An unplanned 450 MW forced outage was recorded on ENTSO-E Transparency Platform at 06:02 UTC on 14 January 2026. Under Article 4.1 of REMIT Regulation 1227/2011, the responsible Market Participant was required to publish an Urgent Market Message to an authorised IIP within 60 minutes — by 07:00 UTC. No qualifying disclosure was found until 09:23 UTC, when a UMM was published on the EEX UMM Hub, 203 minutes after the outage was first observed. The 143-minute overshoot of the disclosure window, combined with the asset's MW output relative to the DE bidding zone's available generation capacity, yields a materiality score of 78.5.