More for windfarms..

Interesting article in New Scientist 

"The upshot of this is that until now wind farms have only been built where there is no aviation radar nearby. That's not too much of a problem in the wide open spaces of the US and continental Europe, but is more limiting for a small island like Britain. Forty wind farm projects that would have generated up to 6 gigawatts of power - representing £12 billion of investment in renewable energy - have been refused planning permission for this reason."

If there was some kind of alternate bladeless wind turbine then it might have a lot more placement opportunities (£12 billion worth).