Joined Cases C-281/23 P and C-282/23 P: Judgment of the Court (Second Chamber) of 23 October 2025 – Polskie sieci elektroenergetyczne S.A., RTE Réseau de transport d’électricité, Svenska kraftnät, TenneT TSO BV v European Union Agency for the Cooperation of Energy Regulators (ACER) (Appeal – Internal market for electricity – Regulation (EU) 2019/942 – Board of Appeal of the European Union Agency for the Cooperation of Energy Regulators (ACER) – Regulation (EU) 2017/2195 – Articles 20, 21 and 37 – Balancing electricity – Transmission system operators – Establishment of European platforms for the exchange of balancing energy – European platform for the exchange of balancing energy from frequency restoration reserves with manual activation (mFRR platform) – European platform for the exchange of balancing energy from frequency restoration reserves with automatic activation (aFRR platform) – Development and approval of the implementation frameworks for those platforms – Functions required to operate those platforms – Cross-zonal capacity for the exchange of balancing energy – ACER decision rejecting the common proposal of the system operators)
Date: 2025-10-23
Institutions: Court of Justice
Subjects: electrical energy, energy distribution, energy grid, energy market, energy storage, security of supply, trans-European network








C_202506471EN.000101.fmx.xml












Official Journal of the European Union


EN
C series













C/2025/6471


15.12.2025






Judgment of the Court (Second Chamber) of 23 October 2025 – Polskie sieci elektroenergetyczne S.A., RTE Réseau de transport d’électricité, Svenska kraftnät, TenneT TSO BV v European Union Agency for the Cooperation of Energy Regulators (ACER)


(Joined Cases C-281/23 P and C-282/23 P)
                (1)

(Appeal - Internal market for electricity - Regulation (EU) 2019/942 - Board of Appeal of the European Union Agency for the Cooperation of Energy Regulators (ACER) - Regulation (EU) 2017/2195 - Articles 20, 21 and 37 - Balancing electricity - Transmission system operators - Establishment of European platforms for the exchange of balancing energy - European platform for the exchange of balancing energy from frequency restoration reserves with manual activation (mFRR platform) - European platform for the exchange of balancing energy from frequency restoration reserves with automatic activation (aFRR platform) - Development and approval of the implementation frameworks for those platforms - Functions required to operate those platforms - Cross-zonal capacity for the exchange of balancing energy - ACER decision rejecting the common proposal of the system operators)
(C/2025/6471)
Language of the case: English

Parties


Appellants: Polskie sieci elektroenergetyczne S.A., RTE Réseau de transport d’électricité, Svenska kraftnät, TenneT TSO BV (represented by: B. Byrne, advocaat, D. Jubrail, Solicitor, and M. Levitt, avocat)

Other party to the proceedings: European Union Agency for the Cooperation of Energy Regulators (ACER) (represented by: P. Martinet, A. Tellidou and E. Tremmel, acting as Agents, and by E. Abril Fernández, E. Ameye, abogados, and M. de Sousa Ferro, advogado)

Operative part of the judgment

The Court:






1.


Dismisses the appeals;










2.


Orders Polskie sieci elektroenergetyczne S.A., RTE Réseau de transport d’électricité, Svenska kraftnät and TenneT TSO BV to pay the costs.






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            OJ C 261, 24.7.2023.


ELI: http://data.europa.eu/eli/C/2025/6471/oj
ISSN 1977-091X (electronic edition)