The European Union Agency for the Cooperation of Energy Regulators (ACER) has published its Consolidated Annual Activity Report for 2025, detailing its work on EU energy market integration, regulatory oversight, and consumer protection. The report, released on 30 June 2026, covers ACER's activities in 2025, including its role in monitoring wholesale energy markets, coordinating cross-border electricity and gas infrastructure, and implementing the EU's clean energy goals.
ACER's 2025 report highlights progress on key regulatory files, such as the revision of the REMIT implementing acts to enhance market transparency and the development of network codes for hydrogen and offshore renewable energy. The agency also conducted stress tests on gas supply security following the energy crisis, and issued opinions on national regulatory authorities' decisions on transmission tariffs. The report notes that ACER handled over 150 cases related to market manipulation and insider trading, and facilitated dispute resolution between national regulators and market participants.
The report underscores ACER's growing role in the EU's energy transition, particularly in integrating renewable energy sources and ensuring cross-border electricity flows. It also details the agency's budget execution and staffing, with a total of 140 staff members and a budget of €24 million for 2025. The report is addressed to the European Parliament, the Council, the European Commission, and the Court of Auditors, as part of ACER's annual accountability requirements.
Stakeholders impacted by ACER's 2025 activities include EU energy regulators, who benefit from coordinated guidelines but face increased reporting obligations; energy traders and power exchanges, which must comply with stricter market surveillance under REMIT; transmission system operators, which are affected by new network codes and tariff methodologies; and EU consumers, who gain from improved market transparency and security of supply, though costs of regulatory compliance may be passed through to end-users.
The report sets the stage for ACER's 2026 work programme, which will focus on implementing the revised Electricity Market Design and the hydrogen and decarbonised gas market package. The European Commission is expected to assess ACER's performance in its upcoming evaluation of EU energy agencies.