Squirrels cause electrical disruptions when they chew on power lines, telephone wires, and other electrical equipment. The chewing on these items can damage the insulation, sending electric currents into the ground. This means that the electricity isn't going to the right places, so things like lights and TVs won't work. The disruptions can also cause electrical fires, so it's important to try to prevent squirrels from getting to these items. If a squirrel does chew on an electric line or equipment, homeowners or business owners should call an electrician or their power company.