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ESO
European Network Codes (ENC)
The Third Energy Package of European legislation created a need for European Network Codes (ENC) to cover grid connections, markets and system operation. These codes are designed to provide a sustainable, secure and competitive electricity market across Europe.
For more information, please contact [email protected].
Recent Updates
5 Feb 2020: Following the publication of the NGESO documents in December last year (which describe enhancements to EDT and EDL, to support the TERRE market), National Grid has received feedback that has meant we’ve had to change the format of the RR Bid data in the EDT specification.
European Legislation
The Third Energy Package facilitates the development of a harmonised European internal energy market. It includes two directives and three regulations, which became law on 3 March 2011.
Joint European Stakeholder Group (JESG)
JESG covers the development, comitology process and implementation of ENCs. You can stay up to date with the latest ENC developments by signing up for the weekly JESG newsletter here.
Clean Energy Package (CEP)
The CEP is a suite of European legislation, which aims to decarbonise energy and facilitate better outcomes for consumers. It came into force during 2018/19 and covers the following areas: energy performance in buildings; renewable energy; energy efficiency; governance of the energy union; and electricity market design.
- You can now download our high-level impact assessment for electricity market design, which is the most recently ratified element of the CEP.
- Regulation (EU) 2019/943 of the European Parliament and of the Council of 5 June 2019 on the internal market for electricity: click here to access
- Directive (EU) 2019/944 of the European Parliament and of the Council of 5 June 2019 on common rules for the internal market for electricity and amending Directive 2012/27/EU: click here to access
- Regulation (EU) 2019/941 of the European Parliament and of the Council of 5 June 2019 on risk-preparedness in the electricity sector and repealing Directive 2005/89/EC: click here to access
- Regulation (EU) 2019/942 of the European Parliament and of the Council of 5 June 2019 establishing a European Union Agency for the Cooperation of Energy Regulators: click here to access
Commencement of ENCs
All ENCs have now come into force and are EU regulations in their own right. Implementation activities in Great Britain will continue for a number of years. There are eight ENCs required by the Third Energy Package, grouped into three areas: market guidelines, system operation, and grid connection.
Market guidelines
Capacity Allocation and Congestion Management (CACM)
Forward Capacity Allocation (FCA)
Electricity Balancing Guidelines (EBGL)
TERRE & Wider Access December 18 Update
Data Validation and Consistency Checking Issue 14
EDL Message Interface Specification Issue 5 (DRAFT)
EDT Message Interface Specification Issue 5
RR Implementation Guidelines v1.1
System operation
Grid connection
Requirements for Generators (RfG)
High Voltage Direct Current (HVDC)
Connection Code Introductory Videos
These videos tell you everything you need to know about the connection codes.