Trustpower's Tararua wind farm.
http://www.windenergy.org.nz/tararua-wind-farm
This has a combined capacity of 161MW with average annual generation of 620GWh. The maximum energy that can be generated in any year is:
161MW x 24 hr/day x 365 day/year = 1410360 MWh/year = 1410 GWh/year
This would suggest the Trustpower Tararua windfarm will operate at: 620/1410 = 44.0%
Both of those operating yields seem high for a wind farm. Nevertheless they are in close agreement. That would suggest the wind farm Capacity Factors that I have calculated are correct.