An updated price algorithm fixes the undesired price spread, and the issue of unforeseeably rejected fully divisible bids. Effective from December 8th, 2025, manual price corrections and delayed price publication in the Nordic mFRR energy activation market will stop.
Undesired price spread has been an issue in the Nordic mFRR energy activation market, mFRR EAM, due to activation of indivisible mFRR bids on the price margin. In some instances, this has led to undesired determination of which bidding zones shall have the same price, i.e. the uncongested areas. In turn, this has in some cases led to high (or low for down-regulation) prices spreading to more areas than intended. In these areas, there have been issues with rejections of fully divisible unforeseeably bids, i.e. non-selected bids with better price than the clearing price. As a result, mFRR prices and imbalance prices may not always have accurately reflected the mFRR market situation in some MTUs.
Since February 2025, Nordic transmission system operators (TSOs) have been working to remove this problem by improving the mFRR EAM price algorithm. Read more in this news article: Pricing issue in Nordic mFRR EAM. The bid selection from the algorithm is correct and optimizes welfare as intended and is therefore not changed. Improvements to the algorithm focus solely on the price formation.
The updated version of the algorithm was successfully deployed on November 25th, 2025, after successful validation and verification during testing. Nordic TSOs will stop delaying publication and correcting prices effective from December 8th, 2025.