yes
Anytime you damage someone else's property it can be seen as illegal.
To do this, you will probably have to actually go on to their property. This is called trespassing. The act of turning someone's power off may not be illegal (provided you don't damage anything), however trespassing on their property to do it, is.
Propety Damage covers you if you damage someone elses property. Liability covers you in the event of a lawsuit.
call the police
Your own liability insurance will never pay for the damage to your property or for your medical expenses. Your collision insurance pays for damage to your property, if it is your fault. Your Uninsured Motorist Insurance or Underinsured Motorist Insurance pays for damage to your property if caused by someone else who is uninsured or under-insured. Your liability insurance will pay for the damage to someone else's property or for someone else's medical expenses, if it is your fault. Someone else's liability insurance will pay for the damage to your property or for your medical expenses, if it is their fault.
It means to have hurt someone.
destroyed or damaged something that isn't your property
If it is relative to an auto insurance policy, it for property damage caused to someone else's property. You or someone in control of your vehicle causes damage to anothers property, could be another vehicle, or some other type of property. ( personal liability/property damage) Coll would mean damage to your vehicle due to collision, and Comp would mean your comprehensive coverage for your vehicle for damage due to things like hitting a deer, or hail damage for example.
Liability would only cover the insured for his damage to the property of someone else. Your insurance will have to cover the damage to his truck.
Torts deal with damage to property and persons. Wrongful death is a tort case that can be brought when someone dies because of something someone else did wrong. It is different then criminal law.
Property damage liability insurance is to cover the damage you may cause to someone else's property. Different states have different car insurance requirements and regulations. Further, some people get larger property liability insurance coverage than the minimum requirements.
You may cause an accident, injure yourself or someone else, cause damage to property or end up with a traffic violation.