15.04.2026 - ACER Open Letter (REMIT 2)

REMIT Compliance April 15, 2026

ACER Open Letter on the Implications of Regulation (EU) 2026/256 for Data Reporting

Key Changes in REMIT Data Reporting – Deadlines, Formats, New Obligations

Overview of Changes

Objective of Regulation (EU) 2026/256: It concerns the implementation of Articles 7c(2), 8(1a), 8(2), and 8(6) of Regulation (EU) No 1227/2011, which governs the integrity and transparency of the wholesale energy market and replaces Regulation (EU) No 1348/2014.
Objective of the ACER Clarification: To familiarize market participants and other affected parties with the new reporting obligations and guide them toward timely implementation.

Key Deadlines and Requirements

Transition to New Reporting Obligations: Certain provisions take effect on April 29, 2026, while others have later application dates. Market participants must adapt to new reporting formats and deadlines, particularly regarding the transition to reporting on standardized and non-standardized contracts.
New Requirements for Market Participants: These include reporting obligations for exogenous data, hydrogen reporting, and transaction and lifecycle events. Certain market participants must register by April 29, 2027, to report their data correctly.
Reporting of Electricity and Gas Storage Transactions: Transactions related to electricity storage and LNG data will be reported in a new format starting in 2027.
New Reporting Deadlines:
- Standard contracts must be reported within two business days (T+2), and
  non-standardized contracts within ten business days (T+10).
- Additional requirements for exposure reports and lifecycle events are also included.
Transitional Periods and Backloading: ACER offers a transitional arrangement for the period from 2014 to 2026. Certain transactions must be reported retrospectively within 90 days following the transition.

Note:

ACER expects reporting parties to comply with the new reporting timeframes starting from April 29, 2026. This means that for transactions where the trade conclusion, order placement, auction end (gate closure), or lifecycle event occurs before April 29, 2026, the old reporting timeframes still apply.
For example, if a non-standard contract is concluded on April 28, 2026 (one day before the new REMIT IR comes into effect), the old one-month reporting timeframe still applies, and the transaction must be reported by May 28, 2026 at the latest.
However, if the transaction occurs on April 29, 2026, it must be reported by May 13, 2026 at the latest.

Impact on Hydrogen Reporting

Starting July 1, 2028, market participants active in the hydrogen market will be required to submit annual reports on their transactions. Further details will be published by the end of 2027.

ACER will continue to work with market participants and competent authorities to ensure a smooth transition to the new requirements and provide the necessary additional guidance.

Conclusion

The new rules under Regulation (EU) 2026/256 require a comprehensive adjustment of data reporting in the wholesale energy market. The most significant changes include the transition to new reporting formats and the introduction of additional reporting obligations for hydrogen and storage transactions. Market participants should prepare for the transitional periods and specific reporting requirements.

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Overview of Changes Key Deadlines and Requirements Impact on Hydrogen Reporting Conclusion