ACER
EU agency coordinating national energy regulators; holds direct REMIT enforcement powers since the 2024 revision.
ACER opened its REMIT transaction-reporting annex consultation on 16 July 2026, running to 11 September, the next step before its cross-border investigatory and sanctioning powers activate later this year.
Last refreshed: 3 August 2026 · Appears in 1 active topic
Has ACER's new enforcement mandate actually changed how EU energy markets are policed?
Timeline for ACER
Mentioned in: Two capitals filed on the gas directive
European Energy MarketsPublished the first EU-wide investment-cost dataset for generation and flexibility technologies
European Energy Markets: ACER issues first EU-wide cost datasetOpened public consultation on the REMIT transaction-reporting annex
European Energy Markets: ACER opens the REMIT reporting annexMentioned in: Berlin's 9 GW auctions await Brussels
European Energy MarketsMentioned in: StromVKG passes, bid ceiling up 41%
European Energy MarketsBackground
ACER is the EU agency that coordinates national energy regulators across the bloc's 27 member states plus Norway, Iceland and Liechtenstein. Established in 2009 under the EU's Third Energy Package and operational since 2011, it is headquartered in Ljubljana, Slovenia. Its REMIT covers market surveillance, technical standard-setting and cross-border infrastructure coordination, including the REMIT Quarterly, the Annual LNG Report, gas wholesale congestion reports and network-code opinions.
Under the 2019 REMIT II update and the 2024 REMIT amendments, ACER gained direct investigatory and sanctioning powers over energy market manipulation and insider trading; before 2024 it could only refer suspected cases to national regulators. That expansion turns ACER from a coordinating body into a cross-border enforcement authority, with national watchdogs still handling day-to-day supervision inside their own markets.
ACER also holds a formal role assessing infrastructure derogation requests from member states and issuing opinions to the European Commission, which retains final decision-making power. Its published reports are treated by the Commission and national industry as reference figures for EU energy-dependency and market-Integrity debates.
Its cross-border powers near activation
ACER opened its REMIT transaction-reporting annex consultation on 16 July, running to 11 September, the next step in embedding the cross-border investigatory and sanctioning powers it gained under the 2024 REMIT revision. The annex sets reporting scope for market participants, national regulators, Registered Reporting Mechanisms and organised marketplaces against Regulation (EU) 648/2012.
The annex follows ACER's 11 June workshop, where it confirmed the expanded powers activate in the second half of 2026, after logging 204 suspicious-transaction reports in 2025, double 2024's count. Firms will operate under interim guidance for close to two months before any final rulebook is fixed.
It maps where the TurkStream gap sits
ACER published opinions on 6 May covering derogation requests from seven national regulators on EU gas network codes at third-country entry points from 5 August 2026, naming Hungary and Slovakia, which together handle roughly 41 mcm/day of TurkStream flow. Final derogation decisions rest with the European Commission.
ACER's first monitoring report on the EU's Russian gas ban, published 1 July, found Russian gas still supplied 12% of EU demand in the report's window, with Russian LNG imports up 17% year-on-year; the ban targets only new short-term deals, leaving long-term contracts to run until 2027.
ACER opens its reporting consultation
What did ACER say about EU gas network congestion in 2026?
What is REMIT 2.0 and when did it come into force?
What share of EU LNG imports comes from the United States in 2026?
What is the Kiskundorozsma-1 interconnector dispute about?
What happened with the REMIT 2.0 reporting deadline in May 2026?
Why are Hungary and Slovakia named in ACER's TurkStream derogation list?
Which countries got ACER derogations from EU gas network codes in 2026?
Reference
Where is ACER headquartered and which countries does it cover?
Recently resolved
What is the compliance paradox in the April 2026 REMIT transition?
What are the new REMIT rules ACER confirmed in April 2026?
Has the EU's Russian gas import ban actually reduced Russian gas volumes?
Is ACER reviewing its own powers in 2026?
