This data is updated by the facility operators on 15th November of every year. In addition, this data is also updated if changed data is reported by facility operators in the course of the year.

The energy capacity corresponds to the maximum energy stored which is available if the storage facility is full; whilst considering all technical and water legislation restrictions known at the time of reporting. This information is updated by the facility operators by 15h November of every year. Updating during the year is not required.