It could may be stupid kids..but it could be a practice run for terrorists to one day hit a couple hundred similar places at once, across the country. All the more reason for the public to be well armed and alerted..
Stupid kids should be treated as such..repayment and time to be served in an appropriate facility. If it is adults and sabotage, they should be charged with attempted murder, since people sometimes die as a result of power outages. If somebody does die..they should be charged with murder, just as one who kills while committing a robbery.