I'm an engineer with lots of experience in the power industry. In a situation like that, nobody should put their life in the hands of a cop who wouldn't know a power line from a TV cable line. The guy who gets out of the power company truck wearing the white hardhat is the only one whose word means anything in those situations.
Most utility companies have "bat phones" which connect the fire/police dispatch centers with the utility operations centers/radio rooms. The operations centers talk to each other constantly by radios and phones ensure no mistakes are made. I's called coordinated disaster planning, and it's been going on successfully for years, probably decades.
Police and fire departments receive regular training (usually from the utility companies themselves) on how to handle public safety situations involving electric utilities. If a policeman or fireman ever told a civilian to get out of the car without authorization from the utility, he would probably be severely disciplined or fired.