​ACER supports and actively contributes to the decarbonisation of the European gas sector. By ensuring efficient decarbonisation and competition measures, costs can be limited and consumers can benefit from lower prices. This is possible thanks to the work of national regulators, the European Commission, ACER and stakeholders who have been cooperating for more than ten years to integrate and create a pan European gas market, comprising also the Energy Community Contracting Parties.

What is the role of ACER?

Building upon the sustained efforts of National Regulatory Authorities (NRAs) and the continuous support of all stakeholders, ACER's Gas Department is working towards meeting all the challenges associated with creating a well-functioning, competitive, integrated, secure and sustainable European gas market, delivering tangible benefits to the European consumers. Work still to be done includes aligning national market and network operation rules for gas as well as making cross-border investment in energy infrastructure easier.

To achieve these goals, ACER Gas Department has organised its activities in three teams:

• Network Codes

• Market Monitoring

• Infrastructure

Network Codes

​The Network Codes (NCs) are the fundamental rules regulating the efficient transmission of gas across Europe. They turn regulatory policies for cross-border and market integration issues into operational rules. ACER is responsible for drafting the initial framework guidelines that guide the European Network of Transmission System Operators for Gas (ENTSOG) and the European Commission in drafting and approving the Codes. The team is also responsible for issuing decisions, recommendations, opinions and NC implementation reports.

Gas Network Codes Functionality Platform

The Joint Functionality Process for Gas Network Codes was jointly set up by ACER and ENTSOG in 2016. The platform allows market parties to notify operational issues related to the gas Network Codes and their implementation.

The gas infrastructure team deals with various aspects of the development and the efficient, safe and secure operation of the gas industry infrastructure: pipelines, compressor stations, liquefied natural gas terminals and underground gas storage. ACER contributes to assessing how gas infrastructure developments may influence market integrity, competition, security of gas supply and sustainability. To do so, ACER works closely with NRAs, ENTSOG, project promoters, and the European Commission. The team also often liaises with colleagues from the Energy Community and other European entities.

The Agency closely monitors and assesses the development of the gas infrastructure in Europe through several activities, including the development and the implementation of the EU-wide 10-year network development plans (TYNDPs), gas regional investment plans (GRIPs), national infrastructure development plans (NDPs), and the selection of projects of common interest (PCIs). In all these domains, ACER provides Opinions, Recommendations or reports to advise and inform relevant stakeholders.

​Accurate monitoring is crucial to track the progress towards meeting the challenges of creating a well-functioning, competitive, integrated, secure, and sustainable European internal energy market. The Gas Market Monitoring team analyses the trends of:

• EU gas wholesale markets and the impact of Network Codes on its functioning,

• Retail energy markets, focusing particularly on price-related issues, as well as the status of consumer rights, empowerment and protection in the European energy market.

As a result of this intensive analysis, ACER produces an annual Market Monitoring Report​ (MMR). The report is considered by stakeholders as a reference to appraise the status of the European energy markets and to develop a sound energy policy. The MMR also identifies barriers to the completion of the internal gas market and recommends measures to overcome them.

​​​​​​The European energy sector is engaged into a profound energy transition, whose overall success highly depends on the efficiency and integration of the European electricity markets.

Since the Directive on common rules for the internal market in electricity (1996), which marked the beginning of the market integration process at the European level, significant progress has been made towards establishing an efficient Internal Electricity Market. The successive legislative packages (and more recently the Clean Energy Package) contributed to further strengthening the foundations of the Internal Electricity Market.  ​

Despite this progress, there are still numerous obstacles to overcome before achieving a truly integrated efficient market. 

Among these: the full implementation of the Network Codes and Guidelines developed since 2011 (constituting the backbone of the Internal Electricity Market) and the efficient and secure integration of renewables' intermittent generation.

Building upon the sustained efforts of National Regulatory Authorities (NRAs) and the continuous support of all stakeholders, ACER's Electricity Department is committed to meeting all these challenges. ​

To better support the market integration process, the Department has organised its activities into five teams:

• The Market Codes team is responsible for developing, implementing and monitoring the European market rules.

• The Grid Connection and System Operations team develops, implements and monitors the grid connection and system operation rules harmonised at European level.

• The Market Monitoring team is in charge of identifying the barriers to the well-functioning of the European electricity markets.

• The Infrastructure team ensures an efficient and transparent network development.

