Unit types

There are different types of units in emissions trading and in the Union Registry. Certain unit types can only be held on accounts in the EU ETS while others may only be held on accounts in a registry under the Kyoto Protocol. Some unit types can be kept in both registries. Common to all types of units is that they correspond to one tonne of carbon dioxide equivalents.

 

Below is a table describing which units can be held in each registry:

Unit type

EU ETS KP
AAU   X
CER X X
ERU X X
EUA X  
EUAA X  
lCER/tCER   X
RMU   X

Unit types in the EU ETS

EUAA Aviation Allowance (EUAA)

European allowance that can only be held on accounts in the EU ETS. The unit which is allocated to aircraft operators is also included in auctions.

Certified Emission Reduction (CER)

International credit from CDM projects. Operators may exchange the unit type to an allowance if such an exchange right exists, see the section on the exchange of international credits.

The EU ETS does not allow CERs from certain projects. It is the buyer's responsibility to investigate whether the unit can be transferred to an account in the emissions trading system.

ERU (Emission Reduction Unit)

International credit from JI projects. Operators may exchange the unit type to an allowance if such an exchange right exists, see the section on the exchange of international credits. The EU ETS does not allow ERUs from certain projects. It is the buyer's responsibility to investigate whether the unit can be transferred to an account in the emissions trading system.

Unit types in the KP Registry

CER, ERU - See above.

AAU (Assigned amount unit)

The unit type assigned to the Kyoto Protocol, which has obligations to hand over units corresponding to their emissions, such as Sweden. Sweden allows private entities to keep the unit type on accounts in the Swedish registry under the Kyoto Protocol. However, this does not apply to all other countries' Kyoto registers.

lCER (Long Term Certified Emission Reduction)

International credit issued in Forest Planting Projects and Replanting Projects under CDM. The unit type has a limited life and is only valid during the Kyoto Protocol commitment period in which it was issued.

tCER (Temporary Certified Emission Reduction)

International credit issued in Forest Plant Projects and Replanting Projects under CDM. The unit type has a limited service life and expires at the end of the commitment period under the Kyoto Protocol following that in which it was issued.

RMU (Removal Unit)

Credit issued for greenhouse gas uptake in the so-called LULUCF sector.