---
title: ACER Updates REMIT Reporting Guidance
description: Firms with REMIT inside information disclosure obligations should review their technical reporting and business processes immediately to identify any necessary adjustments. The transition to mandatory EIC codes and the strict requirements for UMM lifecycle updates may require system changes or staff training ahead of the December 2026 deadline.
image: https://www.regtrail.com/hubfs/RegTrail%20-%20Blog%20Images%20(5)-1.png
---
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# ACER Updates REMIT Reporting Guidance
RegTrail | 27 March, 2026
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On 26 March 2026, the pan-EU energy regulator ACER published updates to its Manual of Procedures (MoP) and related FAQs. These changes specifically target the reporting of inside information under Article 4 of REMIT.
This is the first update to this part of the MoP since April 2023 and the first to these FAQs since December 2024. These new versions represent a move towards aligning with future reporting requirements under the revised REMIT II Implementing Regulations, which are widely expected to be published soon.
Market participants have nine months to comply with this new guidance. The implementation deadline is December 2026.
#### **Key Changes to the MoP on Data Reporting**
The most significant updates appear in the track-changed Version 10 of the MoP. These revisions focus mainly on the “lifecycle” reporting of Urgent Market Messages (UMMs) and asset capacity reporting.
#### **FAQ Revisions**
The amended FAQs align with the MoP changes. They provide further detail on reporting "Dismissed" or "Inactive" statuses and clarify the distinction between event-specific unavailable capacity and total remaining available capacity.
#### **RegTrail Commentary**
Firms with REMIT inside information disclosure obligations should review their technical reporting and business processes immediately to identify any necessary adjustments. The transition to mandatory EIC codes and the strict requirements for UMM lifecycle updates may require system changes or staff training ahead of the December 2026 deadline.
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