In its 2025 report on cross-zonal electricity capacity and congestion management, the Agency for the Cooperation of Energy Regulators (ACER) points out that the electricity price peaks seen in the summer of 2024 in South-East Europe could have been avoided if the “70% rule” for network capacity had been respected.
This rule is a legal obligation for EU electricity transmission system operators (TSOs) - required by the 2019 Clean Energy Package - to make at least 70% of capacity available...