On 21 July 2026, the European Union Agency for the Cooperation of Energy Regulators (ACER) adopted Decision No 11/2026, establishing a revised methodology for cost sharing of redispatching and countertrading in the Core capacity calculation region (CCR). The decision replaces the previous methodology adopted in 2020, following an appeal process that upheld the original decision. The new methodology aims to ensure fair and efficient allocation of costs incurred by transmission system operators (TSOs) when they adjust generation or load to manage congestion, impacting electricity producers, TSOs, and consumers across the Core region.
The decision was issued after Core TSOs submitted a proposal under Article 74 of the CACM Regulation (EU 2015/1222), which regulatory authorities failed to agree on by March 2020. ACER initially adopted a methodology in Decision No 30/2020, which was appealed by French and German regulators (CRE and BNetzA) and five TSOs (TransnetBW, TenneT TSO GmbH, TenneT TSO BV, PSE, and RTE). The ACER Board of Appeal dismissed the appeals on 28 May 2021, confirming the validity of the original methodology. The new Decision No 11/2026 updates the methodology, incorporating lessons from implementation and ensuring compliance with the CACM Regulation.
The methodology sets out principles for sharing costs of redispatching and countertrading actions taken to relieve physical congestion on the grid. It defines how costs are allocated among TSOs in the Core CCR, which covers central and eastern Europe. The decision is based on consultations with regulatory authorities, TSOs, and ACER's Electricity Working Group, and received a favourable opinion from the Board of Regulators on 8 July 2026.
TSOs in the Core CCR will face revised cost allocation rules, potentially altering their financial exposure from congestion management. Electricity producers may see changes in compensation for redispatch orders. National regulatory authorities gain a harmonised framework, reducing disputes. Consumers could benefit from more efficient grid operation, though cost pass-through may affect electricity prices. The decision balances operational efficiency with fair cost distribution, avoiding disproportionate burdens on any single TSO or member state.