The implementation of European legislation is done on national, regional, and pan-European levels and often in combination. TSOs, as well as DSOs, market participants and regulators at the EU, regional and national levels, are involved in various ways. In some cases, Network Codes or primary legislation define clear and detailed roles for specific bodies/entities; in others, legal provisions are less detailed and require an additional layer of text to define roles and processes.

ENTSO-E is responsible for the monitoring of the implementation of Network and Guidelines, as defined by the legal provisions of the latter. To fulfil this obligation, ENTSO-E elaborates monitoring plans and publishes reports. It also collects data, (termed ‘lists of information’), and designs and implements interfaces for data collection. Based on new provisions under Regulation (EU) 2019/943, ENTSO-E will further cooperate with the future EU DSO entity on the monitoring of the implementation of possible new Network Codes and Guidelines. These will be adopted pursuant to this Regulation and are relevant to the operation and planning of distribution grids and the coordinated operation of the transmission and distribution networks.

ENTSO-E and ACER have signed an agreement for data collection and provision to ACER. This agreement is currently being used at first for the monitoring of the CACM and then should be extended to other network codes and guidelines.