What is the opposite of electric?

If a lawn mower is powered by gas, that is the opposite of electric. If a girl you meet is one day electric and the next day the opposite she is listless or aloof or worse, boring. If it is Bob Dylan who has gone electric the opposite was acoustic. If Ed Begley Jr. doesn't drive a gas guzzling SUV it is because he drives electric. If you are cutting edge with your power then the opposite of electric is either solar or nuclear depending on your own tastes. AC/DC!