1. For the purposes of this Regulation, the following definitions shall apply:

(1) "average activity level" means, for each sub-installation, the arithmetic mean of the related annual activity levels for the two calendar years preceding the submission of a report referred to in Article 3(1);

(2) "incumbent installation" means incumbent installation as defined in Article 2(1) of Delegated Regulation (EU) 2019/331;

(3) "heat benchmark sub-installation" means heat benchmark sub-installation as defined in Article 2(3) of Delegated Regulation (EU) 2019/331;

(4) "fuel benchmark sub-installation" means fuel benchmark sub-installation as defined in Article 2(6) of Delegated Regulation (EU) 2019/331;

(5) [deleted]

(6) [deleted]