# ACER – European Union Agency for the Cooperation of Energy Regulators – knowledge base (public website acer.europa.eu)

Source note: gathered from public pages of https://www.acer.europa.eu/ (fetched 28 Oct 2026). Public information only.

## About ACER (https://www.acer.europa.eu/the-agency/about-acer)
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 European 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. ACER works closely with other European agencies through the EU Agencies Network (EUAN).
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.
What does the Agency do for you? The 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 a higher degree of security of supply; a monitored and transparent energy market guaranteeing consumers fair prices and a limitation of market abusive behaviours.
Contact: Trg republike 3, 1000 Ljubljana, Slovenia. Tel. +386 (0) 8 205 34 00. E-mail info(at)acer.europa.eu.

## About REMIT (https://www.acer.europa.eu/remit/about-remit)
The Regulation on Wholesale Energy Market Integrity and Transparency (REMIT) is the EU framework that protects wholesale energy markets from abuse, ensuring open and fair competition. REMIT prohibits two main forms of market abuse: insider trading (using undisclosed information to gain unfair advantage) and market manipulation (distorting market integrity or creating false or misleading market signals).
Since its adoption in 2011, REMIT was revised in 2024: broader scope (energy storage, hydrogen, electricity balancing and financial instruments); better alignment with the Union's financial market rules; ACER investigatory powers in cross-border cases (two or more Member States). REMIT enforcement continues to be at national level.
How REMIT works: prohibiting abusive practices; ensuring transparency (companies must publish 'inside information', such as planned outages or capacity changes); mandating data reporting (market participants report trading data so national regulators and ACER can monitor).
Anyone (including citizens) can notify a potential REMIT breach or suspicious behaviour through ACER's REMIT Notification Platform.
What market participants and organised market places need to do:
1. Registration: market participants (e.g. energy traders, TSOs) register with their national energy regulator. Organised market places (OMPs) notify ACER to be included on a dedicated list. Third-country participants active on EU energy markets must designate an EU representative.
2. Reporting and disclosure: report wholesale energy transactions through registered reporting mechanisms (RRMs) and publish inside information promptly through inside information platforms (IIPs).
3. ACER authorises and supervises IIPs and RRMs. With the revised REMIT it is mandatory to use IIPs for disclosure of inside information. There are over 100 RRMs; authorisation is only available to RRMs founded within the EU.
4. Oversight and enforcement: ACER collects and analyses EU-wide market data; NRAs monitor, investigate and sanction at national level; ACER cooperates with NRAs and investigates cross-border cases.
ACER's main REMIT activities: collecting and analysing market data; monitoring wholesale markets; notifying manipulative behaviour to national regulators; investigating cross-border cases; transparency tools (REMIT Data Reference Centre, Inside Information Access Point, LNG price assessments); promoting fair price formation; guidance (open letters, REMIT Guidance, Q&As).

## Careers at ACER (https://www.acer.europa.eu/the-agency/careers)
ACER is a decentralised EU agency located in Ljubljana. Working for ACER means a multicultural environment working towards a single energy market for all EU consumers. Core values: cooperating, delivering quality results, communicating, problem solving, being service oriented, knowledge sharing, welcoming diversity. ACER offers regular feedback and training, private health insurance and welfare and recreation activities (e.g. Pilates and yoga, football and fitness, cultural activities, Away Days, ergonomic consulting, psychological support, confidential counsellors). Ljubljana was European Green Capital 2016.

## Home page highlights (https://www.acer.europa.eu/)
Topics featured: European retail markets for electricity and gas; tracking remaining Russian gas contracts during the phase-out of Russian gas imports; decarbonising the gas market; cross-zonal capacity and flexibility in Southeast Europe. Quick links: Report suspicious behaviour (REMIT Notification Platform); ACER Electricity and Gas Information System; procurement calls; events (e.g. webinar 17.11.2026 on assessing EU-wide flexibility needs).