ACER Decision 11/2026 formally rectifies the Core redispatching and countertrading cost-sharing methodology

The source confirms that ACER adopted Decision No 11/2026 on 21 July 2026, repealing Decision No 30/2020 and adopting a rectified Core redispatching and countertrading cost-sharing methodology. Compared with the prior event state, the material additional detail is the confirmed decision date and the decision’s specific remedial focus: expanded reasoning for retaining power-flow colouring as the flow-decomposition method, plus amendments to Article 7 and related Recital 8 concerning the loop-flow threshold.

The decision preserves the Core framework for allocating redispatching and countertrading costs of cross-border relevance while addressing the legal deficiencies identified in the remitted proceedings. The clarified decomposition and loop-flow treatment affect how congestion-causing flows are attributed for cost-sharing purposes among Core TSOs and bidding zones.

This is a regulatory rectification rather than a wholesale redesign of the cost-sharing architecture. The main design consequence is greater legal and methodological clarity around the attribution of internal, loop and allocated flows. By retaining power-flow colouring and tying it to the zonal market model and preceding capacity-calculation processes, the decision reinforces a causation-based allocation approach rather than changing day-ahead or intraday price formation directly.

Commission Regulation (EU) 2015/1222 (CACM Regulation), including Articles 9 and 74; Regulation (EU) 2019/943 (Electricity Regulation), including Article 16(13); Regulation (EU) 2019/942.

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