The Regulation on guidelines for trans-European energy infrastructure (TEN-E Regulation) was first introduced in 2013 to facilitate the development of European energy networks.

The Regulation was revised in 2022 to align with the goals of the European Green Deal and introduced the concept of projects of mutual interest (PMIs) alongside the existing projects of common interest (PCIs). These are key cross-border infrastructure projects designed to improve network connections between EU Member States (PCIs) or with non-EU countries (PMIs). These projects benefit from accelerated permitting procedures and funding, as they are key to achieving the EU’s energy and climate objectives.

The European Commission is responsible for selecting and publishing a list of these projects every two years (known as the Union list). In 2024, the Commission published the first Union list including both PCIs and PMIs.

ACER monitors and evaluates the implementation progress of PCIs and PMIs based on reports submitted by project promoters and national competent authorities.

In May 2025, ACER published its first interactive dashboard presenting the monitoring findings for both PCIs and PMIs.

Pursuant to Article 59(1) of EB Regulation, ENTSO-E shall publish a European report focusing on monitoring, describing and analysing the implementation of EB Regulation, as well as reporting on the progress made concerning the integration of balancing markets in Europe.

The format of the report shall vary as follow:

(a) two years after entry into force of this Regulation and subsequently every second year a detailed report shall be published;

(b) three years after entry into force of this Regulation and subsequently every second year a shorter version of the report shall be published to review the progress made and update the performance indicators.

No actions have been completed yet with regard to this topic.​

Pursuant to Article 60 of EB Regulation, at least once every two years, each TSO shall publish a report on balancing covering the previous two calendar years, which shall either be in English or at least contain an executive summary in English. The Agency plans to gather and publish these reports.

No actions have been completed yet with regard to this topic.​

The European Union Agency for the Cooperation of Energy Regulators (ACER) and the Council of European Energy Regulators (CEER) have published today a joint paper including recommendations ahead of the upcoming revision of  the Guidelines for trans-European energy infrastructure Regulation (TEN-E Regulation).

The proposals focus on infrastructure development governance, scope and process. The Europe​an Commission intends to review and to revise the Regulation before the end of 2020 as one of the initiat​​ives of the European Green Deal and it is currently consulting with stakeholders and regulators. This paper serves as a response to the public consultation​ as well. 

Based on the extensive experience on the benefits and shortfalls of the current TEN-E Regulation, national regulatory authorities (NRAs) and ACER propose legislative changes to improve the planning and implementation of electricity and gas infrastructure, aiming to make it streamlined, focused on sustainability and neutral both in terms of technology and potential conflict of interest. ​

In the paper, ACER and CEER p​​​​​​​​​​ropose specific recommendations in the following three areas: 

• ​governance of infrastructure development
• scope of principles for Projects of Common Interest
• TEN-E processes.​​​

The European Commission is developing legislative proposals (as part of the Grids Package) to improve and simplify the current legal framework. This includes the revision and simplification of the 2022 Trans-European Energy Networks Regulation (TEN-E Regulation), a key framework for the European energy infrastructure development. 

On 19 September 2025, ACER published a position paper on improving and simplifying the legal framework on European grids.

Board of Regulators

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Administrative Board

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Board of Appeal

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Electricity Working Group

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Gas Working Group

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ACER REMIT Committee

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ACER Retail Market Working G​roup

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Task Forces – Under the Electricity Working Group

Balancing

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Capacity Allocation and Congestion Management Task Force

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​​Forward Capacity Allocation

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Future Policy & Governance TF

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Infrastructure

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Security of Supply TF

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System Operation and Grid Connection

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Cybersecurity Task Force

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Compliance and Enforcement

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Task Forces – Under the Gas Working Group

Balancing

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Capacity Allocation Mechanism

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Infrastructure

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Interoperability

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Tariffs

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Gas Target Model

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Hydrogen Markets and Regulation

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Task Forces and Standing Committees – Under the ACER REMIT Committee

(Archived) REMIT IT Management & Governance

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REMIT Policy Task Force

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​​Market Data Standing Committee

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(Archived)​ Market Data Reporting Standing Committee

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Market Monitoring Standing Committee

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RISIG

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Task Forces – Under the Retail Working Group​​

​Market Monitoring Task Force

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Gas Regional Initiatives 

Gas Regional Initiatives - Coordination Group

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Gas Regional Initiatives - South Region

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Gas Regional Initiatives - South south east Region

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​Others task forces and groups

Joint Electricity and Gas Infrastructure Task Force

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LEN (Legal Experts Network)

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Communication Officer

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NRA Press Network

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As the Regulations do not foresee approvals by more than one regulatory authority, the Agency will not be asked to adopt decisions when regulatory authorities cannot agree on terms, conditions and methodologies.​

RfG Implementation​

The Agency monitors the procedure of granting derogations from one or more provisions of the RfG Regulation.

The relevant regulatory authority decides which power-generating modules should be classified as an emerging technology. Any regulatory authority of the relevant synchronous area may request a prior opinion from the Agency, which shall be issued within three months after receiving the request. The decision of the relevant regulatory authority shall then take into account the Agency's opinion.

All regulatory authorities of a synchronous area may also decide in a coordinated manner to withdraw a classification as an emerging technology. Also in this case, the regulatory authorities of the synchronous area concerned may request a prior opinion from the Agency, which shall be issued within three months. Where applicable, the coordinated decision of the regulatory authorities shall take into account ACER's opinion.

Find out more on how national regulatory authorities implemented the transitional arrangements for emerging technologies in the Implementation Monitoring Report of the Network Code on Requirements for Grid Connection of Generators. 

The accumulated sales of power-generating modules classified as emerging technology are also made available by the national regulatory authorities every two months.

The Agency monitors the procedure of granting derogations from one or more provisions of the DCC Regulation. The Agency may issue a reasoned recommendation to a regulatory authority to revoke a derogation, in case justification is missing.​

The Agency monitors the procedure of granting derogations from one or more provisions of the HVD​C Regulation. The Agency may issue a reasoned recommendation to a regulatory authority to revoke a derogation, in case justification is missing.​​