Can a power supplier enter a property and remove the meter without a warrant and/or permission of the property owner, can the power company leave the property without a power supply?

If the meter is inside a building, permission would be needed to enter. Many states have laws prohibiting disconnection of utilities from residences in some / all times of the year under certain circumstances (children or elderly residing in the home). Commercial and industrial type buildings would not likely be subject to this type of protection. Keep in mind that the meter itself is the property of the electric company; obtaining a warrant to retrieve it wouldn't likely be difficult. You'd do well to speak to your lawyer for precise advice.