The Commissie voor Boekhoudkundige Normen – Commission des Normes Comptables has issued an interpretation on the accounting treatment of Emission Rights in August (Interpretation 179-1 De boekhoudkundige verwerking van broeikasgasemissierechten – Le traitement comptable des quotas d’émission de gaz à effet de serre).
The Interpretation recommends that the emission rights are accounted for in either of two methods:
You can retrieve 179-1 CBN interpretation here in French or in Dutch.