• The Adequacy team is responsible for the development, implementation and monitoring of sound and transparent methodologies identifying resource gaps in Europe.​​

We are looking for a Human Resources Officer – Data & Processes to strengthen our data-driven HR function and support the continuous improvement of workforce planning, reporting, and HR operational processes.

In this role, you will contribute to the development of reliable HR analytics, performance metrics, and executive reporting, enabling evidence-based decision-making and organisational planning. You will play a key role in maintaining and analysing HR data, supporting the implementation of modern reporting tools, and helping drive the digital transformation of HR processes across the Agency. Additionally, you will coordinate trainee and graduate programmes, supporting recruitment, onboarding, development activities, and programme evaluation.

Reference: ACER/2026/03

Published: 5 February 2026

Deadline to submit applications: 5 March 2026, 14:00 CET

We are looking for a Human Resources Officer to lead the development of policies and workforce strategies while ensuring strict compliance with regulatory frameworks and EU Staff Regulations. 

In this role, you will provide strategic advisory support to senior management across the full employee lifecycle, driving modern talent management and performance processes. Additionally, you will oversee HR analytics and executive reporting to deliver data-driven insights that enhance organizational governance and operational efficiency.

Reference: ACER/2026/02

Published: 5 February 2026

Deadline: 5 March 2026, 14:00 Ljubljana Time

We are looking for a Policy Officer – Security of Supply with expertise in analysis and modelling of the power system with a focus on security of supply and supply adequacy. The candidate  will also have experience in leading complex projects and working with diverse stakeholders.

In this role, you will have the opportunity to play a crucial role in contributing to the tools, solutions and oversight related to the assessments of the European energy system needs. 

Reference: ACER/2026/01

Published: 27 January 2026

Deadline: 24 February 2026, 14:00 Ljubljana Time

The Agency may offer positions to experienced and highly-motivated Seconded National Experts (SNE), who will work together with the Agency’s staff.

No deadline for applications

Reference: ACER/SNE/2023/OC

Are you a strongly motivated, highly qualified and competent young professional? If your answer is yes, you landed in the right place.

ACER traineeship programme aims to attract university graduates who are interested in developing professionally by embarking on an exciting learning opportunity.

No deadline to apply.

You can be contacted at any time to join us for March or September semester.

Reference: ​ ACER/TRAINEE/2024/OC

The ACER graduate programme aims to attract graduates with a completed Master Degree and PhD students who are interested in developing professionally by embarking on an exciting learning opportunity in EU energy regulation in its offices in Ljubljana, Slovenia.

The aim is to create a pool of fresh talent capable of contributing to core ACER tasks and policy and creating a bridge with the latest academic insights.

No deadline to apply.

Reference: ​ ACER/GRADUATE/2023/OC

The European Union Agency for the Cooperation of Energy Regulators (ACER) was established in March 2011 (Third Energy Package legislation) to foster cooperation among the EU’s energy National Regulatory Authorities (NRAs) and help ensure that a single Eu​​ropean market for electricity, and similarly natural gas​, functions well. ACER's headquarters are in Ljubljana, Slovenia. 

ACER is one of the EU decentralised agencies. Distinct from the EU institutions, agencies are set up as separate legal entities to perform specific technical and scientific tasks that help the EU institutions and Member States to implement policies and take decisions. EU agencies support the cooperation between the EU and national governments by pooling technical and specialist expertise. Besides working with a wide range of energy stakeholders, the EU institutions and policy makers, ACER works closely with other European agencies through the EU Agencies Network (EUAN). See the EUAN work programme 2023-2024.

ACER’s role includes:

• Supporting the integration of energy markets in the EU (by common rules at EU level).
• Contributing to efficient trans-European energy infrastructure, ensuring alignment with EU priorities.
• Monitoring energy markets so that they function well, deterring wholesale energy market manipulation and abusive behaviour.
• Where necessary, coordinating cross-national regulatory action.

​Our overall purpose is achieving a transition of the European energy system in line with the political objectives set, reaping benefits of increased energy market integration across Europe, and securing low-carbon supply at least possible cost for European businesses and citizens.

The Agency promotes:

• a more competitive, integrated market, offering consumers more choice
• an efficient energy infrastructure and networks, enabling energy to move freely across borders, the integration of renewable sources, and therefore ensuring a higher degree of security of supply
• a monitored and transparent energy market guaranteeing consumers fair prices and a limitation of market abusive behaviours

Watch the video & discover what ACER does for you.