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=== Declining inertia causing difficulties in grid frequency management ===
The decline in inertia due to greater reliance on variable generation was mentioned as a possible factor in the 2025 European power outage concentrated in Spain and Portugal.[1] At the time of the start of the incident on the grid, 80% of power was being generated locally by solar and wind resources, and experts pointed out that a rapid frequency imbalance in the low inertia environment could have exacerbated or widened the blackout.[2]
