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 North West (NW) region has been inactive since 2014. Cooperation continues on a bilateral or multilateral basis, outside the setting of the GRI.

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The region was formed by the following countries:

• Belgium

• Denmark

• France

• Germany

• Ireland

• Luxemburg

• Netherlands

• Sweden

• United Kingdom

• Norway (observer, non-EU country)

The region produces, and consumes, the highest amount of gas in Europe. The region also hosts the most developed gas markets and hubs in the EU.

The South South-East (SSE) region includes 20 countries: 12 EU Member States, plus 8 Energy Community Contracting Parties.

The South South-East Gas Regional Initiative is composed of:

• Austria

• Bulgaria

• Croatia

• Cyprus

• Czech Republic

• Greece

• Hungary

• Italy

• Poland

• Romania

• Slovakia

• Slovenia

Participating Energy Community Contracting Parties:

• Albania

• Bosnia and Herzegovina

• Kosovo

• Former Yugoslav Republic of Macedonia

• Moldova

• Montenegro

• Serbia

• Ukraine

The region is co-chaired by ERC and E-Control (respectively the North Macedonian and Austrian energy regulator).

The participation of the Energy Community in the GRI SSE is the result of an intensified cooperation started in 2014. Since then, the Energy Community Secretariat has joined the meetings together with the Contracting Parties.​​

The South Gas Regional Initiative is composed of:

• Spain

• Portugal

• France

The Spanish Commission for Markets and Competition (CNMC) leads the Initiative, whose long-term goal is to integrate France, Portugal and Spain into a single regional gas market. ​

Moving forward the further integration of the Spanish and Portuguese markets, Transmission System Operators have proposed a new algorithm to offer cross-border day-ahead interruptible capacity as bundled product.

​​​​The Baltic Regional Gas Market Coordination Group is composed of:

• Finland

• Estonia

• Latvia

• Lithuania​

​The first Regional Gas Market Coordination Group (RGMCG) Action Plan began on 2017 with the implementation of the implicit capacity allocation of the interconnection points between Latvia-Lithuania and Estonia-Latvia. It provided the organised market place where gas could be easily traded cross-border, while at the same time minimising the administrative burden of potentially having third party access (TPA) and balancing agreements between Transmission System Operators (TSOs).

In 2018, the tariff model and inter-TSO compensation (ITC) mechanism for the common Baltic-Finnish market was created, resulting in a stepwise integration approach.

The NRAs of Finland, Estonia and Latvia (FinEstLat) agreed to strengthen their cooperation by creating the FinEstLat market, which became operational on 1 January 2020.

The FinEstLat single natural gas transmission entry-exit system, also called the 'FinEstLat system', has specific characteristics.

The NRAs have amended the methodologies for calculating the transmission tariffs and approved the tariff scheme, which became applicable as of 1 January 2020. ACER published its analyses of the consultation documents of the Estonian, Latvian, Lithuanian and Finnish ​reference price methodologies.

Two balancing areas are set up in the FinEstLat system, considering the different level of market maturity in the FinEstLat countries: the common Estonian-Latvian balancing zone and the Finnish balancing zone.

The Regional Gas Market Coordination Group (RGMCG) continues working on a four-country market model, including Lithuania into the regional market.​​​​

Following the Roadmap approved in early 2020:

• In March 2020: the Common Regulations for the Use of Natural Gas Transmission System were amended eliminating the inconsistencies that arose during the first months of operating Estonia-Latvia common balancing zone.

• In April-August 2020: external analysis was carried out by Artelys to support a four-country entry tariff area and to design and justify an ITC-model for the four countries that is compliant with all the requirements.

• In May-August 2020: the TSOs jointly conducted an analysis for further integration options and concluded that full market integration should be decided upon only after operational efficiency is significantly improved (internal congestion eliminated), i.e. after 2024 when PCI “Enhancement of Latvia-Lithuania interconnection” is completed.

• ​In August 2020: the region started to develop the Solidarity agreement based on the Regulation safeguarding the security of gas supply.

