Update: 2 January 2017. I have updated the urls as the register has had a change of name to the New Zealand Emissions Trading Register.
The New Zealand Emission Unit Register, which records legal title for all valid carbon credits/emissions units in the New Zealand Emissions Trading Scheme, can be searched.
One possible search gives a list of account holders and the volume of Kyoto Protocol emission units the account holder owned at the end of the calendar year. This search shows the types of Kyoto units held, the two commonest types being the Emission Reduction Units (ERUs) and the Certified Emission Reduction units (CERs).
What interests me is who owned these units? Who imported them? As Brian Fallow pointed out, the cheaper units collapsed the price of all units in 2011 and 2012
The imported units were not only too cheap and too plentiful. Most of them it appears were fraudulently issued.
In two scathing blog posts last December, No Right Turn traced the serial numbers of some Emission Reduction Units and Certified Emission Reduction units that New Zealand had "retired" to comply with the Kyoto Protocol, back to fraudulent projects in the Ukraine and Russia.
I have taken the annual lists of unit holders from the html tables on the Emissions Unit Register's website and uploaded them to Google Sheets. Here they are from 2008 to 2014. At some stage I will do some analysis. In the meantime, feel free to download them.