NOTES FOR USERS OF THESE STATISTICS
The latest version of the statistics now provides:
Further, the fuels displayed reflect those used by member registries, normally at the most detailed level. Due to the more detailed information now being kept, some information is at a high level. For instance, "Solid - unspecified wood" might contain forestry products, energy crops and so on. Similarly, "liquid - renewable fuels" may contain black liquor. However, when this has been recorded, then it is displayed as such. Hopefully, over time, all registries will provide information at the more detailed level, enabling more accurate analysis.
As other certificates are issued for technologies not on the current list, so these categories will be added and reported against.
Missing and seemingly contradictory data
A further point for consideration is that the new data has only recently started to be collected by registries. Hence, it will be found to be absent in the earlier data; and for those countries where the registries have yet to be converted to capture and report this information. However, given the recent restriction on the lifetime of certificates, this matter should all but disappear within the next year or two.
This explains a number of anomalies - for instance, the difference between the total number of certificates cancelled for all production years, and the total number of certificates cancelled by year of transaction: while all registries report when certificates are cancelled; not all registries report the production year to which they relate.
Production and Transaction statistics
Thus Production --> issue is the number of GOs issued for electricity produced in a specific month, while Transaction --> issue is the number of GOs issued during a specific month, regardless of when the associated electricity was produced (note that GOs are issued one or more months after the electricity is produced).
Similarly, Production --> cancelled is the number of GOs cancelled which relate to electricity produced in a specific month, while Transaction --> cancelled is the number of GOs cancelled during a specific month, regardless of when the electricity was issued.
For each of the above (Production and Transaction):