ENTSO-E Connection Network Codes_revised Implementation Guidance Documents_January 2023

Closed 16 Feb 2023

Opened 16 Jan 2023



According to Article 58 of Network Code Requirements for Generators (NC RfG), Article 56 of Network Code Demand Connection (NC DC) and Article 75 of Network Code High Voltage Direct Current (NC HVDC), ENTSO-E has the obligation to prepare non-binding guidance on implementation which shall be maintained every two years.

In the recent past, ENTSO-E produced (and when necessary improved later on) several Implementation Guidance Documents (IGDs) to support the national implementation of the Connection Network Codes (CNCs) in topics that were important and in cases complex. The list of topics that were elaborated included suggestions from stakeholders (discussed early 2016). Most IGDs were drafted by ENTSO-E while a few of them through established Technical Groups with the support of relevant stakeholders. Furthermore, several public workshops took place over the period between 2016 and 2018. 

All IGDs were publicly consulted as required by the CNCs and ENTSO-E replied to the consultation feedback. 

Final (current) published versions of the IGDs can be found HERE.

Last set of updated IGDs was published in 2021fulfilling the obligation of the two years’ maintenance.

Objectives of the IGDs

The IGDs are primarily addressed to the transmission system operators and other system operators concerning the elements of the codes requiring national decisions. They shall explain the technical issues, conditions and interdependencies which need to be considered when complying with the requirements of these Regulations at national level.

The objectives of the implementation guidance documents are:

  • to facilitate a common understanding of technical issues specified in the connection network codes, in context of new technologies and new requirements
  • to deliver broader explanations and background information and to illustrate interactions between requirements
  • to recommend coordination/collaboration between network operators (TSO) where either explicitly required by the connection codes or reasonably exercised from a system engineering perspective
  • to give guidance to national specifications for non-exhaustive requirements, and
  • to express the need of further harmonisation beyond what is requested by the CNCs when reasonable from a system engineering perspective.

Status of the revisions

The first set of the revised IGDs includes:

  • additional clarifications that were provided during the exchanges with stakeholders, mainly at Grid Connection European Stakeholder Committee level. ENTSO-E has been asked through Q&As to detail some aspects further and doing so the subsequent decision was to ensure consistency of ENTSO-E’s position/reply in different publicly available material.
  • needed editorial changes and format changes that were necessary considering the different publication time.   

The current IGD consultation is scheduled as follows:

16 January 2023 – 16 February 2023 – ENTSO-E publishes two (2) draft revised IGDs for consultation (please see below). The comments received will support the finalisation of the IGDs. 

A preview of all the questions in this consultation can be accessed HERE.

The revised IGDs under consultation are listed below:

  1. IGD on Compliance Verification - Using Electrical Simulation Models LINK
  2. IGD on Compliance Verification - Compliance Monitoring after final operational notification LINK 

For any additional comments please download the Excel File named "Consultation IGDs" HERE. It can be uploaded further in Question 3 under each IGD.

Why your views matter

ENTSO-E is consulting the IGDs for three main reasons:

  1. Although the main addressees of the IGDs are the system operators, the connection codes have a significant impact on manufacturers, power generating module operators, demand facilities and distribution networks.
  2. The IGDs are drafted as supporting material for the connection codes implementation at the member state level and shall aim to give guidance for national specifications. 
  3. The IGDs are legally requested to be consulted with stakeholders before their release.

What happens next

After the end of the consultation period, ENTSO-E and the relevant drafting team will consolidate the comments and consider them for the improvement of the IGDs.

Reply to the consultation will be provided as soon as possible together with the final version of the IGDs.

The planned period for publication is end of May.


  • ENTSO-E stakeholders
  • TSOs


  • Connection Network Codes
  • General