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Glossary · Energy industry & energy transition

ENTSO-E

ENTSO-E transmission system operator European interconnected grid network codes TYNDP electricity market grid operation

ENTSO-E stands for European Network of Transmission System Operators for Electricity. It is the European association of operators of electricity transmission systems. According to its own information, ENTSO-E brings together 40 transmission system operators from 36 countries. Its members operate the extra-high-voltage grids and are responsible for the secure operation of their grids and control areas. ENTSO-E itself does not operate a power grid, does not sell electricity and is not a regulatory authority. The association coordinates tasks in the European power system that do not end at national borders. These include common operating rules, the calculation of cross-border capacities, market integration, the publication of data, security-of-supply analyses and long-term network planning.

Origins and legal mandate

Cooperation between grid operators dates back to the 1950s, when the first synchronous interconnected systems and interconnectors were established. This gave rise to several regional associations, which were later merged into ENTSO-E. With the EU's Third Internal Energy Market Package of 2009, ENTSO-E was given tasks defined by law. Today, the Internal Electricity Market Regulation (EU) 2019/943 is the relevant legal basis. Under Article 28, the transmission system operators cooperate at Union level within ENTSO-E, referred to as "ENTSO (Strom)" in the German text of the regulation. Article 30 lists its mandatory tasks. ENTSO-E is therefore more than a voluntary interest association. At the same time, however, the association also sees itself as the common voice of the grid operators.

Technical foundation: the European interconnected grid

The need for this coordination has physical reasons. Large parts of Europe form an interconnected grid made up of several synchronous areas. Within a synchronous area, the grid oscillates everywhere at the same grid frequency, nominally 50 hertz in Europe. One can imagine it as many people swinging a heavy rope together in rhythm: if one lets go or pulls too hard, everyone feels it. Generation and consumption must therefore remain in constant balance. If a large power plant fails somewhere, the frequency drops across the entire synchronous area. Balancing energy is then activated, often across borders as well. If a line between two countries is heavily loaded or unplanned loop flows occur, this usually affects several grid operators at the same time.

A recent example shows how important this level is. On 8 February 2025, Estonia, Latvia and Lithuania disconnected from the Russian-controlled IPS/UPS grid system. On 9 February 2025, their grids were synchronised with the Continental Europe synchronous area. The decision was taken by the Regional Group Continental Europe within ENTSO-E. After a trial phase, the continental European grid operators confirmed in November 2025 that the connection is permanent and the project is complete. The example shows that membership of a synchronous area is determined by technical connection conditions and coordination among grid operators, not by political borders alone.

Core tasks under EU law

Article 30 of Regulation (EU) 2019/943 names, among others, the following tasks (as at: original 2019 version):

  • Network codes: ENTSO-E prepares drafts of European network codes, for example on system operation, capacity allocation, the balancing market and connection requirements for generation and consumption facilities. They only become binding once the European Commission adopts them as a regulation.

  • Network development plan: Every two years, ENTSO-E adopts and publishes the Union-wide, expressly non-binding ten-year network development plan, the TYNDP.

  • Security of supply: Each year, ENTSO-E carries out the European resource adequacy assessment (ERAA). Seasonal analyses, for example for winter and summer, are added to this.

  • Operational coordination: The association provides common tools for normal and emergency operation, including a uniform scale for classifying incidents. It also sets out a framework for cooperation among the regional coordination centres.

  • Further tasks: cooperation with distribution system operators and the EU DSO Entity, promotion of digitalisation and cybersecurity, participation in rules on data access, consideration of demand response, and an annual work programme and annual report.

For many of these tasks, ENTSO-E must carry out consultations. ACER monitors whether the tasks are fulfilled and issues opinions, among other things on the draft network development plan. ENTSO-E's Transparency Platform is also well known. It publishes data on load, generation, transmission capacities and balancing energy from across Europe.

Distinction from ACER, the Commission and power exchanges

ENTSO-E is often confused with ACER, the EU Agency for the Cooperation of Energy Regulators. ENTSO-E represents the grid operators and provides technical drafts, methods and reports. ACER is an EU agency. It monitors ENTSO-E's work, issues opinions and in certain cases decides itself, for example when national regulatory authorities cannot agree on common methodologies. The European Commission proposes or adopts legal acts, for example the network codes as regulations. ENTSO-E is therefore not a legislator. However, the association has a significant technical influence on shaping the rules.

ENTSO-E must likewise be distinguished from power exchanges and market coupling operators. The exchanges organise the trading of electricity products. The transmission system operators ensure that electricity can physically flow, and they limit trading when lines reach their security limits. ENTSO-E and its members develop the methods used to calculate the available cross-border transmission capacity and make it available to the market. In this way, ENTSO-E shapes the electricity market without being a market participant in the usual sense itself.

Transmission and distribution level

Distribution system operators operate the regional and local grids. Households, many commercial businesses, charging points, heat pumps, photovoltaic systems and smaller storage units are connected there. They are not members of ENTSO-E but are organised at EU level in the EU DSO Entity. Technically, however, the two levels are growing together: when many decentralised installations feed in or draw electricity at the same time, this affects the balance, the congestion and the stability of the transmission grid. The regulation therefore obliges ENTSO-E and the EU DSO Entity to cooperate closely, for example on data and analyses.

Network planning with the TYNDP

ENTSO-E is most visible to the outside world in European network planning. The TYNDP describes the longer-term expansion needs of the European transmission grid. It covers lines, interconnectors, offshore grids, storage and other flexibility options, in each case on the basis of scenarios for generation and consumption. The plan is not legally binding and is not a construction programme. It forms a common planning basis, for example for cost-benefit analyses and for the selection of projects of common interest. Permitting, financing, local acceptance and regulatory decisions are separate steps at national and European level.

Why coordination is becoming more important

Electricity flows according to the physical laws of the grid, not according to trading contracts. This gives rise to congestion, loop flows and the need for redispatch and reserves. With the expansion of wind and solar energy, where and when electricity is fed in is changing. A lot of wind power in the north-west, photovoltaic peaks in the south and more demand from heat pumps, electromobility and electrified industry shift the load flows. For security of supply, it is therefore not enough for a country to have sufficient power plant capacity on paper. It is also decisive whether the electricity can be transported at the right time over the existing grids. This Europe-wide view is precisely what the ERAA is meant to provide. The interconnected grid can also reduce risks: regions support one another, share reserves and balance out different generation profiles. However, this only works with coordinated rules.

Common misunderstandings

  • ENTSO-E is not a European grid control centre. Each transmission system operator runs its own grid. Coordination takes place through common security rules, operational processes and regional coordination centres. Operational responsibility remains with the grid operators and the competent national bodies.

  • ENTSO-E is not synonymous with the EU. Its members also include grid operators from countries outside the EU that are closely connected to the European grid. The Ukrainian grid operator Ukrenergo, for example, has been a full member since January 2024. Conversely, membership of a particular synchronous area depends on physical coupling and the technical connection conditions.

  • ENTSO-E does not adopt network codes definitively. The association provides drafts and methods. They become legally binding through the Commission, the regulatory authorities and ACER.

ENTSO-E thus stands for a specific level of the power system: the common order of the transmission system operators in a Europe that is physically interconnected and interwoven through the market. The term alone explains neither the electricity price nor grid expansion nor security of supply. However, it designates the place where many technical methods, planning foundations and coordination rules of the European power system converge.

Sources

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Edited by eCMS on 11.11.2026 19:47

© 2026 Erik Schmidt. All rights reserved. Quotations with a link to the source are welcome.