What is a significant hazard when dealing with downed power lines?

When dealing with downed power lines, a significant hazard is that they can still be energized, which poses an electrocution risk. Even when lines are down, they can retain electrical energy if they are not properly de-energized. This risk is present because electricity can travel through various materials, including water and the ground, increasing the danger to anyone who comes into close contact with the lines.

Additionally, it is critical for firefighters and first responders to be aware that the presence of downed lines may not be immediately obvious in terms of their electrical status. The potential for serious injury or fatality is very high if a person inadvertently touches or approaches an energized line. Awareness and caution are essential, and appropriate steps must be taken to ensure safety when responding to such incidents, including establishing a safe perimeter and waiting for utility professionals to secure the area.

The other options, while they may contain certain truths, do not present the primary hazard that electric shock from energized lines represents.