• State regulators ordered Edison to assess fire risks on 355 miles of unused transmission lines, including the century-old equipment suspected of igniting the Eaton fire.

• Edison must create a plan to address those idle lines, potentially including removal, marking the first major regulatory action related to electric infrastructure after the fire killed 19 people.

• Regulators are requiring other California utilities to take similar actions with their dormant transmission lines.

State regulators ordered Southern California Edison to identify fire risks on its unused transmission lines like the century-old equipment suspected of igniting the devastating Eaton wildfire.