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Description
https://www.nordpoolgroup.com/en/trading/transition-to-15-minute-market-time-unit-mtu/
Spot prices are calculated on 15 minute intervals starting from 11.6.2025.
How to handle this on nordpool_diff depends on how exactly https://github.com/JaccoR/hass-entso-e and https://github.com/custom-components/nordpool shall handle this.