Vat rate on wind turbines

What vat rate is chargeable on sale of wind turbines. Revenue website does not specify it.

Not sure if this is of any use?

http://www.kildarestreet.com/wrans/?id=2010-04-28.841.0

Or this since it's one arbitrary (via Google search) supplier which seems to be charging standard rate VAT?

http://www.techstore.ie/Renewable-Energy/Wind-Energy/Wind-Turbines.html

possibly --13.5%

[broken link removed]

but here the diy one is 21% so maybe the others are only 13.5 % due to 2/3 rule --

[broken link removed]

Edit

confirmed -- supply and install agreement = 13.5 %
supply only = 21%

http://debates.oireachtas.ie/dail/2011/06/15/00073.asp