I believe that the blades will be made from carbon fibre (the same material that they use to build Formula One cars) and may well be hollow. I'll see if I can find any further information about this.
Meanwhile I wonder if there is any publicity in you local media about the supplier.
There are long-established firms in Denmark (and maybe also Holland) but I'm surprised that there isn't a supplier nearer to NZ.
Those companies that have set up in the UK have struggled to survive I believe.
Maybe it's true that your part of the World is (several?) decades behind the UK?
Edited to add:-
http://www.windflow.co.nz/