Every holder of an account in the Danish EU ETS Registry may trade with CO2 emission allowances between accounts in the EU ETS Registry. Since September 21st, 2020, it has also been possible to transfer CO2 allowances between the EU ETS Registry and the Swiss Emission Trading Registry. The allowances which can be traded are EU General Allowances (EUA), EU Aviation Allowances (EUAA), Swiss General Allowances (CHU) and Swiss Aviation Allowances (CUHA).
As a default, there are no limits to the volume of a transaction, but it is possible for account holders to set limits for transactions in the EU ETS Registry. It is not possible to transfer more emission allowances than are held in an account. No service charges are linked to the individual transactions, but an annual service charge for each account is payable to the Danish Business Authority.
Account holders must enter into their own agreements concerning price; allowance volume; transaction date, etc., with the party with whom they wish to trade. Financial transactions relating to the purchase and sale of emission allowances are to take place outside the registries and do not have to be notified to the Danish Business Authority. In this context, the sole purpose of the registries is to register ownership of the emission allowances.
| OHA | AOHA | MOHA | TA | |
| EUA | X | X | X | X |
| AEUA | X | X | X | X |
| CHU | X | X | X | X |
| CHUA | X | X | X | X |