Which risk increases along high-voltage transmission lines during extreme solar flare activity?

💡 Explanation

When solar flares impact the Earth's magnetosphere, geomagnetically induced currents (GICs) flow through transmission lines because of rapid changes in the magnetic field, overwhelming transformer capacity, leading to saturation and potential damage. Therefore, transformer damage risk increases rather than conductor sagging, insulator flashover, or communications disruption, which require different electromagnetic conditions.

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