• ​In October 2020: a Memorandum of understanding was signed between the four NRAs to facilitate cooperation, coordination and the creation of the Baltic-Finnish market. A Working Group with the four NRAs was also established.

• ​In December 2020: the regional TSOs scrutinized the benefits of a common system for issuing and trading guarantees of origin for gre​en gases.

Following the mandate of the European Commission, the gas regions elaborated regional Work Plans. These outline the main projects and activities to be developed at regional level and serve as the main implementation reference. All projects clearly indicate and plan the deliverables, the deadlines, and responsible parties involved. ​
 

The currently adopted Wo​rk Plan of the So​​uth region focuses on:

• Infrastructure
• Market integration
• Decarbonisation 

The currently adopted Work Plan of the South South East (SEE) region focuses on:

• Decarbonisation package
• Survey on gas quality
• Survey on gas storage and LNG​​
   

The North-West region has been inactive since 2014.

Whenever needed, the Agency provides guidance and coordinates the updates of the Work Plans, suggesting an effective and coherent planning.

The Gas Regional Initiatives (GRIs) bring market participants together to test solutions for cross-border issues and to develop pilot projects that can be exported to other regions.

The European internal gas market has been divided in four main regions:​

• South GRI

• South South-East GRI

• North-West (currently inactive)

• Regional Gas Market Coordination Group​ (Baltic Region) (informally joined the initiative in 2018)

The Initiatives have contributed to noticeable developments in different areas such as capacity allocation, infrastructure development and market integration.

Progresses were possible thanks to effective stakeholders' engagement ensured in different fora:

• Regional Coordination Committee (RCC) 

​Composed by all NRAs of the region, it coordinates, facilitates and drives forward the regional priority projects. The European Commission and national governments may provide useful input to identify and solve specific issues.

• Implementation Group (IG) 

​Includes the relevant infrastructure operators (transmission systems, interconnectors, LNG and storage facilities) and provides a technical framework for implementing effective solutions.

• Stakeholders Group (SG) 

​All other key market participants and consumers are brought together in each region to engage in the discussions.

The Regional Initiatives developed regional Work Plans and cross-regional Roadmaps (in cooperation with ENTSOG), in order to promote the implementation of the Network Codes and market integration. ​

​​​ACER monitors the effective implementation of the Capacity Allocation Mechanisms Network Code and shares its findings in a dedicated report. ​

Capacity allocation provides mechanisms to obtain capacity products from transmission system operators. It is usually underpinned with a capacity contract between the network user and the network operator. ​​

​Previous capacity allocation methods did not provide equal and transparent access to potential entrants to the capacity markets, hindering competition.

​Equal and transparent access to transmission capacity in the EU is not a major obstacle anymore. The progressive reduction of the old capacity contracts and their gradual replacement with new ones addressed most of the existing constraints.​​​

ACER monitors the effective implementation of the Congestion Management Procedures Guidelines and shares its findings in specific reports. ACER also reports on an annual basis on the status of Congestion at Interconnection Points. On this occasion ACER also checks the transparency of the data published on the ENTSOG Transparency Platform and provides guidance on possible improvements. ​
 

What is congestion management? 

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Contractual congestion occurs when network users cannot obtain the capacity products of their choice because the capacity demand exceeds the offer. It is different from physical congestion, where technical capacity is used to its full extent. Several measures exist to mitigate and prevent contractual congestion.​​
 

Why is congestion management important?

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Congestion management procedures address congestions and improve market efficiency. National regulatory authorities and transmission system operators can decide on the application of these measures.
 

What does ACER say?

The Agency reports annually on the status of contractual congestion in EU gas markets and how congestion is managed. Based on the​​ monitoring results, national regulatory authorities can decide on the application of congestion management procedures.

ACER provides analyses and case studies in yearly reports about the national implementations on congestion management procedures, evaluating their effects at European level.

The Agency published its first Implementation Monitoring Report on Gas Congestion Management Procedures in 2015 and provided an update a year later. The Agency found incomplete implementation and limited application of congestion management in both years and has continued to promote the usage of congestion management instruments ever since. ​​​​​