proxy data
as defined in Commission Implementing Regulation (EU) 2018/2066 of 19 December 2018 on the…, Article 3, point (59) (Definitions)
annual values which are empirically substantiated or derived from accepted sources and which an operator uses to substitute the activity data or the calculation factors for the purpose of ensuring complete reporting when it is not possible to generate all the required activity data or calculation factors in the applicable monitoring methodology;