as easily stick them anywhere as Energy provided goes into the national grid and the get revenue from it, so they would still be off setting the costs........ but I suppose it does not look like your doing your bit if they cannot be seen, just hope no one flies into one, If they could predict 100% the path of every aircraft in trouble we wouldn't have crashes would we..
What next Underground Airfields and runways? Ohh wait, the Koreans have apparently just done that.