Based on the EU Regulation on System Operation in Electricity, ACER published a Decision on the methodology for assessing the relevance of assets for outage coordination. The methodology was originally developed by all TSOs and sets out harmonised rules for all synchronous areas and describes in particular the influence computation method.
In December 2018, ACER became competent to decide on the methodology for assessing the relevance of assets for outage coordination. In line with this awarded competence, ACER introduced minor amendments to the TSO proposal in order to improve its legal clarity, having decided that there were a few instances where the methodology was unclear with regard to implementation planning. The most notable amendment to the methodology relates to the cycle for the re-assessment of assets for outage coordination, which was reduced to three years.