Data Reporting

This REMIT Data Reporting section outlines how ACER collects data.

Under REMIT, data reporting entities are required to submit data to ACER in line with the data reporting obligations set out in secondary legislation (REMIT Implementing Regulation 1348/2014, updated in 2026).

By harmonising and standardising reporting across the EU, this centralised framework supports effective market monitoring and promotes transparency and integrity in wholesale energy markets.

The main data reporting entities under REMIT are ‘market participants’ and ‘Organised Market Places’ (OMPs), which submit data through:

• Registered Reporting Mechanisms (RRMs) for wholesale energy transactions (trades and orders to trade) and exposures; or
• Inside Information Platforms (IIPs) for 'inside information'.

To comply with their data reporting obligations, market participants must first register on the European register through the national regulatory authority (NRA) of the country where they operate.

Once registered, market participants choose the appropriate reporting entity depending on the type of data to report (IIPs for insider information, RRMs for transactions and exposures). These reporting entities then transmit the data in standardised formats to ACER via its ARIS Data Collection Interface (DCI).

Market participants that want to report directly as RRMs may apply for authorisation via ACER's Centralised European Register of Energy Market Participants (CEREMP) platform.

See the document ‘REMIT data: What to report and how’ for details on what data to report, how and when (e.g. frequency, timeframes, channels). This also covers new obligations introduced by the revised Implementing Regulation (2026), such as ‘exposure’ reporting of market participants’ trading positions.

What are ‘market participants’, ‘OMPs’, ‘RRMs’ and ‘IIPs’?

• Market participants are persons or companies trading on EU wholesale markets, including non-EU/EEA entities.
• Organised Market Places (OMPs) are platforms where multiple buyers or sellers interact to trade energy products (such as energy exchanges, brokers and capacity platforms).
• Registered Reporting Mechanisms (RRMs) are entities that have been authorised by ACER to report REMIT data to ACER on their own behalf (their own data) or to report data on behalf of other parties (as a service). The list of RRMs is made publicly available by ACER (see the list of approved RRMs). Authorisation is only available to RRMs that were founded within the European Union.
• Inside Information Platforms (IIPs) are internet-based platforms where market participants have to publish  information they believe fall under the ‘inside information’ definition. With the revised REMIT, IIPs have the obligation to report to ACER the inside information data disclosed on their platform, and have to undergo an authorisation process defined in the Delegated Act for the RRMs and IIPs authorisation and supervision For further details on RRMs and IIPs and the related authorisation process, see the Registrations and Authorisations section.

Among the REMIT actors involved in the data reporting, a specific role is also assigned to the ENTSOs in the REMIT Implementing Regulation.

ENTSOs: The European Network of Transmission System Operators for Electricity (ENTSO-E) and Gas (ENTSOG) report the ‘fundamental data’ on transmission systems (e.g. generation capacity, grid availability, cross-border electricity transmission capacity, gas pipeline capacity and flows, storage levels, outages, LNG terminal use).

ACER has two main systems to collect and manage energy market data:

• ACER REMIT Information System (ARIS). This is the central hub for all data submission, used to collect and share REMIT-related data submitted by reporting entities (RRMs, IIPs, ENTSOs). 
• ​ACER Electricity and Gas Information System (AEGIS). This platform supports ACER’s wider data management tasks (beyond REMIT). Within AEGIS, the TERMINAL application is used to collect LNG market data and publish the LNG price assessment and benchmark. From October 2027, market participants will report LNG market data via registered reporting mechanisms, instead of through TERMINAL.

ACER provides guidance to help reporting parties understand how to submit REMIT data (transaction data, exposures and fundamental data), including the electronic formats to use.

The guidance documents are updated periodically (in consultation with stakeholders). They are available in the REMIT Reporting Guidance section of the REMIT Documents page. The REMIT Knowledge Base can also be searched by keyword to navigate withing the different guidance documents.